GMC Sierra Classic 3500 2007 - 2007 GENERAL MOTORS Sierra Classic & Silverado Classic

GMC Sierra Classic 3500 2007 - BUZZERS, RELAYS & TIMERS

GMC Sierra Classic 3500 2007 BUZZERS, RELAYS & TIMERS LOCATION

Component	Location
A/C COMP Relay	In underhood fuse block. See Fig. 14.
AUX HEATER PMP Relay	In secondary underhood fuse block. See Fig. 15.
Auxiliary Battery Relay	At right rear of engine compartment. See Fig. 18.
Auxiliary Battery Relay Electrical Connector	Right rear of engine compartment. See Fig. 18.
DRIVER UNLOCK Relay	In I/P fuse block.
DRL Relay	In underhood fuse block. See Fig. 14.
FOG LP Relay	In underhood fuse block. See Fig. 14.
F/PMP Relay	In underhood fuse block. See Fig. 14.
Fuel Pump Relay (Secondary)	On underhood fuse block bracket. See Fig. 55.
HDLP-HI Relay	In underhood fuse block. See Fig. 14.
HDLP-LOW Relay	In underhood fuse block. See Fig. 14.
HORN Relay	In underhood fuse block. See Fig. 14.
IGN 1 Relay	In underhood fuse block. See Fig. 14.
LOCK Relay	In I/P fuse block.
PARK LP Relay	In underhood fuse block. See Fig. 14.
Power Take Off (PTO) Relay	Near underhood fuse block. See Fig. 69.
PWR MAINT Relay	In secondary underhood fuse block. See Fig. 15.
Rear Defog Relay	In instrument panel relay block. See Fig. 17.
Roof Beacon Relay	At lower left "B" pillar.
RR FOG LP Relay	In I/P fuse block.
SGCM COOL PMP/FAN Relay	In secondary underhood fuse block. See Fig. 15.
Spare Relay	In I/P relay block. See Fig. 17.
STARTER Relay	In underhood fuse block. See Fig. 14.
TRANS PMP Relay	In secondary underhood fuse block. See Fig. 15.
UNLOCK Relay	In I/P fuse block.
W/S WASH Relay	In underhood fuse block. See Fig. 14.

GMC Sierra Classic 3500 2007 - CIRCUIT PROTECTION DEVICES

GMC Sierra Classic 3500 2007 CIRCUIT PROTECTION DEVICES LOCATION

Component	Location
Energy Storage Box (ESB)	Under rear passenger seat.
Fuse Block - I/P	On lower left side of dash. See Fig. 71.
Fuse Block - Mobile Radio	Right side of dash.
Fuse Block - Underhood	At left side of engine compartment. See Fig. 69.
Fuse Block - Underhood Cooling Fan (10 Series)	Left side of engine compartment, rear of battery.
Fuse Block - Underhood Secondary (HP2)	Left side of engine compartment, rear of battery.
Fusible Link 1 (Diesel)	In battery cable harness, approximately 18 cm from junction block.
Fusible Link 1 (4.3L)	In battery cable harness, approximately 18 cm from junction block.
Fusible Link 1 (4.8L, 5.3L & 6.0L)	In battery cable harness connected to junction block.
Fusible Link 1 (8.1L)	In battery cable harness, approximately 18 cm from junction block.
Fusible Link 2 (Diesel)	In battery cable harness, connected to junction block battery cable.
Fusible Link 3 (Diesel)	At glow plug control module (GPCM) connector.
Fusible Link 4	In accessory jumper harness, approximately 50 cm from ring terminal of mega fuse holder.
Fusible Link 5	In auxiliary battery cable harness, approximately 18 cm from relay ring terminal.
Fusible Link 6	In auxiliary battery cable harness, approximately 18 cm from auxiliary battery relay.
I/P Relay Block	Near left kick panel. See Fig. 73.
Junction Block - I/P	Right side of dash, behind access panel.
Junction Block - Rear Lamps	Inside left frame rail, near rear of vehicle.

GMC Sierra Classic 3500 2007 - CONTROL UNITS

GMC Sierra Classic 3500 2007 CONTROL UNITS LOCATION

Component	Location
Blower Motor Control Processor	Near blower motor, on HVAC assembly. See Fig. 23.
Body Control Module	On lower left side of dash, below steering column. See Fig. 71.
Body Control Module (BCM) Connectors	On body control module. See Fig. 72.
Cruise Control Module	In left rear of engine compartment. See Fig. 67.
Cruise Control Module Electrical Connector	On cruise control module. See Fig. 67.
Driver Door Module (DDM)	In driver's door. See Fig. 74.
Electronic Brake Control Module (EBCM)	On left side of inner frame. See Fig. 9.
Energy Storage Control Module (ESCM)	In energy storage box. See Fig. 11.
Engine Control Module (ECM) (6.6L)	At left front of engine compartment. See Fig. 53.
Flasher Module	On bottom of instrument panel fuse block. See Fig. 16.
Front Passenger Door Module (FPDM)	In right front door. See Fig. 75.
Generator Battery Control Module	Left front corner of engine compartment, on battery negative cable.
HVAC Control Module	In center of dash. See Fig. 21.
Ignition Control Module (ICM) (4.3L)	On right front of intake manifold. See Fig. 102.
Inflatable Restraint I/P Module	Behind right side of dash.
Inflatable Restraint Passenger Presence System (PPS) Module	Below right front seat. See Fig. 64.
Inflatable Restraint Sensing And Diagnostic Module (SDM)	Under left front seat. See Fig. 10.
Memory Seat Module	Underside of left front seat. See Fig. 81.
Powertrain Control Module (PCM) (4.3L, 4.8L, 5.3L, 6.0L)	Left front of engine compartment. See Fig. 49.
Powertrain Control Module (PCM) (8.1L)	Left front of engine compartment. See Fig. 103.
Starter/Generator Control Module (Hybrid)	Right rear of engine compartment. See Fig. 3.
Throttle Actuator Control (TAC) Module (4.8L, 5.3L, 6.0L & 8.1L)	At left rear of engine compartment. See Fig. 46.
Tire Pressure Monitor (TPM) Module	Behind dash above brake pedal assembly.
Transfer Case Shift Control Module	Behind headlamp switch. See Fig. 32.
Transmission Control Module (Allison)	Left front of engine compartment. See Fig. 104.
Transmission Control Module (TCM) (6.6L)	At left front of engine compartment. See Fig. 53.
Transmission Control Module (TCM) (8.1L)	At left front of engine compartment. See Fig. 103.
Vehicle Communication Interface Module (VCIM)	Behind passenger air bag module.
Windshield Wiper Motor Module	Under windshield cowl, between wiper arms. See Fig. 85.

GMC Sierra Classic 3500 2007 - MOTORS

GMC Sierra Classic 3500 2007 MOTORS LOCATION

Component	Location
Air Temperature Actuator (Left)	At bottom center of HVAC control assembly. See Fig. 23.
Air Temperature Actuator (Right)	At top center of HVAC control assembly. See Fig. 22.
A/T Shift Lock Control Actuator	On steering column. See Fig. 62.
Blower Motor	Below right side of dash. See Fig. 23.
Cooling Fan - Left	Left front of engine compartment.
Cooling Fan - Right	Right front of engine compartment.
Electro Hydraulic Power Steering (EHPS) Module Assembly	Left front of engine. See Fig. 4.
Energy Storage Box (ESB) Cooling Fan	In energy storage box. See Fig. 11.
Front Axle Actuator Connector (1500 Series)	On front axle actuator. See Fig. 31.
Front Axle Actuator Connector (2500 Series)	On front axle actuator. See Fig. 30.
Front Axle Actuator (1500 Series)	On front axle. See Fig. 31.
Front Axle Actuator (2500 Series)	On axle housing. See Fig. 30.
Fuel Pump And Sender Assembly (Primary) (20/30 Series)	On top of primary fuel tank. See Fig. 105.
Fuel Pump And Sender Assembly (Secondary) (20/30 Series)	On top of secondary fuel tank. See Fig. 105.
Fuel Pump And Sender Assembly (10 Series)	In fuel tank. See Fig. 8.
Fuel Pump (6.6L)	In left side frame rail. See Fig. 52.
Ignition Lock Cylinder Control Actuator	On steering column. See Fig. 70.
Mode Actuator	On left side of HVAC module. See Fig. 22.
Recirculation Actuator	On top center of HVAC module. See Fig. 22.
Seat Bolster Motor (Driver)	In driver's seat back. See Fig. 82.
Seat Front Vertical Motor (Driver)	Below driver's seat. See Fig. 81.
Seat Front Vertical Motor (Front Passenger)	Below right front seat. See Fig. 64.
Seat Horizontal Motor (Driver)	Below driver's seat. See Fig. 81.
Seat Horizontal Motor (Front Passenger)	Below right front seat. See Fig. 64.
Seat Lumbar Motor (Driver)	In driver's seat back. See Fig. 82.
Seat Rear Vertical Motor (Driver)	Below driver's seat. See Fig. 81.
Seat Rear Vertical Motor (Front Passenger)	Below right front seat. See Fig. 64.
Seat Recliner Motor (Driver)	Below driver's seat. See Fig. 81.
Seat Recliner Motor (Front Passenger)	Below right front seat. See Fig. 64.
Starter (4.3L, 4.8L, 5.3L & 6.0L)	Lower right side of engine. See Fig. 1.
Starter (6.6L)	Lower right side of engine. See Fig. 93.
Starter (8.1L)	Lower right side of engine. See Fig. 106.
Supplemental Brake Assist Pump Motor	Mounted to power brake booster. See Fig. 38.
Transfer Case Encoder Motor (NVG 246-NP8)	Left side of transfer case. See Fig. 33.
Transfer Case Encoder Motor (NVG 263-NP1)	Left side of transfer case. See Fig. 35.
Window Motor (Driver)	In driver's door. See Fig. 74.
Window Motor (Front Passenger)	In right front door. See Fig. 75.
Window Motor (Left Rear)	In left rear door. See Fig. 76.
Window Motor (Right Rear)	In right rear door. See Fig. 77.
Windshield Washer Fluid Pump	In washer fluid pump. See Fig. 85.

GMC Sierra Classic 3500 2007 - SENDING UNITS & SENSORS

GMC Sierra Classic 3500 2007 SENDING UNITS & SENSORS LOCATION

Component	Location
Accelerator Pedal Position (APP) Sensor (4.8L, 5.3L, 6.0L & 8.1L)	Driver's floor board, above accelerator pedal. See Fig. 57.
A/C Refrigerant Pressure Sensor (4.3L)	On A/C high pressure hose. See Fig. 19.
A/C Refrigerant Pressure Sensor (4.8L, 5.3L, 6.0L & 8.1L)	On A/C high pressure hose. See Fig. 107.
A/C Refrigerant Pressure Sensor (6.6L)	On A/C high pressure hose. See Fig. 108.
Air Temperature Sensor Assembly (Inside)	In headliner, above driver.
Air Temperature Sensor Connector (Lower Right)	On lower right air temperature sensor. See Fig. 23.
Air Temperature Sensor Connector (Upper Left)	On upper left air temperature sensor. See Fig. 24.
Air Temperature Sensor Connector (Upper Right)	On upper right air temperature sensor. See Fig. 24.
Air Temperature Sensor (Lower Left)	In lower left floor duct assembly. See Fig. 25.
Air Temperature Sensor (Lower Right)	At bottom center of HVAC box, in floor duct. See Fig. 26.
Air Temperature Sensor (Upper Left)	Upper left side of dash. See Fig. 24.
Air Temperature Sensor (Upper Right)	Upper right side of dash. See Fig. 24.
Ambient Air Temperature Sensor	In right front bumper filler assembly. See Fig. 20.
Ambient Light Sensor	On top center of dash. See Fig. 79.
Ambient Light/Sunload Sensor Assembly	On top center of dash.
Automatic Transmission Fluid Temperature Sensor	In automatic transmission.
Automatic Transmission Input Shaft Speed Sensor	In automatic transmission.
Automatic Transmission Turbine Speed Sensor	In upper left of transmission.
Battery Temperature Sensor 1	In energy storage box. See Fig. 11.
Battery Temperature Sensor 2	In battery storage box. See Fig. 11.
Battery Temperature Sensor 3	In energy storage box. See Fig. 11.
Camshaft Position (CMP) Sensor (4.3L)	In distributor. See Fig. 2.
Camshaft Position (CMP) Sensor (4.3L)	Rear of engine. See Fig. 2.
Camshaft Position (CMP) Sensor (4.8L, 5.3L & 6.0L)	On top center rear of engine. See Fig. 44.
Camshaft Position (CMP) Sensor (6.6L)	On front of engine, near cooling fan pulley. See Fig. 93.
Camshaft Position (CMP) Sensor (8.1L)	On left side of timing cover. See Fig. 56.
Camshaft Position Sensor (8.1L)	On left side of timing cover. See Fig. 56.
Crankshaft Position (CKP) Sensor Connector (4.3L)	Near bottom of crankshaft pulley. See Fig. 1.
Crankshaft Position (CKP) Sensor (4.3L)	On bottom front of engine, near crank pulley. See Fig. 41.
Crankshaft Position (CKP) Sensor (4.8L, 5.3L & 6.0L)	On lower right rear of engine block.
Crankshaft Position (CKP) Sensor (6.6L)	On right side of engine front cover. See Fig. 93.
Crankshaft Position (CKP) Sensor (8.1L)	Behind left valve cover. See Fig. 106.
Current Sensor (Hybrid)	In energy storage box. See Fig. 11.
ECT Sensor (6.6L)	On top front of engine. See Fig. 51.
Engine Coolant Temperature (ECT) Sensor Connector (4.8L, 5.3L & 6.0L)	Front left side of engine.
Engine Coolant Temperature (ECT) Sensor (4.3L)	On rear side of left cylinder head. See Fig. 102.
Engine Coolant Temperature (ECT) Sensor (4.8L, 5.3L & 6.0L)	On front side of left cylinder head. See Fig. 43.
Engine Coolant Temperature (ECT) Sensor (8.1L)	At middle of right cylinder head. See Fig. 106.
Engine Oil Pressure (EOP) Sensor Connector (8.1L)	Left rear of engine.
Engine Oil Pressure (EOP) Sensor (4.3L)	Left rear of engine. See Fig. 2.
Engine Oil Pressure (EOP) Sensor (4.8L, 5.3L & 6.0L)	Top rear of engine. See Fig. 44.
Engine Oil Pressure (EOP) Sensor (6.6L)	On left rear side of engine block. See Fig. 92.
Engine Oil Pressure (EOP) Sensor (8.1L)	On top rear of engine. See Fig. 106.
Fuel Level Sensor (Primary)	In primary fuel tank.
Fuel Level Sensor (Secondary)	In secondary fuel tank.
Fuel Pump And Sender Assembly (Primary) (20/30 Series)	In primary fuel tank. See Fig. 105.
Fuel Pump And Sender Assembly (Secondary) (20/30 Series)	In secondary fuel tank. See Fig. 105.
Fuel Pump And Sender Assembly (10 Series)	On fuel tank. See Fig. 8.
Fuel Rail Pressure (FRP) Sensor (6.6L)	Under intake manifold shield, on fuel rail. See Fig. 109.
Fuel Rail Temperature (FRT) Sensor (6.6L)	Top left side of engine. See Fig. 109.
Fuel Tank Pressure Sensor	On fuel tank, integral to fuel pump & sender assembly.
Heated Oxygen (HO2S) Sensor Bank 1 Sensor 1 (4.8L & 5.3L)	In left exhaust pipe, before catalytic converter. See Fig. 47.
Heated Oxygen (HO2S) Sensor Bank 1 Sensor 1 (6.0L & 8.1L)	In left exhaust pipe, before catalytic converter. See Fig. 48.
Heated Oxygen (HO2S) Sensor Bank 1 Sensor 2 (4.8L & 5.3L)	In left exhaust pipe, after catalytic converter. See Fig. 47.
Heated Oxygen (HO2S) Sensor Bank 1 Sensor 2 (6.0L & 8.1L)	In left exhaust pipe, after catalytic converter. See Fig. 48.
Heated Oxygen (HO2S) Sensor Bank 2 Sensor 1 (4.8L & 5.3L)	In right exhaust pipe, before catalytic converter. See Fig. 47.
Heated Oxygen (HO2S) Sensor Bank 2 Sensor 1 (6.0L & 8.1L)	In right exhaust pipe, before catalytic converter. See Fig. 48.
Heated Oxygen (HO2S) Sensor Bank 2 Sensor 2 (4.8L & 5.3L)	In right exhaust pipe, after catalytic converter. See Fig. 47.
Heated Oxygen (HO2S) Sensor Bank 2 Sensor 2 (6.0L & 8.1L)	In right exhaust pipe, after catalytic converter. See Fig. 48.
Inflatable Restraint Front End Sensor (HVY)	On bottom of radiator support. See Fig. 65.
Inflatable Restraint Front End Sensor (Left) (W/O HVY)	On left front of vehicle. See Fig. 65.
Inflatable Restraint Front End Sensor (Right) (W/O HVY)	On right front of vehicle. See Fig. 65.
Inflatable Restraint Passenger Presence System (PPS) Sensor	Below right front seat. See Fig. 64.
Intake Air Temperature (IAT) Sensor 2 (6.6L)	In air induction tube. See Fig. 109.
Knock Sensor (KS) Bank 1 (8.1L)	Left side of engine. See Fig. 56.
Knock Sensor (KS) (Bank 2) (8.1L)	On right side of engine, forward of starter. See Fig. 106.
Knock Sensor (KS) Bank 2 (8.1L)	On right side of engine. See Fig. 106.
Knock Sensor (KS) 1 (4.8L, 5.3L & 6.0L)	Under intake manifold. See Fig. 45.
Knock Sensor (KS) 2 (4.8L, 5.3L & 6.0L)	Under intake manifold. See Fig. 45.
Knock Sensor (KS) (4.3L)	Left rear of engine. See Fig. 2.
Manifold Absolute Pressure (MAP) Sensor (4.3L)	On top of intake manifold. See Fig. 41.
Manifold Absolute Pressure (MAP) Sensor (4.8L, 5.3L & 6.0L)	On top rear of engine, on intake manifold. See Fig. 110.
Manifold Absolute Pressure (MAP) Sensor (6.6L)	Mounted to intake air tube in front of intake air heater (IAH) module. See Fig. 109.
Manifold Absolute Pressure (MAP) Sensor (8.1L)	On top rear of engine, on intake manifold. See Fig. 106.
Mass Air Flow (MAF)/Intake Air Temperature Sensor (6.6L)	Between air cleaner assembly & throttle body. See Fig. 50.
Mass Air Flow (MAF) Sensor	Right side of engine compartment. See Fig. 18.
Passlock Sensor	On steering column. See Fig. 70.
Propshaft Speed Sensor (Front)	On left front side of transfer case. See Fig. 33.
Propshaft Speed Sensor (Rear)	On transfer case extension housing. See Fig. 33.
Steering Wheel Speed/Position Sensor	On steering column. See Fig. 28.
Sunload Sensor Assembly	Top of instrument panel. See Fig. 27.
Throttle Position (TP) Sensor Connector (8.1L)	On throttle position sensor.
Throttle Position (TP) Sensor (4.3L)	On throttle body assembly. See Fig. 102.
Tire Pressure Monitor (TPM) Sensor (Left Front)	Inside left front tire.
Tire Pressure Monitor (TPM) Sensor (Left Rear)	Inside left rear tire.
Tire Pressure Monitor (TPM) Sensor (Right Front)	Inside right front tire.
Tire Pressure Monitor (TPM) Sensor (Right Rear)	Inside right rear tire.
Tire Pressure Monitor (TPM) Sensor (Spare)	Inside spare tire.
Vehicle Speed Connector (NV 4500)	Left side of transmission. See Fig. 60.
Vehicle Speed Sensor (NV 3500)	On left rear side of transmission. See Fig. 58.
Vehicle Speed Sensor (VSS) (NVG 261-NP2)	On left side of transfer case. See Fig. 29.
Vehicle Speed Sensor (VSS) (NVG 263-NP1)	On left rear of transfer case. See Fig. 35.
Vehicle Speed Sensor (ZF S6-650)	Left rear of transmission. See Fig. 61.
Vehicle Speed Sensor (4L60-E)	Right rear of transmission. See Fig. 63.
Voltage Sensor (Hybrid)	In energy storage box. See Fig. 11.
Water In Fuel Sensor (6.6L)	On fuel filter element. See Fig. 54.
Wheel Speed Sensor (Right Front) (2WD)	On right front wheel hub assembly. See Fig. 39.
Wheel Speed Sensor (Right Front) (4WD)	On right front hub assembly. See Fig. 40.

GMC Sierra Classic 3500 2007 - SOLENOIDS & SOLENOID VALVES

GMC Sierra Classic 3500 2007 SOLENOIDS & SOLENOID VALVES LOCATION

Component	Location
A/C Compressor Clutch (4.3L)	On A/C compressor. See Fig. 19.
A/C Compressor Clutch (4.8L, 5.3L, 6.0L & 8.1L)	On A/C compressor. See Fig. 107.
A/C Compressor Clutch (6.6L)	On A/C compressor. See Fig. 108.
Evaporative Emission (EVAP) Canister Purge Solenoid (4.3L)	At right side of engine, attached to intake manifold. See Fig. 41.
Evaporative Emissions (EVAP) Canister Purge Solenoid Valve (8.1L)	Left side of throttle body, near left of engine. See Fig. 56.
Evaporative Emissions (EVAP) Canister Purge Solenoid (4.8L, 5.3L & 6.0L)	Behind throttle body, near front of engine. See Fig. 110.
Evaporative Emissions (EVAP) Canister Vent Solenoid (10 Series)	On rear of fuel tank. See Fig. 8.
Evaporative Emissions (EVAP) Canister Vent Solenoid (20/30 Series)	On right front side of primary fuel tank. See Fig. 105.
Exhaust Gas Recirculation (EGR) Valve (6.6L)	On right side of engine. See Fig. 109.
Fuel Injector 1 (4.8L, 5.3L & 6.0L)	Left front of engine. See Fig. 43.
Fuel Injector 1 (6.6L)	Right side of engine. See Fig. 93.
Fuel Injector 1 (8.1L)	Left side of engine. See Fig. 56.
Fuel Injector 2 Connector (4.8L, 5.3L & 6.0L)	Right side of engine. See Fig. 111.
Fuel Injector 2 (6.6L)	Left side of engine. See Fig. 92.
Fuel Injector 2 (8.1L)	Right side of engine. See Fig. 106.
Fuel Injector 3 (4.8L, 5.3L & 6.0L)	Left side of engine. See Fig. 43.
Fuel Injector 3 (6.6L)	Right side of engine. See Fig. 93.
Fuel Injector 3 (8.1L)	Left side of engine. See Fig. 56.
Fuel Injector 4 (4.8L, 5.3L & 6.0L)	Right side of engine. See Fig. 111.
Fuel Injector 4 (6.6L)	Left side of engine. See Fig. 92.
Fuel Injector 4 (8.1L)	Right side of engine. See Fig. 106.
Fuel Injector 5 (4.8L, 5.3L & 6.0L)	Left side of engine. See Fig. 43.
Fuel Injector 5 (6.6L)	Right side of engine. See Fig. 93.
Fuel Injector 5 (8.1L)	Left side of engine. See Fig. 56.
Fuel Injector 6 (4.8L, 5.3L & 6.0L)	Right side of engine. See Fig. 111.
Fuel Injector 6 (6.6L)	Left side of engine. See Fig. 92.
Fuel Injector 6 (8.1L)	Right side of engine. See Fig. 106.
Fuel Injector 7 (4.8L, 5.3L & 6.0L)	Left rear of engine. See Fig. 43.
Fuel Injector 7 (6.6L)	Right side of engine. See Fig. 93.
Fuel Injector 7 (8.1L)	Left side of engine. See Fig. 56.
Fuel Injector 8 (4.8L, 5.3L & 6.0L)	Right side of engine. See Fig. 111.
Fuel Injector 8 (6.6L)	Left side of engine. See Fig. 92.
Fuel Injector 8 (8.1L)	Right side of engine. See Fig. 106.
Idle Air Control (IAC) Valve (4.3L)	Mounted to throttle body. See Fig. 102.
Mod Main Pressure Control Solenoid	In automatic transmission assembly.
Pressure Control (PC) Solenoid Valve	In automatic transmission. See Fig. 63.
Shock Absorber Solenoid (Left Front)	Part of left front shock.
Shock Absorber Solenoid (Left Rear)	Part of left rear shock.
Shock Absorber Solenoid (Right Front)	Part of right front shock.
Shock Absorber Solenoid (Right Rear)	Part of right rear shock.
Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve (4L60-E)	In automatic transmission. See Fig. 63.
Torque Converter Clutch (TCC) Solenoid Valve (4L60-E)	In automatic transmission. See Fig. 63.
1-2 Shift Solenoid (SS) Valve (4L60-E)	In automatic transmission. See Fig. 63.
2-3 Shift Solenoid (SS) Valve (4L60-E)	In automatic transmission. See Fig. 63.
3-2 Shift Solenoid (SS) Valve (4L60-E)	In automatic transmission. See Fig. 63.

GMC Sierra Classic 3500 2007 - SWITCHES

GMC Sierra Classic 3500 2007 SWITCHES LOCATION

Component	Location
A/C Low Pressure Switch	On right side of accumulator. See Fig. 18.
Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch (4L60-E)	In automatic transmission. See Fig. 63.
Back-Up Lamp Switch (NV 3500)	On left side of transmission. See Fig. 58.
Back-Up Lamp Switch (NV 4500)	Left side of transmission. See Fig. 60.
Back-Up Lamp Switch (ZF S6-650)	Right rear of transmission. See Fig. 61.
Brake Fluid Level Switch	On left side of brake fluid reservoir. See Fig. 37.
Brake Fluid Level Switch Connector	On brake fluid level switch. See Fig. 37.
Brake Pressure Differential Switch	In brake line under master cylinder.
Clutch Start Switch	On top of clutch pedal assembly. See Fig. 59.
Coolant Level Switch	In coolant reservoir.
Coolant Level Switch Connector	Right rear of engine compartment. See Fig. 18.
Door Jamb Switch (Mini Wedge) Connectors (Left Rear)	Rear of left rear door. See Fig. 76.
Door Jamb Switch (Mini Wedge) Connectors (Right Rear)	Rear of right rear door. See Fig. 77.
Door Jamb Switch (Mini Wedge) (Driver)	Rear of driver's door. See Fig. 74.
Door Jamb Switch (Mini Wedge) (Front Passenger)	Rear of right front door. See Fig. 75.
Engine Oil Level Switch Connector (4.8L, 5.3L & 6.0L)	On right side of oil pan. See Fig. 112.
Engine Oil Level Switch (6.6L)	On left rear of oil pan. See Fig. 92.
Ignition Key Alarm Switch	On steering column. See Fig. 70.
Inflatable Restraint Seat Position Switch (Right)	Below right front seat. See Fig. 64.
Park Brake Switch	Part of park brake assembly.
Park/Neutral Position (PNP) Switch	On left side of transmission.
Pressure Switch Manifold	In automatic transmission.
Seat Belt Switch Connector (Driver)	On side of driver's seat. See Fig. 82.
Service Disconnect Switch (Hybrid)	On energy storage box. See Fig. 11.
Stoplamp Switch	On top of brake pedal bracket. See Fig. 36.
Transfer Case Shift Control Switch Connector	On top of transfer case. See Fig. 29.
Washer Fluid Level Switch	On washer fluid reservoir. See Fig. 85.

GMC Sierra Classic 3500 2007 - MISCELLANEOUS

GMC Sierra Classic 3500 2007 MISCELLANEOUS LOCATION

Component	Location
Accessory Power Receptacle Connector	Right side of energy storage box. See Fig. 101.
Accessory Power Receptacle Harness.	Right side of vehicle. See Fig. 101.
Audio Amplifier	Under rear of center console.
Back-Up Alarm	At rear bumper.
Battery 1 (Hybrid)	In energy storage box. See Fig. 11.
Battery 2 (Hybrid)	In energy storage box. See Fig. 11.
Battery 3 (Hybrid)	In energy storage box. See Fig. 11.
Cellular Microphone	In overhead console. See Fig. 66.
Cellular & Navigation Antenna	On roof, near left "A" pillar.
Central Sequential Fuel Injection (Central CFI) (4.3L)	On top of engine. See Fig. 102.
Data Link Connector	Under left side of dash, below steering column. See Fig. 72.
Digital Radio Receiver	Behind right side of instrument panel. See Fig. 68.
Electro Hydraulic Power Steering (EHPS) Module Assembly	Left front of engine. See Fig. 4.
Energy Storage Box (ESB)	Under rear passenger seat.
Fuel Heater (6.6L)	On top of fuel filter element.
Generator (Auxiliary)	Left side of engine. See Fig. 42.
Generator (Primary)	Right side of engine. See Fig. 42.
Heated Seat Element (Driver Cushion)	In driver's seat cushion. See Fig. 82.
Horn-High Note (Uplevel)	Right side of radiator support. See Fig. 78.
Horn-Low Note	Left side of radiator support. See Fig. 78.
Ignition Coil 1 (4.8L, 5.3L & 6.0L)	Left side of engine. See Fig. 43.
Ignition Coil 1 (8.1L)	On top of left valve cover. See Fig. 56.
Ignition Coil 2 (4.8L, 5.3L & 6.0L)	Right side of engine. See Fig. 111.
Ignition Coil 2 (8.1L)	On top of right valve cover. See Fig. 106.
Ignition Coil 3 (4.8L, 5.3L & 6.0L)	Left side of engine. See Fig. 43.
Ignition Coil 3 (8.1L)	On top of left valve cover. See Fig. 56.
Ignition Coil (4.3L)	On top right side of engine. See Fig. 41.
Ignition Coil 4 (4.8L, 5.3L & 6.0L)	Right side of engine. See Fig. 111.
Ignition Coil 4 (8.1L)	On top of right valve cover. See Fig. 106.
Ignition Coil 5 (4.8L, 5.3L & 6.0L)	Left side of engine. See Fig. 43.
Ignition Coil 5 (8.1L)	On top of left valve cover. See Fig. 56.
Ignition Coil 6 (4.8L, 5.3L & 6.0L)	Right side of engine. See Fig. 111.
Ignition Coil 6 (8.1L)	On top of right valve cover. See Fig. 106.
Ignition Coil 7 (4.8L, 5.3L & 6.0L)	Left side of engine. See Fig. 43.
Ignition Coil 7 (8.1L)	On top of left valve cover. See Fig. 56.
Ignition Coil 8 (4.8L, 5.3L & 6.0L)	Right side of engine. See Fig. 111.
Ignition Coil 8 (8.1L)	On top of right valve cover. See Fig. 106.
Inflatable Restraint Steering Wheel Module	On steering wheel. See Fig. 70.
Intake Air Heater (IAH) Module (6.6L)	Under intake manifold sight shield, inside air intake pipe. See Fig. 109.
Rear EPTO Outlet Connector	Near right rear frame rail. See Fig. 13.
Trailer Wiring Connector	Rear of vehicle. See Fig. 80.
Trailer Wiring Receptacle	Rear of vehicle. See Fig. 80.

GMC Sierra Classic 3500 2007 - CONNECTORS

GMC Sierra Classic 3500 2007 CONNECTORS LOCATION

Component	Location
C100 (Black, 16 Pin)	Below underhood fuse block. See Fig. 88.
C102 (Black, 10 Pin)	Below underhood fuse block. See Fig. 88.
C104 (Black, 12 Pin)	Front side of fuse block.
C105 (Black, 10 Pin)	Near underhood fuse block.
C107 (6.6L) (Black, 38 Pin)	On top of left valve cover.
C108 (6.6L) (Black, 24 Pin)	On top of left valve cover.
C110 (Black, 3 Pin)	On top center of engine.
C111 (Black, 4 Pin)	On right rear corner of engine.
C113 (Black, 6 Pin)	On top of engine, next to intake manifold.
C115 (Black, 2 Pin)	On top center of manifold.
C116 (Black, 24 Pin)	Attached to underhood fuse block.
C117 (Black, 2 Pin)	Left rear of engine compartment. See Fig. 86.
C118 (Black, 1 Pin)	At starter/generator control module, at right rear of engine compartment.
C119 (Black, 2 Pin)	Left rear of engine compartment. See Fig. 87.
C120 (Black, 6 Pin)	On front side of underhood fuse block.
C121 (Hybrid) (Black, 1 Pin)	In 42 volt harness, under coolant reservoir. See Fig. 3.
C122 (Hybrid) (Black, 1 Pin)	In 42 volt harness, under coolant reservoir. See Fig. 3.
C125 (Light Gray, 8 Pin)	On radiator support.
C127 (Light Gray, 8 Pin)	On radiator support.
C148 (Light Gray, 8 Pin)	On top left side of engine. See Fig. 91.
C149 (Light Gray, 8 Pin)	On top right side of engine. See Fig. 96.
C150 (Black, 4 Pin)	On left inner fender. See Fig. 34.
C151 (Black, 12 Pin)	On left inner fender.
C152 (Blue, 12 Pin)	Below underhood fuse block. See Fig. 88.
C153 (4.3L) (Black, 3 Pin)	On left inner fender. See Fig. 90.
C154 (Black, 3 Pin)	On left inner fender.
C155 (8.1L) (Black, 10 Pin)	Near left top front of engine. See Fig. 94.
C160 (5XY/5Y0) (Black, 2 Pin)	Left rear of engine compartment. See Fig. 86.
C160 (5Y0) (Black, 2 Pin)	Left rear of engine compartment. See Fig. 87.
C161 (5Y0) (Black, 1 Pin)	Left rear of engine compartment. See Fig. 87.
C180 (Black, 2 Pin)	Under underhood fuse block.
C201 (Black, 32 Pin)	On steering column. See Fig. 28.
C202 (Black, 12 Pin)	Behind left side of dash.
C206 (Light Gray, 22 Pin)	Behind left kick panel.
C210 (Black, 2 Pin)	Behind left side of dash. See Fig. 73.
C214 (Black, 16 Pin)	Behind upper left side of dash.
C220 (Gray, 24 Pin)	Behind center of dash.
C221 (Yellow, 4 Pin)	Behind left kick panel.
C222 (Yellow, 4 Pin)	Behind right kick panel.
C223 (Black, 16 Pin)	Behind left kick panel.
C230 (Black, 2 Pin)	Behind upper right side of dash.
C249 (Black, 4 Pin)	Behind center of dash.
C250 (Gray, 6 Pin)	Behind left side of dash.
C305 (Black, 16 Pin)	Under left front seat.
C306 (Black, 40 Pin)	Under front floor console.
C310 (Black, 17 Pin)	At left "B" pillar. See Fig. 76.
C320 (Light Gray, 13 Pin)	Under left front seat. See Fig. 81.
C321 (Blue, 24 Pin)	Under left front seat. See Fig. 81.
C322 (Natural, 10 Pin)	Under left front seat. See Fig. 81.
C323 (Black, 6 Pin)	Under left front seat. See Fig. 81.
C324 (Black, 8 Pin)	Under left front seat. See Fig. 82.
C325 (Gray, 6 Pin)	Under left front seat. See Fig. 81.
C326 (Gray, 6 Pin)	Under right front seat. See Fig. 83.
C329 (Gray, 4 Pin)	Under right front seat. See Fig. 84.
C350 (Black, 2 Pin)	At top of transfer case. See Fig. 29.
C355 (W/O Universal Garage Door Opener) (6 Pin)	Under front over head console.
C355 (W/ Universal Garage Door Opener) (3 Pin)	Under front overhead console.
C388 (Black, 6 Pin)	Under right front seat. See Fig. 83.
C396 (Black, 17 Pin)	At right "B" pillar.
C399 (Black, 16 Pin)	Under right front seat.
C404 (Black, 2 Pin)	Under rear bumper.
C405 (Black, 2 Pin)	Under rear bumper.
C428 (Black, 7 Pin)	At rear of vehicle, behind center of rear bumper, near spare tire.
C429 (Black, 1 Pin)	At rear of vehicle, behind center of rear bumper, near spare tire.

GMC Sierra Classic 3500 2007 - GROUNDS

GMC Sierra Classic 3500 2007 GROUNDS LOCATION

Component	Location
G100	On lower left radiator support. See Fig. 3.
G102 (4.3L)	On lower right front of engine block. See Fig. 1.
G102 (4.8L, 5.3L, 6.0L & 8.1L)	On left side of engine block.
G102 (6.6L)	On right side of engine block.
G103	On right rear of engine block.
G104 (4.3L, 4.8L, 5.3L & 6.0L)	On left rear of engine block.
G104 (6.6L)	Lower left side of engine.
G104 (8.1L)	Left rear of engine block.
G105 (Hybrid)	At lower rear of engine compartment. See Fig. 3.
G105 (4.3L)	On lower right front of engine block. See Fig. 1.
G106	On right front of engine block.
G107	Ground strap from engine to frame rail.
G108 (6.6L)	Lower left side of engine.
G109 (6.6L)	On right side of engine block.
G110 (1500 Series)	On left front body mount. See Fig. 31.
G110 (2500 Series)	On left front body mount. See Fig. 30.
G115	On lower right of radiator support.
G120 (Hybrid)	Right rear of engine compartment. See Fig. 3.
G121 (Hybrid)	Front of right cylinder head.
G122 (Hybrid)	Left front of engine. See Fig. 4.
G200	Behind right side of dash, near right "A" pillar. See Fig. 5.
G203	Behind left side of dash, near left "A" pillar. See Fig. 6.
G302 (W/ Heavy Duty)	On left side body mount.
G302 (W/O Heavy Duty)	On left front body mount. See Fig. 7.
G304	Under right front seat.
G305	On left "B" pillar.
G306	On right "B" pillar.
G310 (Hybrid)	In energy storage box. See Fig. 11.
G311 (Hybrid)	In energy storage box. See Fig. 11.
G390	Near "C" pillar.
G401	On spare tire hoist bracket. See Fig. 12.
G403	On left rear body mount.
G405	On right rear frame rail. See Fig. 13.

GMC Sierra Classic 3500 2007 - SPLICES

GMC Sierra Classic 3500 2007 SPLICES LOCATION

Component	Location
SP205	In I/P harness. See Fig. 72.
SP207	Left kick panel.
SP250	Near HVAC control module.
S100	In forward lamp harness.
S101	In forward lamp harness.
S102 (4.3L)	In engine harness. See Fig. 89.
S102 (4.8L, 5.3L & 6.0L)	In engine harness. See Fig. 112.
S102 (8.1L)	In engine harness. See Fig. 94.
S103 (4.3L)	In engine harness. See Fig. 89.
S103 (8.1L)	In engine harness. See Fig. 94.
S104	In engine harness. See Fig. 91.
S110 (4.3L)	In engine harness. See Fig. 90.
S110 (8.1L)	In engine harness. See Fig. 95.
S118	In engine harness.
S119	In engine harness.
S120	In the 42V harness. See Fig. 101.
S121	In the 42V harness. See Fig. 101.
S122 (6.6L)	In engine harness approximately 9 cm (3.54 in) from ECM connector.
S123 (8.1L)	In engine harness approximately 20 cm (7.78 in) from PCM connector.
S127	In engine harness.
S132 (8.1L)	In engine harness. See Fig. 94.
S135	Inside transmission assembly.
S136	Inside transmission assembly.
S150	In engine harness.
S151 (8.1L)	In ignition coil jumper harness. See Fig. 94.
S152	In injector jumper harness.
S153	In ignition coil jumper harness.
S154	In injector jumper harness.
S156	In engine harness.
S157 (4.8L, 5.3L, & 6.0L)	In engine harness approximately 4 cm (1.57 in) before C149 breakout.
S157 (8.1L)	In engine harness. See Fig. 96.
S159	In ignition coil jumper harness.
S160 (8.1L)	In ignition coil jumper harness. See Fig. 96.
S163 (8.1L)	In engine harness. See Fig. 94.
S164	In engine harness.
S164 (8.1L)	In engine harness. See Fig. 94.
S165 (8.1L)	In engine harness. See Fig. 95.
S166	In forward lamp harness, approximately 5 cm (1.97 in)from C104 breakout.
S167 (6.6L)	In engine harness, approximately 11.43 cm (4.5 in) from fuel heater connector breakout.
S181	In engine harness.
S182	In engine harness.
S200	At roof marker lights.
S201	At roof marker lights.
S202	In I/P harness. See Fig. 99.
S205	In I/P harness. See Fig. 100.
S206	In I/P harness.
S207	In headliner harness.
S210	In I/P harness. See Fig. 100.
S212	In I/P harness. See Fig. 100.
S213	In I/P harness. See Fig. 99.
S214	In I/P harness. See Fig. 99.
S215	In brake clutch harness.
S216	In steering column harness.
S217	In steering column harness.
S218	In I/P harness. See Fig. 100.
S219	In brake clutch harness.
S220	In SEO harness. See Fig. 97.
S221	In SEO harness. See Fig. 98.
S222	In SEO harness. See Fig. 98.
S223	In SEO harness. See Fig. 97.
S240	In steering column harness.
S241	In steering column harness.
S260	In steering wheel controls harness.
S301	In console harness.
S303	In console harness, approximately 11.5 cm (4.52 in) before C306 breakout.
S307	In console harness.
S309	In driver seat harness.
S310	In driver seat harness.
S311	In driver seat harness.
S314	In driver seat harness.
S315	In driver seat harness.
S326	In the 42V harness. See Fig. 101.
S328	In passenger seat harness.
S329	In passenger seat harness.
S330	In accessory power receptacle harness. See Fig. 101.
S331	In accessory power receptacle harness. See Fig. 101.
S331	In accessory power receptacle harness. See Fig. 101.
S333	In console harness.
S335	In dash, approximately 6.4 cm (2.56 in) from C202 breakout.
S351	In sunroof harness.
S408	In left rear lamp harness.
S412	In camper/5th wheel harness.
S413	In camper/5th wheel harness.
S414	In camper/5th wheel harness 24 cm (9.44 in) from trailer connector breakout.
S415	In camper/5th wheel harness 37 cm (14.6 in) from trailer connector breakout.
S416	In camper/5th wheel harness 18.5 cm (7.28 in)from trailer connector breakout.
S417	In camper/5th wheel harness 45.5 cm (18 in) from trailer connector breakout.
S418	In camper/5th wheel harness 30.5 cm (12 in) from trailer connector breakout.
S420	In license lamp harness.
S430	In the 120V harness. See Fig. 101.
S431	In pigtail of EPTO outlet attached to truck bed.