Chevrolet Silverado 2500 1999 - 1999 GENERAL MOTORS Sierra & Silverado

Chevrolet Silverado 2500 1999 - BUZZERS, RELAYS & TIMERS

Chevrolet Silverado 2500 1999 BUZZERS, RELAYS & TIMERS

Component	Component Location
A/C Compressor Clutch Relay	In underhood bussed electrical center.
Air Injection Reaction Relay	In underhood fuse/relay center.
Auxiliary Battery Relay	On right side of A/C accumulator, attached to firewall.
Blower Motor Relay	On HVAC module, near blower motor.
Brake Lamp Relay	In underhood fuse/relay center.
Courtesy Lamp Relay	In mid bussed electrical center.
Daytime Running Lamp (DRL) Relay	In underhood bussed electrical center.
Door Lock Relay	In right bussed electrical center.
Door Unlock Relay	In right bussed electrical center.
Driver Unlock Relay	In left bussed electrical center.
Fog Lamp Relay	In underhood bussed electrical center.
Fuel Pump Balance Relay (6.5L VIN F)	On fuel pump balance module.
Fuel Pump Balance Relay (6.5L VIN S)	On fuel pump balance module.
Fuel Pump Relay	In underhood bussed electrical center.
Glow Plug Relay (6.5L VIN F)	On top left rear of engine. See Fig. 8 .
Glow Plug Relay (6.5L VIN S)	On top left rear of engine. See Fig. 8 .
Headlamp Relay	In underhood bussed electrical center.
Heated Seat Relay	In respective seat.
Horn Relay	In underhood bussed electrical center.
Ignition Relay	In underhood bussed electrical center.
Inadvertent Power Relay	In mid bussed electrical center.
Lock Relay	In left bussed electrical center.
Parklamp Relay	In mid bussed electrical center.
Power Amplifier Relay	Behind center of dash.
Power Window Up Relay	In right window switch.
Rear Window Defogger Relay	In underhood bussed electrical center.
Retained Accessory Power Relay	In left bussed electrical center.
Roof Beacon Relay	Near left "B" pillar.
Secondary Air Injection Reaction Pump Relay	In underhood bussed electrical center.
Spot Lamp Relay	Behind dash, near convenience center.
Starter Relay	In underhood bussed electrical center.
Stoplamp Relay	In underhood fuse/relay center.
Transfer Case Relay	In engine compartment, on right side of firewall.
Turn/Hazard Flasher	In left bussed electrical center.
Unlock Relay	In left bussed electrical center.

Chevrolet Silverado 2500 1999 - CIRCUIT PROTECTION DEVICES

Chevrolet Silverado 2500 1999 CIRCUIT PROTECTION DEVICES

Component	Component Location
Auxiliary Power Center	Center of dash, below heater controls.
Left Bussed Electrical Center	On lower left side of dash.
Mid Bussed Electrical Center	Under left side of dash, near left kick panel.
Power Seats Circuit Breaker	In left bussed electrical center.
Power Window Circuit Breaker	In left bussed electrical center.
Right Bussed Electrical Center	On lower right side of dash.
Underhood Bussed Electrical Center	On left side of engine compartment. See Fig. 15 .

Chevrolet Silverado 2500 1999 - CONTROL UNITS

Chevrolet Silverado 2500 1999 CONTROL UNITS

Component	Component Location
Automatic Transfer Case Control Module	Left side of dash, above headlight switch.
Body Control Module	On lower left side of dash, below steering column.
Cruise Control Module	In left rear of engine compartment, on firewall.
Electronic Brake Control Module (EBCM)	On left side of inner frame.
Fuel Solenoid Driver (6.5L VIN F)	On left side of fuel injection pump. See Fig. 13 .
Fuel Solenoid Driver (6.5L VIN S)	On left side of fuel injection pump. See Fig. 13 .
HVAC Control Module	In center of dash under radio.
Ignition Control Module (4.3L VIN W)	On right side top of engine, at ignition coil.
Inflatable Restraint I/P Module	On right side of dash.
Inflatable Restraint Sensing & Diagnostic Module	Under driver's seat.
Memory Seat Module	On underside of driver's seat.
Powertrain Control Module (PCM) (4.8L VIN V)	On left front of engine compartment. See Fig. 15 .
Powertrain Control Module (PCM) (5.3L VIN T)	On left front of engine compartment. See Fig. 15 .
Powertrain Control Module (PCM) (6.0L VIN U)	On left front of engine compartment. See Fig. 15 .
Vehicle Control Module (VCM) (4.3L VIN W)	On left front of engine compartment. See Fig. 15 .

Chevrolet Silverado 2500 1999 - MOTORS

Chevrolet Silverado 2500 1999 MOTORS

Component	Component Location
Blower Motor	Under right side of dash.
Encoder Motor	Inside of transfer case.
Fuel Injection Pump (6.5L VIN F)	On top front of engine. See Fig. 13 .
Fuel Injection Pump (6.5L VIN S)	On top front of engine. See Fig. 13 .
Fuel Pump (4.3L VIN W)	In fuel tank.
Fuel Pump (4.8L VIN V)	In fuel tank.
Fuel Pump (5.3L VIN T)	In fuel tank.
Fuel Pump (6.0L VIN U)	In fuel tank.
Mode Door Motor	On left side of HVAC module.
Recirculation Door Motor	On top center of HVAC module.
Secondary Air Injection Reaction Pump	On right rear of engine compartment. See Fig. 14 .
Temperature Door Motor	Near bottom center of HVAC module.
Windshield Washer Pump	In washer fluid reservoir.

Chevrolet Silverado 2500 1999 - SENDING UNITS & SENSORS

Chevrolet Silverado 2500 1999 SENDING UNITS & SENSORS

Component	Component Location
Ambient Light Sensor	On top center of dash.
Boost Pressure Sensor (6.5L VIN F)	On top center of engine. See Fig. 8 .
Boost Pressure Sensor (6.5L VIN S)	On top center of engine. See Fig. 8 .
Camshaft Position (CMP) Sensor (4.3L VIN W)	In distributor.
Camshaft Position (CMP) Sensor (4.8L VIN V)	On top center rear of engine.
Camshaft Position (CMP) Sensor (5.3L VIN T)	On top center rear of engine.
Camshaft Position (CMP) Sensor (6.0L VIN U)	On top center rear of engine.
Crankshaft Position (CKP) Sensor (4.3L VIN W)	On bottom front of engine, near crank pulley. See Fig. 2 .
Crankshaft Position (CKP) Sensor (4.8L VIN V)	On lower right rear of engine block. See Fig. 7 .
Crankshaft Position (CKP) Sensor (5.3L VIN T)	On lower right rear of engine block. See Fig. 7 .
Crankshaft Position (CKP) Sensor (6.0L VIN U)	On lower right rear of engine block. See Fig. 7 .
Crankshaft Position (CKP) Sensor (6.5L VIN F)	On bottom front of engine, near crank pulley. See Fig. 11 .
Crankshaft Position (CKP) Sensor (6.5L VIN S)	On bottom front of engine, near crank pulley. See Fig. 11 .
Engine Coolant Temperature (ECT) Sensor (4.3L VIN W)	On left rear side of cylinder head. See Fig. 3 .
Engine Coolant Temperature (ECT) Sensor (4.8L VIN V)	On left front side of cylinder head. See Fig. 5 .
Engine Coolant Temperature (ECT) Sensor (5.3L VIN T)	On left front side of cylinder head. See Fig. 5 .
Engine Coolant Temperature (ECT) Sensor (6.0L VIN U)	On left front side of cylinder head. See Fig. 5 .
Engine Coolant Temperature (ECT) Sensor (6.5L VIN F)	On top right front of engine, near thermostat housing.
Engine Coolant Temperature (ECT) Sensor (6.5L VIN S)	On top right front of engine, near thermostat housing.
Engine Oil Temperature Sensor (4.8L VIN V)	On left side of oil pan. See Fig. 5 .
Engine Oil Temperature Sensor (5.3L VIN T)	On left side of oil pan. See Fig. 5 .
Engine Oil Temperature Sensor (6.0L VIN U)	On left side of oil pan. See Fig. 5 .
Front Propshaft Speed Sensor	On left side of transfer case at shaft output.
Fuel Pump/Level Sensor	In fuel tank.
Fuel Tank Pressure Sensor	In fuel tank.
Heated Oxygen Sensor (HO2S) (Bank 1 Sensor 1) (4.3L VIN W)	In left exhaust pipe before catalytic converter.
Heated Oxygen Sensor (HO2S) (Bank 1 Sensor 1) (4.8L VIN V)	In left exhaust pipe before catalytic converter.
Heated Oxygen Sensor (HO2S) (Bank 1 Sensor 1) (5.3L VIN T)	In left exhaust pipe before catalytic converter.
Heated Oxygen Sensor (HO2S) (Bank 1 Sensor 1) (6.0L VIN U)	In left exhaust pipe before catalytic converter.
Heated Oxygen Sensor (HO2S) (Bank 1 Sensor 2) (4.3L VIN W)	In left exhaust pipe after catalytic converter.
Heated Oxygen Sensor (HO2S) (Bank 1 Sensor 2) (4.8L VIN V)	In left exhaust pipe after catalytic converter.
Heated Oxygen Sensor (HO2S) (Bank 1 Sensor 2) (5.3L VIN T)	In left exhaust pipe after catalytic converter.
Heated Oxygen Sensor (HO2S) (Bank 1 Sensor 2) (6.0L VIN U)	In left exhaust pipe after catalytic converter.
Heated Oxygen Sensor (HO2S) (Bank 2 Sensor 1) (4.3L VIN W)	In right exhaust pipe before catalytic converter.
Heated Oxygen Sensor (HO2S) (Bank 2 Sensor 1) (4.8L VIN V)	In right exhaust pipe before catalytic converter.
Heated Oxygen Sensor (HO2S) (Bank 2 Sensor 1) (5.3L VIN T)	In right exhaust pipe before catalytic converter.
Heated Oxygen Sensor (HO2S) (Bank 2 Sensor 1) (6.0L VIN U)	In right exhaust pipe before catalytic converter.
Heated Oxygen Sensor (HO2S) (Bank 2 Sensor 2) (4.3L VIN W)	In right exhaust pipe after catalytic converter.
Heated Oxygen Sensor (HO2S) (Bank 2 Sensor 2) (4.8L VIN V)	In right exhaust pipe after catalytic converter.
Heated Oxygen Sensor (HO2S) (Bank 2 Sensor 2) (5.3L VIN T)	In right exhaust pipe after catalytic converter.
Heated Oxygen Sensor (HO2S) (Bank 2 Sensor 2) (6.0L VIN U)	In right exhaust pipe after catalytic converter.
Inflatable Restraint Front End Discriminating Sensor	On underside of radiator support.
Intake Air Temperature (IAT) Sensor (4.3L VIN W)	Part of mass airflow sensor.
Intake Air Temperature (IAT) Sensor (4.8L VIN V)	Part of mass airflow sensor.
Intake Air Temperature (IAT) Sensor (5.3L VIN T)	Part of mass airflow sensor.
Intake Air Temperature (IAT) Sensor (6.0L VIN U)	Part of mass airflow sensor.
Intake Air Temperature (IAT) Sensor (6.5L VIN F)	On top of engine, near intake manifold opening. See Fig. 9 .
Intake Air Temperature (IAT) Sensor (6.5L VIN S)	On top of engine, near intake manifold opening. See Fig. 9 .
Knock Sensor (KS) (4.3L VIN W)	On rear of engine block. See Fig. 1 .
Knock Sensors (KS) (4.8L VIN V)	In valley under intake manifold. See Fig. 6 .
Knock Sensors (KS) (5.3L VIN T)	In valley under intake manifold. See Fig. 6 .
Knock Sensors (KS) (6.0L VIN U)	In valley under intake manifold. See Fig. 6 .
Manifold Absolute Pressure (MAP) Sensor (4.3L VIN W)	On top right of engine, near fuel injectors. See Fig. 4 .
Manifold Absolute Pressure (MAP) Sensor (4.8L VIN V)	On top rear of engine on intake manifold. See Fig. 5 .
Manifold Absolute Pressure (MAP) Sensor (5.3L VIN T)	On top rear of engine on intake manifold. See Fig. 5 .
Manifold Absolute Pressure (MAP) Sensor (6.0L VIN U)	On top rear of engine on intake manifold. See Fig. 5 .
Manifold Absolute Pressure (MAP) Sensor (6.5L VIN F)	On top middle of radiator support.
Manifold Absolute Pressure (MAP) Sensor (6.5L VIN S)	On top middle of radiator support.
Mass Airflow (MAF) Sensor	In air intake duct.
Optical/Fuel Temperature Sensor (6.5L VIN F)	On top of fuel injection pump. See Fig. 13 .
Optical/Fuel Temperature Sensor (6.5L VIN S)	On top of fuel injection pump. See Fig. 13 .
Passlock Sensor	Part of ignition cylinder.
Remote Control Door Lock Sensor	Top center of dash, near instrument cluster.
Throttle Position (TP) Sensor (4.3L VIN W)	On throttle body assembly. See Fig. 1 .
Throttle Position (TP) Sensor (4.8L VIN V)	On throttle body assembly. See Fig. 5 .
Throttle Position (TP) Sensor (5.3L VIN T)	On throttle body assembly. See Fig. 5 .
Throttle Position (TP) Sensor (6.0L VIN U)	On throttle body assembly. See Fig. 5 .
Vehicle Speed Sensor	On left rear side of transmission.
Water-In-Fuel Sensor (6.5L VIN F)	On fuel filter/manager. See Fig. 12 .
Water-In-Fuel Sensor (6.5L VIN S)	On fuel filter/manager. See Fig. 12 .
Wheel Speed Sensors (Front) (2)	On left & right front wheel hub assembly.

Chevrolet Silverado 2500 1999 - SOLENOIDS & SOLENOID VALVES

Chevrolet Silverado 2500 1999 SOLENOIDS & SOLENOID VALVES

Component	Component Location
Brake Transmission Shift Interlock Solenoid	On lower part of steering column.
CDR Valve (6.5L VIN F)	On right side of engine. See Fig. 8 .
CDR Valve (6.5L VIN S)	On right side of engine. See Fig. 8 .
Engine Shutoff Solenoid (6.5L VIN F)	On top of fuel injection pump. See Fig. 13 .
Engine Shutoff Solenoid (6.5L VIN S)	On top of fuel injection pump. See Fig. 13 .
Evaporative Emissions (EVAP) Canister Purge Valve (4.3L VIN W)	On top right rear of engine. See Fig. 1 .
Evaporative Emissions (EVAP) Canister Purge Valve (4.8L VIN V)	On top right rear of engine. See Fig. 5 .
Evaporative Emissions (EVAP) Canister Purge Valve (5.3L VIN T)	On top right rear of engine. See Fig. 5 .
Evaporative Emissions (EVAP) Canister Purge Valve (6.0L VIN U)	On top right rear of engine. See Fig. 5 .
Evaporative Emissions (EVAP) Canister Vent Valve	On right front side of engine.
Exhaust Gas Recirculation (EGR) Solenoid (6.5L VIN F)	On top left rear of engine. See Fig. 8 .
Exhaust Gas Recirculation (EGR) Solenoid (6.5L VIN S)	On top left rear of engine. See Fig. 8 .
Exhaust Gas Recirculation (EGR) Valve (4.3L VIN W)	On top front of engine, near thermostat housing. See Fig. 4 .
Exhaust Gas Recirculation (EGR) Valve (4.8L VIN V)	On top right front of engine.
Exhaust Gas Recirculation (EGR) Valve (5.3L VIN T)	On top right front of engine.
Exhaust Gas Recirculation (EGR) Valve (6.0L VIN U)	On top right front of engine.
Exhaust Gas Recirculation (EGR) Valve (6.5L VIN F)	On top center of engine. See Fig. 8 .
Exhaust Gas Recirculation (EGR) Valve (6.5L VIN S)	On top center of engine. See Fig. 8 .
Exhaust Gas Recirculation (EGR) Vent Solenoid (6.5L VIN F)	On top left rear of engine. See Fig. 8 .
Exhaust Gas Recirculation (EGR) Vent Solenoid (6.5L VIN S)	On top left rear of engine. See Fig. 8 .
Fuel Solenoid (6.5L VIN F)	On rear of fuel injection pump. See Fig. 13 .
Fuel Solenoid (6.5L VIN S)	On rear of fuel injection pump. See Fig. 13 .
Idle Air Control (IAC) Valve (4.3L VIN W)	Attached to right rear of throttle body. See Fig. 1 .
Idle Air Control (IAC) Valve (4.8L VIN V)	Attached to top of throttle body. See Fig. 5 .
Idle Air Control (IAC) Valve (5.3L VIN T)	Attached to top of throttle body. See Fig. 5 .
Idle Air Control (IAC) Valve (6.0L VIN U)	Attached to top of throttle body. See Fig. 5 .
Secondary Air Injection Reaction Pump Shutoff Valve	On right rear of engine compartment. See Fig. 14 .
Secondary Air Injection Reaction Solenoid	On right rear of engine compartment. See Fig. 14 .
Shock Solenoid Valve	Part of each respective shock absorber.
Wastegate Solenoid (6.5L VIN F)	On top left rear of engine. See Fig. 8 .
Wastegate Solenoid (6.5L VIN S)	On top left rear of engine. See Fig. 8 .

Chevrolet Silverado 2500 1999 - SWITCHES

Chevrolet Silverado 2500 1999 SWITCHES

Component	Component Location
A/C Automatic Recirculating Switch	In A/C muffler hose, close to condenser.
A/C Compressor High Pressure Cutout Switch	On rear of A/C compressor.
A/C Compressor Low Pressure Cycling Switch	On right side of accumulator. See Fig. 14 .
Back-Up Lamp Switch	On left side of transmission.
Brake Fluid Level Switch	On left side of brake fluid reservoir.
Clutch Pedal Position Switch	On top of clutch pedal bracket.
Engine Coolant Level Switch	In coolant reservoir.
Engine Oil Level Switch	On right side of oil pan.
Low Washer Switch	In washer fluid reservoir.
Oil Pressure Switch (4.3L VIN W)	On top left rear of engine, near distributor. See Fig. 1 .
Oil Pressure Switch (6.5L VIN F)	Under intake manifold, left center of engine. See Fig. 10 .
Oil Pressure Switch (6.5L VIN S)	Under intake manifold, left center of engine. See Fig. 10 .
Park Brake Switch	Part of park brake assembly.
Park/Neutral Position Switch	On left side of transmission.
Seat Belt Switch	On driver's seat belt buckle.
Stoplamp Switch	On top of brake pedal bracket.

Chevrolet Silverado 2500 1999 - MISCELLANEOUS

Chevrolet Silverado 2500 1999 MISCELLANEOUS

Component	Component Location
Blower Motor Resistor	On HVAC module, near blower motor.
Data Link Connector (DLC)	Under left side of dash, below steering column.
Fuel Heater (6.5L VIN F)	On fuel manager/filter. See Fig. 12 .
Fuel Heater (6.5L VIN S)	On fuel manager/filter. See Fig. 12 .
Fuel Manager/Filter (6.5L VIN F)	On top rear of engine. See Fig. 8 .
Fuel Manager/Filter (6.5L VIN S)	On top rear of engine. See Fig. 8 .
Fuel Pressure Regulator (4.8L VIN V)	On left side fuel rail. See Fig. 5 .
Fuel Pressure Regulator (5.3L VIN T)	On left side fuel rail. See Fig. 5 .
Fuel Pressure Regulator (6.0L VIN U)	On left side fuel rail. See Fig. 5 .
Ignition Coil (4.3L VIN W)	On top right rear of engine. See Fig. 1 .
Ignition Coils (4.8L VIN V)	On top of left & right rocker covers.
Ignition Coils (5.3L VIN T)	On top of left & right rocker covers.
Ignition Coils (6.0L VIN U)	On top of left & right rocker covers.

Chevrolet Silverado 2500 1999 - CONNECTORS

Chevrolet Silverado 2500 1999 CONNECTORS

Component	Component Location
C100 (Black, 16 Pin)	Under UBEC.
C101 (Yellow, 2 Pin)	Under UBEC.
C102 (Black, 8 Pin)	Under UBEC.
C148 (Light Gray, 8 Pin)	On left side rocker cover.
C149 (Light Gray, 8 Pin)	On right side rocker cover.
C150 (Black, 4 Pin)	On left inner fender.
C151 (Black, 12 Pin)	On left inner fender.
C153 (Black, 3 Pin)	On left inner fender.
C200 (Black, 22 Pin)	At left kick panel.
C201	On steering column.
C201A (Black, 17 Pin)	On steering column.
C201B (Black, 18 Pin)	On steering column.
C201C (Black, 13 Pin)	On steering column.
C202 (Black, 8 Pin)	On left side of dash.
C210 (Black, 2 Pin)	At left "A" pillar.
C250 (Gray, 6 Pin)	Behind radio.
C251 (Gray, 6 Pin)	In right side of dash.
C296 (Black, 8 Pin)	Behind glove compartment box.
C297	On lower right side of dash.
C297A (Brown, 6 Pin)	On lower right side of dash.
C297B (Cream, 6 Pin)	On lower right side of dash.
C297C (Gray, 6 Pin)	On lower right side of dash.
C299 (Black, 22 Pin)	At right side of dash.
C301 (Black, 6 Pin)	Under left seat.
C303 (Black, 6 Pin)	Under right seat.
C305 (Gray, 12 Pin)	Under left front seat.
C398 (Black, 2 Pin)	Near left kick panel.
C399 (Black, 6 Pin)	Under right seat.

Chevrolet Silverado 2500 1999 - GROUNDS

Chevrolet Silverado 2500 1999 GROUNDS

Component	Component Location
G100	On left radiator support bracket.
G101	At right front of engine compartment.
G102 (4.3L VIN W)	On lower right front of engine block.
G102 (4.8L VIN V)	On left side of engine block. See Fig. 5 .
G102 (5.3L VIN T)	On left side of engine block. See Fig. 5 .
G102 (6.0L VIN U)	On left side of engine block. See Fig. 5 .
G102 (6.5L VIN F)	On right front of intake manifold.
G102 (6.5L VIN S)	On right front of intake manifold.
G103 (4.3L VIN W)	On right rear of engine block. See Fig. 1 .
G103 (4.8L VIN V)	On right rear of engine block.
G103 (5.3L VIN T)	On right rear of engine block.
G103 (6.0L VIN U)	On right rear of engine block.
G104 (4.3L VIN W)	On left rear of engine block. See Fig. 1 .
G104 (4.8L VIN V)	On left rear of engine block.
G104 (5.3L VIN T)	On left rear of engine block.
G104 (6.0L VIN U)	On left rear of engine block.
G104 (6.5L VIN F)	On rear of right cylinder head.
G104 (6.5L VIN S)	On rear of right cylinder head.
G105 (4.3L VIN W)	On lower right front of engine block.
G105 (4.8L VIN V)	On left front of engine block.
G105 (5.3L VIN T)	On left front of engine block.
G105 (6.0L VIN U)	On left front of engine block.
G105 (6.5L VIN F)	On rear of right cylinder head.
G105 (6.5L VIN S)	On rear of right cylinder head.
G106 (4.3L VIN W)	On right front of engine block.
G106 (4.8L VIN V)	On right rear of engine block.
G106 (5.3L VIN T)	On right rear of engine block.
G106 (6.0L VIN U)	On right rear of engine block.
G107	Engine ground strap.
G108	Body ground strap.
G110	On left front body mount.
G200	On right "A" pillar.
G203	On left "A" pillar.
G302	On left body mount.
G304	Under driver's seat.
G305	On left "B" pillar.
G306	On right "B" pillar
G401	On spare tire hoist bracket.
G403	On left frame rail.

Chevrolet Silverado 2500 1999 - SPLICES

Chevrolet Silverado 2500 1999 SPLICES

Component	Component Location
S100	In forward lamp harness.
S101	In engine harness.
S102	In engine harness.
S103	In engine harness.
S104	In engine harness.
S105	In engine harness.
S106	In engine harness.
S107	In engine harness.
S108	In engine harness.
S151	In engine harness.
S152	In engine harness.
S153	In engine harness.
S154	In engine harness.
S156	In engine harness.
S157	In engine harness.
S199	In engine harness.
S200	At roof marker lights.
S201	At roof marker lights.
S400	In camper wiring harness.
S401	In camper wiring harness.
S402	In camper wiring harness.
S403	In camper wiring harness.
S404	In camper wiring harness.
S405	In camper wiring harness.
S406	In camper wiring harness.