Chevrolet Astro 1999 - 1999 GENERAL MOTORS Astro & Safari

Chevrolet Astro 1999 - BUZZERS, RELAYS & TIMERS

Chevrolet Astro 1999 BUZZERS, RELAYS & TIMERS

Component	Component Location
A/C Enable Relay	In underhood fuse/relay center.
A/C Relay	In underhood fuse/relay center.
Blower Motor Resistor & Relay Pack	Mounted between evaporator & front blower motor, on the right front of the dash housing.
Door Lock Relay	Behind right kick panel.
DRL Relay	Lower right side of convenience center. See Fig. 7.
Fuel Pump Relay	In underhood fuse/relay center.
Horn Relay	On convenience center. See Fig. 7.
Liftgate Lock/Unlock Relay	Right rear quarter panel, near "D" pillar.
Rear Defogger Timer Relay	Center of dash, on back of HVAC control panel.
Starter Enable Relay	In underhood fuse/relay center.
Turn/Hazard Flasher Module	On convenience center. See Fig. 7.
Upfitter Accessory Relay	In underhood fuse/relay center.

Chevrolet Astro 1999 - CIRCUIT PROTECTION DEVICES

Chevrolet Astro 1999 CIRCUIT PROTECTION DEVICES

Component	Component Location
A/C Compressor Clutch Diode	In underhood fuse/relay center.
Daytime Running Lamp (DRL) Diode	On lower part of left "B" pillar.
I/P Fuse Block	Behind left side of dash. See Fig. 7.
Underhood Fuse/Relay Center	On left side of firewall.

Chevrolet Astro 1999 - CONTROL UNITS

Chevrolet Astro 1999 CONTROL UNITS

Component	Component Location
Active Transfer Case (ATC) Module	Rear of transmission.
Audio Alarm Module	On convenience center, behind left side of dash. See Fig. 7.
Automatic Transfer Case Shift Control Module	Behind left kick panel.
Cruise Control Module	Center front of dash, left of windshield wiper module. See Fig. 4.
Daytime Running Lamps (DRL) Control Module	Behind left side of dash, taped to main harness.
Door Lock Control Module	Behind right kick panel.
Electronic Brake Control Module (EBCM)	On left front side of frame, left of transmission.
Ignition Control Module (ICM)	Top of engine, front of coil. See Fig. 3.
Interior Lamp Control Module	Behind lower left side of dash, mounted to DLC bracket.
Passlock Module	Behind air duct, to right of instrument cluster.
Rear Radio Control Module	On left side of vehicle, behind "B" pillar.
Remote Control Door Lock Receiver	Behind air duct, right of instrument cluster.
Sub-Woofer Amplifier	On left center of vehicle, behind trim panel.
Supplemental Inflatable Restraint Sensing & Diagnostic Module	Under driver's seat.
Vehicle Control Module (VCM)	Left side of engine compartment.

Chevrolet Astro 1999 - MOTORS

Chevrolet Astro 1999 MOTORS

Component	Component Location
Blower Motor (Front)	Behind coolant recovery reservoir, on right front fender. See Fig. 4.
Blower Motor (Rear A/C)	Left rear of vehicle, near "D" pillar.
Blower Motor (Rear Heater)	Left side of vehicle, behind "B" pillar. See Fig. 9.
Encoder Motor	Inside transfer case. See Fig. 6.
Fuel Pump & Sender	In fuel tank.
Idle Air Control (IAC) Valve	On left rear of throttle body. See Fig. 2.
Rear Liftgate Release Motor	In center of liftgate. See Fig. 8.
Temperature Control Motor	Behind right side of dash, left side of main air duct.
Window Washer Pump Motor (Front)	In windshield washer reservoir.
Window Washer Pump Motor (Rear)	In windshield washer reservoir.
Window Wiper Motor (Rear)	In center of liftgate. See Fig. 8.
Window Wiper/Washer Module (Rear)	In left side of liftgate. See Fig. 8.
Windshield Wiper Motor & Module (Front)	On center front of dash, next to cruise control module. See Fig. 4.

Chevrolet Astro 1999 - SENDING UNITS & SENSORS

Chevrolet Astro 1999 SENDING UNITS & SENSORS

Component	Component Location
Ambient Air Temperature Sensor	Center of core support, in front of radiator.
Bank No. 1 Heated Oxygen Sensor (HO2S) No. 1	On left front exhaust Y-pipe.
Bank No. 1 Heated Oxygen Sensor (HO2S) No. 3	On exhaust pipe, between catalytic converter & muffler.
Bank No. 2 Heated Oxygen Sensor (HO2S) No. 1	On right front exhaust Y-pipe, closest to exhaust manifold.
Camshaft Position (CMP) Sensor	On side of distributor. See Fig. 2.
Crankshaft Position (CKP) Sensor	Behind & to right of engine crankshaft pulley. See Fig. 1.
Engine Coolant Temperature (ECT) Sensor	On side of linear EGR valve solenoid. See Fig. 1.
Engine Coolant Temperature Gauge Sensor	On left side of engine block. See Fig. 2.
Fuel Pump & Sender	In fuel tank.
Intake Air Temperature Sensor	Top of air intake duct. See Fig. 4.
Knock Sensor	At left rear of distributor, on engine block. See Fig. 2.
Manifold Absolute Pressure (MAP) Sensor	Top of engine, near ignition coil. See Fig. 3.
Mass Airflow Sensor	Front of air intake duct. See Fig. 4.
Oil Pressure Switch & Sender	On top rear of engine. See Fig. 2.
Passlock Sensor	In steering column, near lock cylinder.
Propshaft Speed Sensor (Front)	Near center of transfer case. See Fig. 6.
Propshaft Speed Sensor (Rear)	Near center of transfer case. See Fig. 6.
Supplemental Inflatable Restraint Front End Discriminating Sensor	On front frame crossmember.
Throttle Position (TP) Sensor	On left side of throttle body. See Fig. 2.
Vehicle Speed Sensor (VSS) (2WD)	On rear of transmission. See Fig. 5.
Vehicle Speed Sensor (VSS) (4WD)	On rear of transmission. See Fig. 6.
Wheel Speed Sensor (2)	On respective lower control arm.

Chevrolet Astro 1999 - SOLENOIDS & SOLENOID VALVES

Chevrolet Astro 1999 SOLENOIDS & SOLENOID VALVES

Component	Component Location
Automatic Transmission Shift Lock Control Solenoid	In steering column.
Evaporative Emission (EVAP) Canister Purge Solenoid Valve	On top of engine, next to MAP sensor. See Fig. 3.
Evaporative Emission (EVAP) Canister Vent Valve	Underside of vehicle, on frame rail by fuel filter.
Exhaust Gas Recirculation (EGR) Valve	On top of engine, left of generator. See Fig. 1.
Heater & A/C Control Valve Solenoid	Lower left side of evaporator behind receiver-drier. See Fig. 4.

Chevrolet Astro 1999 - SWITCHES

Chevrolet Astro 1999 SWITCHES

Component	Component Location
A/C High Pressure Cut-Off Switch	On rear of A/C compressor. See Fig. 2.
A/C Low Pressure Cut-Off Switch	Top of A/C receiver-drier. See Fig. 4.
Brake Pedal Position (BPP) Switch	Above brake pedal.
Brake Pressure Warning Switch	On brake pressure modulator valve assembly.
Key-In Warning Buzzer Switch	Inside steering column, by lock cylinder.
Oil Pressure Switch & Sender	On top rear of engine. See Fig. 2.
Park Brake Indicator Switch	On parking brake assembly.
Park/Neutral Position & Back-Up Lamp Switch	On left center of transmission.
Seat Belt Buckle Switch	On buckle side of left seat belt assembly.

Chevrolet Astro 1999 - MISCELLANEOUS

Chevrolet Astro 1999 MISCELLANEOUS

Component	Component Location
Blower Motor Resistor & Relay Pack	Behind right side of dash, between evaporator & front blower motor.
CHMSL Resistor	On left kick panel.
Convenience Center	Left of I/P fuse block, by left kick panel. See Fig. 7.
Data Link Connector (DLC)	Under left side of dash.
Distributor	On top rear of engine. See Fig. 2.
Ignition Coil	On top of engine, behind generator. See Fig. 3.
Rear A/C Resistor Pack (Rear A/C)	Above rear blower motor.
Resistor Pack (Rear Heater)	Top of rear heater core. See Fig. 9.

Chevrolet Astro 1999 - CONNECTORS

Chevrolet Astro 1999 CONNECTORS

Component	Component Location
C100 (Black, 36 Pin)	In left side of dash.
C102 (Gray, 5 Pin)	In left side of dash.
C103 (Black, 3 Pin)	On top of engine. See Fig. 2.
C105 (Black, 6 Pin)	On left front firewall, below underhood fuse & relay center.
C200 (White, 16 Pin)	Behind left kick panel.
C201 (Black, 48 Pin)	Center of dash.
C202 (Black, 4 Pin)	In right kick panel.
C203 (Black, 16 Pin)	In right kick panel.
C204 (Black, 8 Pin)	In right kick panel.
C205 (White, 16 Pin)	In right kick panel.
C206 (Black, 1 Pin)	In I/P fuse block.
C207 (Gray, 6 Pin)	In I/P fuse block.
C209 (Natural, 2 Pin)	In I/P fuse block.
C210 (Black, 2 Pin)	In front of I/P fuse block.
C218 (Green, 3 Pin)	In I/P fuse block.
C219 (Black, 4 Pin)	In I/P fuse block.
C222 (Gray, 2 Pin)	In I/P fuse block.
C300 (Natural, 10 Pin)	In left kick panel.
C301 (White, 16 Pin)	In left kick panel.
C303 (Blue, 8 Pin)	In left kick panel.
C306 (Black, 2 Pin)	Under driver seat.
C307 (Gray, 2 Pin)	Under driver seat.
C333 (Black, 6 Pin)	Behind bottom of left "B" pillar.
C401 (Black, 2 Pin)	At top of left "D" pillar.

Chevrolet Astro 1999 - GROUNDS

Chevrolet Astro 1999 GROUNDS

Component	Component Location
G100	On right front of radiator support, next to engine coolant reservoir.
G101	On left front radiator support, below main body ground.
G102	On left side of radiator support.
G103	On lower right front side of engine.
G104	On right front firewall, above blower motor.
G105	On thermostat housing.
G106	On left rear of engine, next to knock sensor. See Fig. 2.
G107	On left rear of engine, next to knock sensor. See Fig. 2.
G110	Next to battery.
G200	On right front "A" pillar, above left front door jamb switch.
G300	On right front "A" pillar, above left front door jamb switch.
G301	Above rear heater, toward rear of vehicle.
G302	On engine harness, 28 cm from fuel pump breakout.
G400	On upper half of left "D" pillar.
G401	On upper half of right "D" pillar.
G403	On upper half of right "D" pillar.
G404	Below rear A/C blower, toward front of vehicle.

Chevrolet Astro 1999 - SPLICES

Chevrolet Astro 1999 SPLICES

Component	Component Location
S100	In forward lamp harness, 8 cm from right headlamp breakout.
S103	In forward lamp harness, 3 cm from left headlamp breakout.
S104	In forward lamp harness, 11.5 cm from left park/turn lamp breakout.
S106	In forward lamp harness, 7.5 cm from left headlamp.
S107	In front lamp harness, 15 cm from horn.
S108	In engine harness, 28.5 cm from underhood fuse & relay center.
S109	In engine harness, 28.5 cm from underhood fuse & relay center.
S110	In engine harness, 24 cm from underhood fuse block breakout.
S111	In engine harness, 17 cm from underhood fuse & relay center.
S114	In engine harness, 4 cm from mass airflow sensor breakout.
S115	In engine harness, 18 cm from mass airflow sensor breakout, toward C100.
S116	In engine harness, 16 cm from mass airflow sensor breakout, behind battery.
S117	In engine harness, 2.5 cm from A/C low pressure cut-off switch breakout.
S119	In engine harness, 9 cm from A/C low-pressure cut-off switch breakout.
S123	In engine harness, 6.5 cm from fuel injector harness, breakout, toward C100.
S124	In engine harness, 13 cm from oil pressure switch breakout. See Fig. 2.
S126	In engine harness, 6.5 cm from knock sensor connector breakout, toward C100. See Fig. 2.
S127	In engine harness, 11 cm from park/neutral position & backup lamp switch breakout.
S203	In I/P harness, 4 cm from C100, toward right side of dash.
S204	In I/P harness, 7 cm from C100 breakout.
S205	In I/P harness, 7.5 cm from C100 breakout.
S206	In I/P harness, 13 cm from C100 breakout.
S207	In I/P harness, 7.5 cm from C201 breakout, toward right side of dash.
S209	In I/P harness, 1.5 cm from C201 breakout, toward right side of dash.
S210	In I/P harness, 4.5 cm from C201 breakout, toward right side of dash.
S213	In I/P harness, 41 cm from headlamp switch connector.
S219	In I/P harness, 4 cm from instrument cluster connector breakout.
S220	In I/P harness, 10.5 cm from instrument cluster breakout.
S221	In I/P harness, 10 cm from headlamp switch breakout.
S223	In I/P harness, 10.5 cm from headlamp switch breakout.
S224	In I/P harness, 17 cm from radio breakout.
S227	In I/P harness, 4 cm from radio connectors breakout.
S229	In I/P harness, 4 cm from temperature control motor breakout.
S234	In I/P harness, 16 cm from cigar lighter connector.
S236	In vanity mirror harness, 7.5 cm from left vanity mirror breakout.
S237	In vanity mirror harness, 7.5 cm from left vanity mirror breakout.
S240	In upfitter harness, 45 cm from C210.
S242	In upfitter harness, 40 cm from C333.
S245	In transfer case harness, 10.5 cm from park brake warning switch breakout.
S300	In I/P harness, 4 cm from left door jamb switch breakout, toward rear of vehicle.
S303	In l/P harness, 2.5 cm from I/P fuse block, near park brake switch breakout.
S305	In I/P harness, 7 cm from I/P fuse block.
S315	In body harness, 4 cm from left "B" pillar breakout, toward top of vehicle.
S322	In left "B" pillar, 4 cm from daytime running lamp relay diode connector breakout, toward rear of vehicle.
S323	In power seat harness, 7.5 cm left power seat.
S324	In I/P harness, 20.5 cm from park brake switch connector breakout.
S325	In left kick panel, 4 cm from left door jamb switch breakout, toward C100.
S326	In left kick panel, 13 cm from left door jamb switch breakout, behind battery.
S327	In left kick panel, 28 cm from park brake switch breakout, toward rear of vehicle.
S332	In power seat harness, 7.5 cm from right power seat breakout, toward right power seat.
S333	In engine harness, 15 cm from vehicle speed sensor. See Fig. 5.
S403	In right rear "D" pillar, 4.5 cm from right rear door breakout.
S407	In liftgate body harness, 19.5 cm from G403 breakout , toward top of vehicle.
S500	In left door harness, 17 cm from power window switch breakout.
S504	In left door harness, 4 cm from power door lock switch breakout.
S505	In left door harness, 4 cm from power door lock switch breakout, toward courtesy lamp.
S600	In right door harness, 43.5 cm from power door lock switch breakout.
S601	In right door harness, 4 cm from power door lock switch breakout.