GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 Envoy - 4WD 🢒 Body and Accessories 🢒 Wiring Systems 🢒 Lighting Systems Component Views
Figure 1:

Body Relay Block Relays
Object Number: 238121 Size: LF
(1)Park Lamp Relay
(2)Courtesy Lamp Relay
(3)Retained Accessory Power Relay
(4)Power Seats Circuit Breaker
(5)Power Windows Circuit Breaker
(6)Inadvertent Power Relay
(7)Door Lock Relay
(8)Headlamp Ground Relay
(9)Driver Door Unlock Relay
(10)Door Unlock Relay
Figure 2:

Dome and High Mounted Stop Lamp (Pickup)
Object Number: 357177 Size: LF
(1)Dome and High Mounted Stop Lamp
Figure 3:

Dome Lamp Harness w/o Driver Information Display Module (Utility)
Object Number: 357174 Size: LF
(1)Dome Lamp
(2)S300
(3)S302
(4)Dome Lamp Harness
(5)C209
(6)Sunshade Mirror Lamp, LH
(7)Inside Rear View Mirror
(8)Sunshade Mirror Lamp, RH
Figure 4:

DRL Relay
Object Number: 400500 Size: LF
Figure 5:

Floor Shifter Harness Connections
Object Number: 401101 Size: MF
(1)Automatic Transmission Controller and Connector
(2)Automatic Transmission Preference Switch Connector
(3)Splice S336
(4)Floor Shifter
(5)Automatic Transmission Indicator Lamp
(6)Splice S335
Figure 6:

FOG LP Relay
Object Number: 357890 Size: LF
Figure 7:

Forward Lamps Wiring Harness (LH Shown, RH Opposite)
Object Number: 354565 Size: MF
(1)Headlamp, LH Low Beam (Chevrolet)
(2)Headlamp, LH High Beam (Chevrolet)
(3)Headlamp, LH Low Beam (Oldsmobile/GMC)
(4)Headlamp, LH High Beam (Oldsmobile/GMC)
(5)Fog Lamp, LH (GMC)
(6)Park and Turn Signal Lamp, LH (Oldsmobile/GMC)
(7)Side Marker Lamp, LH (Oldsmobile/GMC)
(8)Fog Lamp, LH (Chevrolet)
(9)Forward Lamps Harness
(10)Park and Turn Signal Lamp, LH (Chevrolet)
(11)Side Marker Lamp, LH (Chevrolet)
Figure 8:

Forward Lamps Wiring Harness Foglamps (RH Shown, LH Opposite)
Object Number: 354567 Size: MF
(1)Fog Lamp, RH (Bravada, Envoy)
(2)Fender, RH
Figure 9:

HDLP PWR Relay
Object Number: 357889 Size: LF
Figure 10:

Headlamps
Object Number: 357145 Size: MF
(1)Headlamp Switch
(2)IP Dimmer Switch
(3)Fog Lamp Switch
(4)Dome Lamp Override Switch
Figure 11:

Headlamp Ballast to Radiator Support (Envoy Only)
Object Number: 354576 Size: MF
(1)Headlamp Ballast, LH (HID)(RH Similar)
(2)Low Beam, LH (HID)(w/Starter)(RH Similar)
(3)HID Lens Assembly
(4)Ballast Support Tray
Figure 12:

Instrument Panel, RF
Object Number: 357161 Size: LF
(1)C102
(2)C203
(3)Instrument Panel (IP)
(4)Recirculation Door Motor
(5)Turn Signal Lamp 2/4 Flasher (Pickup) or Turn Signal Lamp 3/6 Flasher (Utility)
(6)C601
(7)C600
(8)Transfer Case Shift Control Module Connector
(9)Splice Pack SP200
(10)Splice Pack SP204
(11)G203, G204 and G205
(12)HVAC Solenoid Assembly Connector (w/ Auto A/C)
(13)Air Temperature Valve Sensor and Motor Connector
Figure 13:

IP Wiring Harness
Object Number: 357160 Size: LF
(1)Supplemental Inflatable Restraint IP Module
(2)C201
(3)IP Compartment Lamp
(4)Door Jamb Switch, RH Front
Figure 14:

IP Wiring Harness Composite View (with Auto A/C)
Object Number: 357142 Size: LF
(1)Supplemental Inflatable Restraint IP Module Switch Connector
(2)Radio Connector
(3)Sun Load Temperature Sensor
(4)Transfer Case Select Switch
(5)Electronic Climate Control (EEC) Module
(6)Instrument Cluster Connector
(7)Instrument Panel (IP)
(8)Rear Wiper/Washer Switch and Endgate/Liftgate Window Release Switch
(9)Courtesy Lamp, LF Console
(10)S240
(11)Body Control Module (BCM) Connector C3
(12)C224
(13)S275
(14)S205
(15)S283
(16)S208
(17)Splice Pack SP203
(18)S272
(19)S274
(20)S273
(21)S280
(22)S223
(23)Courtesy Lamp, RF Console
(24)C102
(25)C203
(26)Door Jamb Switch, RH Front
(27)IP Compartment Lamp
(28)Ambient Light Sensor
(29)IP Speaker, RH
Figure 15:

License Lamp Wiring (Fleetside Pickup)
Object Number: 357374 Size: LF
(1)Rear License Plate Lamp Bulb, RH
(2)Rear License Plate Lamp, RH
(3)Rear License Plate Lamp Bulb, LH
(4)Rear License Plate Lamp, LH
Figure 16:

License Lamp Wiring (Sportside Pickup)
Object Number: 357377 Size: LF
(1)Rear License Plate Lamp
(2)C430
Figure 17:

License Lamp Wiring (Utility)
Object Number: 357381 Size: MF
(1)Rear License Plate Lamp, RH
(2)Rear License Plate Lamp, LH
(3)Rear License Plate Lamp Harness
(4)Rear Bumper
Figure 18:

LOW BEAM Relay (Envoy Only)
Object Number: 400505 Size: LF
Figure 19:

Manual Transmission (2.2 L)
Object Number: 357136 Size: LF
(1)Vehicle Speed Sensor
(2)Backup Lamp Switch
(2)Backup Lamp Switch
(3)Heated Oxygen Sensor (HO2S, Bank 1, Sensor 1)
(4)C117
Figure 20:

Rear Frame Location View, 4-Door Utility
Object Number: 357334 Size: LF
(1)Trailer Wiring Provision
(2)Splice Pack SP423
(3)Evaporative (EVAP) Emissions Canister Vent Valve
(4)C430
(5)Fuel Filler Neck Ground Strap
(6)G402
Figure 21:

Rear Lamps (Pickup)
Object Number: 357373 Size: LF
(1)Side Marker Lamp, RH Rear
(2)Park and Turn Signal Lamp, RH Rear
(3)Backup Lamp, RH
(4)Splice Pack SP400
(5)Backup Lamp, LH
(6)Side Marker Lamp, LH Rear
(7)Park and Turn Signal Lamp, LH Rear
Figure 22:

Rear Lamps Connection (Utility LH Side Shown, RH Side Similar)
Object Number: 357368 Size: LF
(1)C403 (LH) and C402 (RH)
(2)S417 (LH) and S418 (RH)
(3)S415 (LH) and S416 (RH)
(4)S419 (LH) and S420 (RH)
(5)P402 (LH) and P403 (RH)
(6)Park and Turn Signal Lamps, LH Rear (RH Similar) Upper and Lower
(7)Backup Lamp, LH (RH Similar)
Figure 23:

Rear Roof (Utility)
Object Number: 357361 Size: LF
(1)High Mount Stop Lamp (w/Endgate)
(2)Cargo Lamp (w/Endgate)
(3)High Mount Stop Lamp (w/Liftgate)
(4)Cargo Lamp (w/Liftgate)
(5)P904 (w/Endgate)
Figure 24:

IP Harness, Underhood Lamp
Object Number: 357127 Size: LF
(1)Hood
(2)Underhood Lamp
(3)G117
(4)G120
(5)Underhood Lamp Connector