GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

Backup Lamp Switch (w/ M50)

Left side of transmission

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

Backup Lamp Switch (w/ M30)

Part of park/neutral position switch, left side of transmission

Engine Electrical Component Views in Engine

Lighting Systems Connector End Views in Lighting Systems

Electronic Climate Control (ECC) Module

The center of the IP, below the radio

HVAC Component Views in HVAC System with A/C - Automatic

HVAC Connector End Views in HVAC System with A/C - Automatic

Heater and A/C Controller

In the center of the IP

HVAC Component Views in HVAC Systems - Manual

--

Heater and A/C Controller (w/ Manual A/C) Connector C5 (4 Cavities) (Except Base Pickup)

Between connectors C1 and C3

HVAC Component Views in HVAC Systems - Manual

HVAC Connector End Views in HVAC Systems - Manual

Inside Rear View Mirror (Automatic Day/Night Mirror w/ Map Lamps)

At the windshield centerline

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

IP Fuse Block

LH of the IP, near the side door jamb switch

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Outside Rear View Mirror, LH (10 Cavities)

Door harness to outside rear view mirror pigtail connector

Power Door Systems Component Views in Doors

Power Door Systems Connector End Views in Doors

Park/Neutral Position and Backup Lamp Switch

Left of the transmission

Shift Lock Control Component Views in Automatic Transmission

--

Park/Neutral Position and Backup Lamp Switch, Connector C1 (7 Cavities)

Left of the transmission

Shift Lock Control Component Views in Automatic Transmission

Shift Lock Control Connector End Views in Automatic Transmission

Rear Window Defogger Grid (Utility)

Part of the liftglass window

Stationary Windows Component Views in Stationary Windows

--

Rear Window Defogger Relay (Utility)

In the underhood fuse block

Power and Grounding Component Views in Wiring Systems

--

Rear Window Defogger Switch (Utility w/ Manual A/C)

Part of the heater and A/C controller

HVAC Component Views in HVAC Systems - Manual

Stationary Windows Connector End Views in Stationary Windows

Rear Window Defogger Switch (Utility w/ Automatic A/C)

Part of the electronic climate control module

HVAC Component Views in HVAC Systems - Automatic

Stationary Windows Connector End Views in Stationary Windows

Underhood Fuse Block

On the top of the left inner wheelwell

Power and Grounding Component Views in Wiring Systems

--

Underhood Fuse Block Connector C1 (68 Cavities) (Body)

Below the underhood fuse block

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Underhood Fuse Block Connector C2 (68 Cavities) (Engine)

Below the underhood fuse block

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Underhood Fuse Block Connector C3 (32 Cavities) (Chassis)

Below the underhood fuse block

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

C203 (116 Cavities)

Body harness to IP harness, to the right of the IP

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C209 (16 Cavities) (Pickup)

Body harness to dome harness, at the LF of the IP, at the LF window

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C209 (16 Cavities) (Utility)

Body harness to dome harness, at the LF of the IP, at the LF window

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C229 (Utility) (4 Cavities)

Upper left hand of the dash, inline to dome harness

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C427 (1 Cavity) (Utility w/ Liftgate)

Body harness to liftgate harness, near the upper left corner of the liftgate

Harness Routing Views in Wiring Systems

--

C429 (1 Cavity) (Utility w/ Liftgate)

Body harness to liftgate harness, near the upper right corner of the liftgate

Harness Routing Views in Wiring Systems

--

C432 (1 Cavity) (Utility w/ Endgate)

Body harness to the endgate coiled cord connector LH, at the LR upper body, near the endgate liftglass

Harness Routing Views in Wiring Systems

--

C433 (1 Cavity) (Utility w/ Endgate)

Body harness to endgate coiled cord connector, RH, at the RR upper body, near the endgate liftglass

Harness Routing Views in Wiring Systems

--

C500 (4 Cavities) (w/o Power Locks/Windows)

Body harness to LF door harness, in the LF door

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C500 (22 Cavities) (w/ Power Locks/Windows)

Body harness to LF door harness, in the LF door

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

G202

(CKT 1850) Body harness, to the LF of the IP, above P100

Harness Routing Views in Wiring Systems

--

G203

(CKT 1050) Body harness, to the right of the IP, between C203 and the splice packs, breakout from harness attached to bulkhead (RH side)

Harness Routing Views in Wiring Systems

--

G204

(CKT 1050) Body harness, to the right of the IP, between C203 and the splice packs, breakout from harness attached to bulkhead (LH side)

Harness Routing Views in Wiring Systems

--

G420 (Utility)

(CKT 1450) Body harness, in the RR body corner, near C402 to the tail lamp harness

Harness Routing Views in Wiring Systems

--

G450 (Utility)

(CKT 1350) Body harness, in the LR body corner, near C403 to the tail lamp harness

Harness Routing Views in Wiring Systems

--

P100

IP bulkhead pass-through, LR of the engine compartment, on the cowl

Harness Routing Views in Wiring Systems

--

P600

Body harness to RF door pass-through, between the body and the RF door

Harness Routing Views in Wiring Systems

--

P901 (Utility w/ Liftgate)

Body to the LH liftgate harness, in the left side of the liftgate

Harness Routing Views in Wiring Systems

--

P902 (Utility w/ Liftgate)

Body to RH liftgate harness, in the right side of the liftgate

Harness Routing Views in Wiring Systems

--

S217 (w/o Auto A/C)

(CKT 341) IP harness, in the breakout to the heater controller connectors, 6 cm (2.4 in) into the breakout

Harness Routing Views in Wiring Systems

--

S302 (Utility w/ Sunroof)

(CKT 1850) Dome harness between the breakouts to the inside air temperature sensor and the LH visor vanity mirror lamp, 5 cm (1.9 in) from the breakout to the sensor

Harness Routing Views in Wiring Systems

--

S302 (Utility w/o Sunroof)

(CKT 1850) Dome harness between the breakouts to the inside air temperature sensor and the LH visor vanity mirror lamp, 5 cm (1.9 in) from the breakout to the sensor

Harness Routing Views in Wiring Systems

--

S309

(CKT 1324) Body harness, between the rear doors and the endgate connectors, 98 cm (38.5 in) from the breakout for the rear doors

Harness Routing Views in Wiring Systems

--

S427 (Utility)

(CKT 1350, CKT 1450) LR body harness, 7 cm (2.8 in) below the breakout to the left tail lamp connector C403

Harness Routing Views in Wiring Systems

--

Splice Pack SP203

(CKT 1050) IP harness, on the IP, behind HVAC controls

Harness Routing Views in Wiring Systems

--