GM Service Manual Online
For 1990-2009 cars only

Lighting Systems Components P32

Name

Location

Locator View

Connector End View

Backup Lamps (provision for)

At the rear lamps harness (body builder installed)

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Battery Junction Block

On the forward left side of the bulkhead, above P100

Power and Grounding Component Views in Wiring Systems

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Daytime Running Lamps (DRL) Module

Attached to the IP harness, located by the body builder

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Lighting Systems Connector End Views

Daytime Running Lamps (DRL) Relay

Mounted on top of the steering column support, at the driver's island

Lighting Systems Component Views

Lighting Systems Connector End Views

Daytime Running Lamps (DRL) Relay 2

On the forward lamps harness, located by the body builder

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Lighting Systems Connector End Views

Hazard Lamps Flasher

At the inner left side of the steering column support bracket

Lighting Systems Component Views

Lighting Systems Connector End Views

Headlamps/Panel Dimmer Switch

On the IP harness, located by the body builder

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Lighting Systems Connector End Views

Headlamps

In the forward lamps harness (body builder installed)

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Headlamps Dimmer Switch

At the left side of the steering column, above the support bracket

Lighting Systems Component Views

Lighting Systems Connector End Views

Headlamps Switch

On the IP harness, located by the body builder

--

Lighting Systems Connector End Views

Ignition Switch

On the lower right side of the steering column, below the support bracket

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Instrument Cluster

Body builder installed

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges and Console

Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges and Console

IP Fuse Block

Located by the body builder

Electrical Center Identification Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

IP Lamps Dimmer Switch

On the IP harness, located by the body builder

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Lighting Systems Connector End Views

License Lamps (provision for)

Body builder installed

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Park and Turn Signal Lamps

In the forward lamps harness (body builder installed)

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Park Brake Switch (w/o Auto Apply)

Body builder installed

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Park/Neutral Position and Backup Lamps Switch

On the left side of the transmission, near the middle

Lighting Systems Component Views

Lighting Systems Connector End Views

Seat Belt and Lamps Alarm Module

Attached to the IP fuse block

--

Audible Warnings Connector End Views in Instrument Panel, Gauges and Console

Sidemarker Lamps (provision for)

In the forward lamps harness (body builder installed)

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--

Stoplamps Switch

Above the brake pedal, at the right side of the steering column

Lighting Systems Component Views

Lighting Systems Connector End Views

Tail and Stop/Turn Signal Lamps (provision for)

Body builder installed

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--

Transmission Range (TR) Lamp

In the transmission range selector, on the steering column

Lighting Systems Component Views

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Turn Signal Switch

Part of the multifunction lever, on the steering column

Lighting Systems Component Views

Lighting Systems Connector End Views

C100

Engine harness to the forward lamps harness, at the left side of the engine bulkhead, near the battery junction block

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C200

Engine harness to the IP harness, in the bulkhead, near P100

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C203

Engine harness to the body builder provision harness, on top of the steering column support, at the left side

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C204

Marker lamps provision for the body builder

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C207

Engine harness to the windshield wiper harness, at the left side of the engine bulkhead, near the battery junction block

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C210

Dome lamp provision for the body builder

--

Inline Harness Connector End Views in Wiring Systems

C212

Park accessory provision for the body builder

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C213

Fog lamps provision for the body builder

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C300

Engine harness to rear chassis harness, near the middle of the chassis, at the outside of the left frame rail

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C400

Rear chassis harness to taillamp harness, behind the fuel tank, near the left frame rail

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C402

Center high mounted stoplamp (CHMSL) provision for the body builder

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C404

Mid-vehicle clearance lights provision for the body builder

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G101

Body builder installed

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G102

Body builder installed

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G103 (Gas)

At the rear of the right cylinder head

Power and Grounding Component Views in Wiring Systems

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G107

Body builder installed

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G108

On top of the thermostat housing

Power and Grounding Component Views in Wiring Systems

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G200

Mounted to the top front of the steering column support plate

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G401

Body builder installed

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P100

Main wiring pass through at the bulkhead

Harness Routing Views in Wiring Systems

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R101

In the engine harness, 7 cm (3 in) from the breakout for the engine coolant fan motor connector toward the A/C compressor relay

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S105

In the engine harness, 4 cm (2 in) from the breakout for the heated oxygen sensors, toward the ignition control module breakout

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S106/S107 (Resistor Splice)

Resistor splice for R101 in the engine harness, 7 cm (3 in) from the breakout for the engine coolant fan motor connector, toward the A/C compressor relay

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S117

In the engine harness, 7 cm (3 in) from the breakout for C100 and C207, toward the engine coolant fan motor

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S124 (Gas)

In the engine harness, 11 cm (4 in) from the breakout for the cruise control module, toward the starter relay

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S126 (Gas)

In the engine harness, 18 cm (7 in) from the breakout for the A/C compressor clutch and the EGR valve, toward the VCM

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S166 (Gas)

In the engine harness, 5 cm (2 in) from the breakout for the cruise control module, toward the VCM

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S166 (Diesel)

In the engine harness, 2 cm (1 in) from the breakout for C100 and C207, toward the auxiliary engine coolant fan motor

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S169 (Gas)

In the engine harness, 38 cm (15 in) from the breakout for C100 and C207, going away from passthrough P100

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S169 (Diesel)

In the engine harness, 8 cm (4 in) from the breakout to the engine coolant level switch and the auxiliary engine coolant fan motor connector

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S171

In the forward lamps harness, 12 cm (5 in) to the breakout for the left headlamp

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S172

In the forward lamps harness, 5 cm (2 in) to the breakout for the left headlamp

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S173

In the forward lamps harness, 9 cm (4 in) to the breakout for the left headlamp, toward the DRL relay

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S174

In the forward lamps harness, 18 cm (7 in) to the breakout for the right headlamp, toward the DRL relay

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S175

In the forward lamps harness, 9 cm (4 in) to the breakout for the right headlamp, toward the DRL relay

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S176

In the forward lamps harness, 5 cm (2 in) to the breakout for the right headlamp, toward the DRL relay

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S201

In the IP harness, 10 cm (4 in) from C200 toward the IP fuse block

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S204

In the IP harness, 26 cm (10 in) from the horn relay breakout, toward P100

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S206

In the IP harness, 25 cm (10 in) from the instrument cluster connector

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S207

In the IP harness, 20 cm (8 in) from the engine harness connector C200 and 4 relay sockets

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S211

In the IP harness, 6 cm (2 in) from the dimmer switch and the IP cluster connector breakout, toward the IP fuse block

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S212

In the IP harness, 10 cm (4 in) from the breakout for the instrument cluster connector, toward the IP fuse block

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S213

In the IP harness, 15 cm (6 in) from the harness in the breakout for the headlamp switch connector

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S214

In the IP harness, 18 cm (7 in) from the breakout for the IP lamp dimmer switch and the instrument cluster connector, toward the IP fuse block

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S215

In the IP harness, 35 cm (14 in) from the IP fuse block

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S231

In the IP side of the engine harness, 7 cm (4 in) from the turn signal switch connector breakout

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S401

In the rear lamp harness, 45 cm (17 in) from C400

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S402

In the rear lamp harness, 55 cm (22 in) from C400

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S403

In the rear lamp harness, 65 cm (26 in) from C400

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S404

In the rear lamp harness, 5 cm (2 in) from the breakout for the left taillamp

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S405

In the rear lamp harness, 5 cm (2 in) from the breakout for the right taillamp

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Lighting Systems Components P42

Name

Location

Locator View

Connector End View

Backup Lamps (provision for)

At the rear lamps harness (body builder installed)

Lighting Systems Component Views

--

Backup Lamps Switch (Manual Trans)

On the upper left side of the transmission, near the middle

Lighting Systems Component Views

Lighting Systems Connector End Views

Battery Junction Block

On the forward left side of the bulkhead, above P100

Power and Grounding Component Views in Wiring Systems

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Daytime Running Lamps (DRL) Relay

Left interior bulkhead, on the relay bracket

Lighting Systems Component Views

Lighting Systems Connector End Views

Daytime Running Lamps (DRL) Module

On the IP harness, located by the body builder

--

Lighting Systems Connector End Views

Hazard Lamps Flasher

On the IP harness, located by the body builder

Lighting Systems Component Views

Lighting Systems Connector End Views

Headlamps

In the forward lamps harness (body builder installed)

Lighting Systems Component Views

--

Headlamps Dimmer Switch

At the left side of the steering column, above the support bracket

Lighting Systems Component Views

Lighting Systems Connector End Views

Headlamps Switch

On the IP harness, located by the body builder

--

Lighting Systems Connector End Views

Ignition Switch

On the lower right side of the steering column, below the support bracket

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Instrument Cluster

Body builder installed

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges and Console

Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges and Console

IP Fuse Block

Located by the body builder

Electrical Center Identification Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

IP Lamps Dimmer Switch

On the IP harness, located by the body builder

--

Lighting Systems Connector End Views

License Lamps (provision for)

Body builder installed

Lighting Systems Component Views

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Park and Turn Signal Lamps

In the forward lamps harness (body builder installed)

Lighting Systems Component Views

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Park Brake Indicator Switch

Body builder installed

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Park Brake System Connector End Views in Park Brake

Park/Neutral Position and Backup Lamps Switch

On the left side of the transmission, near the middle

Lighting Systems Component Views

Lighting Systems Connector End Views

Powertrain Control Module (EFI Diesel)

At the left side of the drivers island, on the relay bracket

Engine Controls Component Views in Engine Controls

Powertrain Control Module Connector End Views in Engine Controls

Seat Belts Alarm Module

Attached to the IP fuse block

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Audible Warnings Connector End Views in Instrument Panel, Gauges and Console

Sidemarker Lamps (provision for)

In the forward lamps harness (body builder installed)

Lighting Systems Component Views

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Tail and Stop/Turn Signal Lamps (provision for)

Body builder installed

Lighting Systems Component Views

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Torque Converter Clutch (TCC) and Stoplamps Switch

Above the brake pedal, at the right side of the steering column

Lighting Systems Component Views

Lighting Systems Connector End Views

Transmission Range (TR) Lamp

In the transmission range selector, on the steering column

Lighting Systems Component Views

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Turn Signal Switch

Part of the multifunction lever, on the steering column

Lighting Systems Component Views

Lighting Systems Connector End Views

C200

Engine harness to the IP harness, in the bulkhead, near P100

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C202

Engine harness to the IP harness, in the bulkhead, near P100

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C203

Engine harness to the IP harness, in the bulkhead, near P100

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C205

On the IP harness located by the body builder

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C207

IP harness to the windshield wiper/washer pump motor harness, on the IP harness located by the body builder

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C211

IP harness to the engine harness, above the steering column upper support

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C300

Engine harness to the rear chassis harness, near the middle of the chassis at the outside of the left frame rail

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C400

Rear chassis harness to the taillamp harness, behind the fuel tank near the left frame rail

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C402

At the rear of the rear lamps harness, approximately 15 cm (6 in) from the conduit end labeled CHMSL

Harness Routing Views in Wiring Systems

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G108 (Manual Trans)

At the right front of the engine near the generator bracket

Power and Grounding Component Views in Wiring Systems

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G108 (Auto Trans)

At the rear of the left cylinder head

Power and Grounding Component Views in Wiring Systems

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G200

Left interior bulkhead near the relay bracket

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G401

Body builder installed

Power and Grounding Component Views in Wiring Systems

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S101

In the forward lamps harness, approximately 25 cm (10 in) from C203

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S103

In the forward lamps harness, approximately 110 cm (41 in) from the left lamps breakout toward the right lamps breakout

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S104

In the forward lamps harness, approximately 17 cm (7 in) from the right lamps breakout toward the left lamps

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S105

In the forward lamps harness, approximately 122 cm (44 in) from the right lamps breakout toward the left lamps

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S131

In the engine harness, at the battery junction block fusible link C3

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S143 (MFI Diesel)

In the engine harness, approximately 17 cm (7 in) from P100

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S143 (EFI Diesel)

In the engine harness, approximately 16 cm (6 in) from the A/C compressor clutch breakout, toward C200

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S143 (Gasoline)

In the engine harness, approximately 6 cm (2 in) from the C200 breakout, toward the MAF sensor

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S201 (EFI Diesel)

In the IP side of the engine harness, approximately 16 cm (6 in) from the stoplamp switch, toward P100

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S204

In the IP harness, approximately 20 cm (8 in) from the fuse block breakout, towards C200

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S205

In the IP harness, approximately 4 cm (2 in) before the fuse block breakout, toward C200

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S206

In the IP harness, approximately 12 cm (5 in) before the fuse block breakout, toward C200

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S207

In the IP harness, approximately 40 cm (16 in) before the fuse block breakout, toward the instrument cluster connector

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S208

In the IP harness headlamps switch breakout approximately 8 cm (3 in) before the fuse block breakout, toward C200

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S209

In the IP harness, approximately 50 cm (20 in) before the fuse block breakout, toward the instrument cluster

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S218

In the IP harness, approximately 28 cm (11 in) before the fuse block breakout, toward C200

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S220

In the IP harness, approximately 16 cm (6 in) before the fuse block breakout, toward C200

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S257

In the IP harness, approximately 24 cm (10 in) from the fuse block breakout, toward C200

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S401 (125 in, 133 in wheelbase; 110 in, 157 in with school bus)

In the rear lamps harness, approximately 45 cm (17 in) from C400

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S401 (157 in wheelbase w/o school bus; 178 in with school bus)

In the rear lamps harness, approximately 100 cm (39 in) from C400

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S402 (125 in, 133 in wheelbase; 110 in, 157 in w/o school bus)

In the rear lamps harness, approximately 55 cm (22 in) from C400

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S402 (157 in wheelbase with school bus, 178 in w/o school bus

In the rear lamps harness, approximately 110 cm (43 in) from C400

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S403 (125 in, 133 in wheelbase; 110 in, 157 in w/o school bus)

In the rear lamps harness, approximately 65 cm (26 in) from C400

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S403 (157 in wheelbase with school bus, 178 in w/o school bus

In the rear lamps harness, approximately 120 cm (47 in) from C400

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S404

In the rear lamps harness, approximately 5 cm (2 in) from right taillamps breakout

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S405

In the rear lamps harness, approximately 5 cm (2 in) from the left taillamps breakout

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