GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

Backup Lamps Switch

In the transmission range (TR) shift control

Lighting Systems Component Views

Lighting Systems Connector End Views

Brake Lamps Relay

In the engine wiring harness junction block (underhood fuse relay center), bottom relay, second from right

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Daytime Running Lamps (DRL) Control Module

Taped to the wiring harness above the IP wiring harness junction block

Lighting Systems Component Views

Lighting Systems Connector End Views

Daytime Running Lamps (DRL) Diode Module

On the left side of the steering column support

Lighting Systems Component Views

Lighting Systems Connector End Views

Daytime Running Lamps (DRL) Relay

In the IP wiring harness junction block

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Diode Network

Taped to the wiring harness near the IP wiring harness junction block

Hydraulic Brake Component Views in Hydraulic Brakes

Hydraulic Brake Connector End Views in Hydraulic Brakes

Engine Wiring Harness Junction Block (Underhood Fuse Relay Center)

At the lower LH corner of the cowl

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Fuse Block

Body builder installed

Electrical Center Identification Viewsin Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Headlamps Dimmer Switch

On the steering column, left side, part of the multifunction switch

Lighting Systems Component Views

Lighting Systems Connector End Views

Headlamps Switch

Body builder installed

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Lighting Systems Connector End Views

Ignition Switch

On the right side of the steering column

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Instrument Cluster

Body builder installed

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

Instrument Panel Lamps Dimmer Switch

Body builder installed

--

Lighting Systems Connector End Views

IP Wiring Harness Junction Block

At lower left corner of the cowl on the IP side

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Stoplamps Switch

On the brake pedal linkage

Lighting Systems Component Views

Lighting Systems Connector End Views

Transmission Range (TR) Lamp

In the transmission range (TR) shift control

Lighting Systems Component Views

Lighting Systems Connector End Views

Turn/Hazard Lamp Switch

On the steering column, left side, part of the multifunction switch

Lighting Systems Component Views

Lighting Systems Connector End Views

Turn/Hazard Lamp Flasher

In the IP wiring harness junction block, at lower left corner of the cowl on the IP side

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

C100

At the lower left corner of the bulkhead; the IP harness end is attached to the bulkhead

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C104

On the engine side of the bulkhead near C100

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C110

On top of the transmission

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Inline Harness Connector End Views in Wiring Systems

C112

On top of the transmission

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C202

On top of the steering column support

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C203

On top of the steering column support

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C402

RH frame rail to the rear of the fuel tank

--

Inline Harness Connector End Views in Wiring Systems

C403

RH frame rail to the rear of the fuel tank

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Inline Harness Connector End Views in Wiring Systems

C412

In the rear chassis harness, 250 cm (98 in) from the fuel module breakout toward C300

--

Inline Harness Connector End Views in Wiring Systems

C503

Tail lamp harness, 145 cm (59 in) from C403

--

Inline Harness Connector End Views in Wiring Systems

G102

On the front center of the engine, at the thermostat housing

Power and Grounding Component Views in Wiring Systems

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G104

Rear of the RH cylinder bank

Power and Grounding Component Views in Wiring Systems

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G105

Front frame crossmember, body builder installed

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--

G106

Front frame crossmember, body builder installed

--

--

G107

Front frame crossmember, body builder installed

--

--

G200

On top of the steering column support

Power and Grounding Component Views in Wiring Systems

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G400

Rear chassis harness components ground, on the right frame rail near the park brake pump

Power and Grounding Component Views in Wiring Systems

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P100

At the lower left corner of the bulkhead

Harness Routing Views in Wiring Systems

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S101

In the engine harness, 20 cm (8 in) from the generator breakout toward the fuel injector breakout

Harness Routing Views in Wiring Systems

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S102

In the engine harness, 27 cm (11 in) from the fuel injector breakout toward the generator breakout

Harness Routing Views in Wiring Systems

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S110

In the breakout for the PCM connectors, 10 cm (4 in) from the main engine harness

Harness Routing Views in Wiring Systems

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S112

In the engine harness, 7 cm (3 in) from the breakout for the PCM toward the breakout for the generator

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--

S122

In the engine harness, 7 cm (3 in) from the breakout to the engine wiring harness junction block (underhood fuse relay center)

Harness Routing Views in Wiring Systems

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S150

Body Builder Installed

--

--

S152

Forward lamp harness, 5 cm (2 in) from the RH headlamp breakout toward C100

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--

S153

Forward lamp harness, 9 cm (4 in) from the LH headlamp breakout toward the RH headlamp breakout

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--

S154

Forward lamp harness, 5 cm (2 in) from the LH headlamp breakout toward C100

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--

S155

In the forward lamp harness, approximately 25 cm (10 in) from the LH outer headlamp

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--

S200

In the IP harness, 7 cm (3 in) toward the IP wiring harness junction block from the breakout for C201

Harness Routing Views in Wiring Systems

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S201

In the IP harness, 11 cm (4 in) toward the IP wiring harness junction block from the breakout for the transmission range control

Harness Routing Views in Wiring Systems

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S202

In the IP harness, 16 cm (6 in) toward the IP wiring harness junction block from the breakout for the transmission range control

Harness Routing Views in Wiring Systems

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S207

In the IP harness, 25 cm (1 in) toward the stoplamp switch breakout from the transmission range control breakout

Harness Routing Views in Wiring Systems

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S208

In the IP harness, 4 cm (2 in) toward the stoplamp switch breakout from the transmission range control breakout

Harness Routing Views in Wiring Systems

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S209

In the IP harness, 8 cm (3 in) toward the stoplamp switch breakout from the transmission range control breakout

Harness Routing Views in Wiring Systems

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S211

In the IP harness, on the breakout to the transmission range control, 18 cm (7 in) from the main harness

Harness Routing Views in Wiring Systems

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S215

In the IP harness, on the breakout to the steering column connector, 17 cm (7 in) from the main harness

Harness Routing Views in Wiring Systems

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S216

In the IP harness, on the breakout to the steering column connector, 14 cm (6 in) from the main harness

Harness Routing Views in Wiring Systems

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S217

In the IP harness, on the breakout to the steering column connector, 12 cm (5 in) from the main harness

Harness Routing Views in Wiring Systems

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S219

In the IP harness, on the breakout to the steering column connector, 7 cm (3 in) from the main harness

Harness Routing Views in Wiring Systems

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S221

In the IP harness, 9 cm (3 in) toward the speedometer adapter module from the transmission range control breakout

Harness Routing Views in Wiring Systems

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S222

In the IP harness, 5 cm (2 in) toward the fuse block from the stoplamp switch breakout

Harness Routing Views in Wiring Systems

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S223

In the IP harness stoplamp switch breakout, 30 cm (12 in) from the main harness

Harness Routing Views in Wiring Systems

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S225

In the IP harness, 3 cm (1 in) toward the fuse block from the stoplamp switch breakout

Harness Routing Views in Wiring Systems

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S226

In the IP harness, 6 cm (2 in) toward the fuse block from the stoplamp switch breakout

Harness Routing Views in Wiring Systems

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S227

In the IP harness breakout for the fuse block, 28 cm (11 in) from the breakout for C202 and C203

Harness Routing Views in Wiring Systems

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S231

In the IP harness breakout for the fuse block, 54 cm (21 in) from the breakout for C202 and C203

Harness Routing Views in Wiring Systems

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S233

In the IP extension harness, 30 cm (12 in) toward the headlamp switch, from the main harness

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--

S234

In the IP extension harness, 19 cm (7 in) from the instrument cluster connector

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--

S235

In the IP extension harness, 12 cm (5 in) from the instrument cluster connector

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--

S236

In the IP harness, on the breakout to the steering column connector, 9 cm (4 in) from the main harness

Harness Routing Views in Wiring Systems

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S401

In the rear chassis harness, 100 cm (39 in) forward of the breakout for the fuel pump

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--

S407

In the rear chassis harness, 22 cm (9 in) rear of the breakout for the LH rear heated oxygen sensor

Harness Routing Views in Wiring Systems

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S500

In the RH marker light branch of the tail and stoplamp harness, 5 cm (2 in) from the breakout to the RH taillamp

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--

S501

In the LH marker light branch of the tail and stoplamp harness, 5 cm (2 in) from the breakout to the LH taillamp

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--

S502

In the tail and stoplamp harness, 110 cm (43 in) from the connectors to the rear chassis harness

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--

S503

In the tail and stoplamp harness, 100 cm (39 in) from the connectors to the rear chassis harness

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--

S504

In the tail and stoplamp harness, 12 cm (4 in) from the connectors to the rear chassis harness

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