GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

Electronic Brake Control Module (EBCM) (JE5)

On a bracket, on the left side, upper exterior bulkhead, on the top of the air brake application valve

Air Antilock Brake System Component Views in Air Antilock Brake Systems

Air Antilock Brake System Connector End Views in Air Antilock Brake Systems

C1 (30 cavities)

In the electronic brake control harness, to the EBCM

Air Antilock Brake System Component Views in Air Antilock Brake Systems

Air Antilock Brake System Connector End Views in Air Antilock Brake Systems

C2 (18 cavities)

In the electronic brake control harness, to the EBCM

Air Antilock Brake System Component Views in Air Antilock Brake Systems

Air Antilock Brake System Connector End Views in Air Antilock Brake Systems

Electronic Brake Control Module (EBCM) (JE3)

On the inboard side of the left frame rail, to the rear of number one crossmember, on the bracket

Antilock Brake System Component Views in Antilock Brake Systems

Antilock Brake System Connector End Views in Antilock Brake Systems

C1 (2 cavities)

In the electronic brake control harness, to the EBCM

Antilock Brake System Component Views in Antilock Brake Systems

Antilock Brake System Connector End Views in Antilock Brake Systems

C2 (24 cavities)

In the electronic brake control harness, to the EBCM

Antilock Brake System Component Views in Antilock Brake Systems

Antilock Brake System Connector End Views in Antilock Brake Systems

Engine Exhaust (EE) Brake Solenoid Valve

On the left rear side of the back-of-the-cab crossmember

Engine Exhaust Brake Component Views

Engine Exhaust Brake Connector End Views

Engine Exhaust (EE) Brake Switch

On the center of the IP

Engine Exhaust Brake Component Views

Engine Exhaust Brake Connector End Views

Exhaust Brake/ Air Interlock Relay

In the flasher/ relay center, position 2-B

Engine Exhaust Brake Component Views

Engine Exhaust Brake Connector End Views

Powertrain Control Module (PCM) (LG5)

On the left rear side of the engine block

Engine Controls Component Views in Engine Controls-7.2L (Caterpillar®)

Engine Controls Connector End Views in Engine Controls-7.2L (Caterpillar®)

Powertrain Control Module (PCM) (LP4/L21)

Under the left front cowel in front of driver

Engine Controls Component Views in Engine Controls-7.4L

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Powertrain Control Module (PCM) - C1 (LP4/L21) (32 cavities)

Under the left front cowel in front of driver

Engine Controls Component Views in Engine Controls-7.4L

Engine Controls Connector End Views in Engine Controls-7.4L

Powertrain Control Module (PCM) - C2 (LP4/L21) (24 cavities)

Under the left front cowel in front of driver

Engine Controls Component Views in Engine Controls-7.4L

Engine Controls Connector End Views in Engine Controls-7.4L

C107 (7 cavities) (JE5)

In the IP harness, to the chassis jumper harness (ABS-Air), approximately 33 cm  (13 in) from P100

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Inline Harness Connector End Views in Wiring Systems

C112 (2 cavities) (LG5)

In the engine harness, to the engine exhaust brake harness, near the frame rail, by the starter

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Inline Harness Connector End Views in Wiring Systems

C200 (56 cavities) (LG5)

In the IP harness, to the engine harness, under the right side of the IP

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Inline Harness Connector End Views in Wiring Systems

C200 (56 cavities) (LP4/L21)

In the IP harness, to the engine harness, under the right side of the IP

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Inline Harness Connector End Views in Wiring Systems

C202 (6 cavities) (LG5)

In the IP harness, to the IP-to-chassis jumper harness (ABS-air), under the IP, on the right side of the steering column

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Inline Harness Connector End Views in Wiring Systems

C202 (6 cavities) (LP4/L21)

In the IP harness, to the IP-to-chassis jumper harness (ABS-air), under the IP, on the right side of the steering column

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Inline Harness Connector End Views in Wiring Systems

G101 (LG5)

From the starter motor end ground stud (G101) to the right frame rail ground (G100)

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P100

On the right side of the bulkhead

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P103

On the left side of the bulkhead

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S142 (LP4/L21)

In the engine harness, approximately 4 cm (2 in) from the throttle position (TP) sensor, toward the breakout

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S142 (LG5)

In the engine harness, approximately 4 cm (2 in)

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S220

In the IP harness, approximately 15 cm (6 in) to the right of the data link connector (DLC) breakout

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S221

In the IP harness, approximately 12 cm (5 in) to the right of the data link connector (DLC) breakout

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S250 (LG5, JE5)

In the IP harness, approximately 16 cm (6 in) from the exhaust brake/ air interlock relay connector, by the Underhood Fuse block/ mini-relay center

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S252 (LG5)

In the IP harness, approximately 9 cm (4 in) from Underhood fuse block 1, toward the flasher/ relay center

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