Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET2005CHEVY EXPRESS G3500, VAN PASSENGER, LQ4REPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSWIRING DIAGRAMSOEM CONNECTOR END VIEWSENGINE CONTROLS CONNECTOR END VIEWS (4.3L)IGNITION CONTROL MODULE (ICM) CONNECTOR END VIEW

2005 Chevrolet Chevy Express G3500, Van Passenger, LQ4

Ignition Control Module (ICM) Connector End View

2005 Chevrolet Chevy Express G3500, Van Passenger, LQ4SECTION Ignition Control Module (ICM) Connector End View

Ignition Control Module (ICM)

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15355331 4-Way F GT 150 Series Sealed 3.2 x 4.0 (BK)
Pin	Wire Color	Circuit No.	Function
A	PK	139	Ignition 1 Voltage
B	WH	423	IC Timing Control
C	BK	1250	Ground
D	WH/BK	1847	Ignition Coil Control

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.