Diagnostic Routine B

Diagnostic Routine B

Diagnostic Overview

No Power in ACC - Vehicles with an Ignition Switch

Refer to Wiring Diagram Set 13 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

When in ACC mode, the ignition switch sends voltage to the BCM (Body Control Module). The BCM (Body Control Module) then sends out an ignition status message on the MS-CAN (Medium Speed Controller Area Network).

DTC Fault Trigger Conditions






Pinpoint Test

1. CHECK FOR ACC VOLTAGE AT THE BCM (Body Control Module)

1. Ignition OFF.

2. Disconnect: BCM (Body Control Module) C2280C.

3. Ignition ACC.

4. Measure:





Is the voltage greater than 11 volts?






2. CHECK THE IGNITION ACC CIRCUIT FOR AN OPEN

1. Ignition OFF.

2. Disconnect: Ignition Switch.

3. Measure:





Is the resistance less than 3 ohms?






3. CHECK FOR CORRECT BCM (Body Control Module) OPERATION

1. Disconnect and inspect all BCM (Body Control Module) connectors.

2. Repair:

- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

3. Reconnect the BCM (Body Control Module) connectors and all previously disconnected exterior system connectors. Make sure they seat and latch correctly.

4. Operate the system and determine if the concern is still present.

Is the concern still present?