No Response From BCM (Body Control Module)

*NO RESPONSE FROM BCM (BODY CONTROL MODULE)





For a complete wiring diagram refer to Diagrams/Electrical.





Diagnostic Test

1. PCI BUS COMMUNICATION AND TEST FOR INTERMITTENT CONDITION

Turn the ignition on.

NOTE: Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.

With the scan tool, select ECU view.

NOTE: A red X will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.

Does the scan tool display a red X next to the module?

Yes

- Go To 2

No

- The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.

2. (Z943) (Z944) GROUND CIRCUIT OPEN





Turn the ignition off.

Remove the Body Control Module from the Junction Block.

Using a 12-volt test light connected to 12-volts, probe each (Z943) and (Z944) ground circuit.

Does the test light illuminate brightly for each circuit?

Yes

- Go To 3

No

- Repair the appropriate ground circuit for an open between the Junction Block and the common grounding point. If OK, replace the Junction Block.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

3. (A213) (A908) FUSED B(+) CIRCUIT OPEN





Using a 12-volt test light connected to ground, probe the (A213) and (A908) Fused B(+) circuit.

Does the test light illuminate brightly for each circuit?

Yes

- Go To 4

No

- Check all Junction Block and PDC fuses. If OK, replace the Junction Block.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

4. (F98) (F942) FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN





Turn the ignition on.

Using a 12-volt test light connected to ground, probe the (F98) and (F942) Fused Ignition Switch Output circuit.

Does the test light illuminate brightly?

Yes

- Go To 5

No

- Check all Junction Block and PDC fuses. If OK, replace the Junction Block.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

5. (D25) PCI BUS CIRCUIT OPEN





Turn the ignition off.

Disconnect the scan tool from the DLC connector.

Disconnect the Body Control Module C1 harness connector.

Measure the resistance of the (D25) PCI Bus circuit between the DLC and the Body Control Module connector.

Is the resistance below 5.0 ohms?

Yes

- Replace the Body Control Module.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Repair the (D25) PCI Bus circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test