Both Diagnostic CAN C (+) and Diagnostic CAN C (-) Circuits Open

*BOTH DIAGNOSTIC CAN C (+) AND DIAGNOSTIC CAN C (-) CIRCUITS OPEN





For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
When the scan tool queries the BCM.

- Set Condition:
The scan tool has detected an open condition on both Diagnostic CAN C circuits.





Diagnostic Test

1. CHECK THE STATUS OF THE ERROR MESSAGE

NOTE: Ensure the vehicle being tested is a CAN BUS VEHICLE. If not, false error messages may be displayed.

NOTE: Ensure the scan tool is updated to the latest software.

NOTE: Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.

With the scan tool, record the error message.
Disconnect the scan tool from the DLC.
Cycle the ignition from on to off 3 times.
Turn the ignition on.
Does the scan tool display this same error message?

Yes

- Go To 2

No

- The conditions that caused this error message to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.

2. (D72) DIAGNOSTIC CAN C (+) CIRCUIT OPEN




Turn the ignition off.
Disconnect the BCM C4 harness connector.
Disconnect the scan tool from the DLC.

NOTE: Check the connectors at both the DLC and the BCM.

Measure the resistance of the (D72) Diagnostic CAN C (+) circuit between the BCM C4 harness connector and the DLC.
Is the resistance below 5.0 ohms?

Yes

- Go To 3

No

- Repair the (D72) Diagnostic CAN C (+) circuit for an open.
- Perform the BODY VERIFICATION TEST - VER 1.Body Verification Test.

3. (D71) DIAGNOSTIC CAN C (-) CIRCUIT OPEN




Measure the resistance of the (D71) Diagnostic CAN C (-) circuit between the BCM C4 harness connector and the DLC.
Is the resistance below 5.0 ohms?

Yes

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace the Body Control Module.
- Perform the BODY VERIFICATION TEST - VER 1.Body Verification Test.

No

- Repair the (D71) Diagnostic CAN C (-) circuit for an open.
- Perform the BODY VERIFICATION TEST - VER 1.Body Verification Test.