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

For a complete wiring diagram Refer to Section 8W.

When Monitored:
When the scan tool queries the FCM.
Set Condition:
The scan tool has detected an open condition on both Diagnostic CAN C circuits.

Possible Causes

(D72) DIAGNOSTIC CAN C (+) CIRCUIT OPEN

(D71) DIAGNOSTIC CAN C (-) CIRCUIT OPEN

FRONT CONTROL MODULE

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.

Does the scan tool display this same error message?

Yes

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

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

Is the resistance below 5.0 ohms?

Yes

Repair the (D72) Diagnostic CAN C (+) circuit for an open.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

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

Is the resistance below 5.0 ohms?

Yes

Inspect the wiring and connectors for damage or shorted circuits. If ok, replace the Front Control Module in accordance with the service information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Repair the (D71) Diagnostic CAN C (-) circuit for an open.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).