Can C Diagnostic (+) and/or Can C Diagnostic (-) circuits high

CAN C DIAGNOSTIC (+) AND/OR CAN C DIAGNOSTIC (-) CIRCUITS HIGH





For complete wiring diagram refer to the wiring section.

WHEN MONITORED
When the scan tool queries the FCM.

SET CONDITION
The scan tool has detected a shorted high condition on either or both CAN C Diagnostic circuits.

POSSIBLE CAUSES
- (D52) CAN C diagnostic (+) circuit shorted to voltage
- (D51) CAN C diagnostic (-) circuit shorted to voltage
- Front control module

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.
- Ensure the scan tool is updated to the latest software.

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.

Q: 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. CAN C DIAGNOSTIC CIRCUITS SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the Front Control Module C1 harness connector.
Disconnect the scan tool from the DLC.
Turn the ignition on.
Measure the voltage of the CAN C Diagnostic circuits.

Q: Is the voltage above 6.0 volts for either circuit?

YES: Repair the CAN C Diagnostic circuits for a short to voltage. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: 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. Body Verification Test