Diagnostic Test
VERIFY THE DTC IS ACTIVE
NOTE:
For vehicle communication problems, use the scan tool to refer to the Network Review Screen. The screen depicts a high level view of the vehicle network. Fault and problem areas appear in red. Selecting any of the network components allows access to the source of the problem.
- Turn the ignition on.
- With a scan tool, select View DTCs.
Is the DTC active at this time?
Yes
- Perform the U0001-CAN C BUS circuit diagnostic procedure. Refer to DTC INDEX - EXCEPT 500L .
No
- Perform the STORED LOST COMMUNICATION DTCS diagnostic procedure. Refer to DIAGNOSIS AND TESTING .