Diagnostic Test
- VERIFY DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE NOTE: Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.
- With the scan tool, read active SCM DTCs.
Is this DTC active?
Yes
- Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure and perform the U0155-Lost Communication with Cluster/CCN diagnostic procedure.
No
- Refer to Non-DTC Diagnostics/Communication - Diagnosis and Testing and perform the Stored Lost Communication DTC diagnostic procedure.
- With the scan tool, read active SCM DTCs.