Inspection And Verification
CAUTION:
Diagnosis by substitution from a donor vehicle is NOT
acceptable. Substitution of control modules does not guarantee confirmation of a fault and may also cause additional faults in the vehicle being checked and/or the donor vehicle.
NOTE:
Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.
- Verify the customer concern.
- Visually inspect for obvious signs of damage.
- With the ignition on, check the operation of the audio output from the instrument cluster integrated speakers by operating the turn signal indicators (left and right) and verifying that audible feedback (a ticking sound) is present.
VISUAL INSPECTION
ELECTRICAL - Battery
- Fuses
- Wiring harness
- Damaged, loose or corroded connectors
- Controller Area Network (CAN) circuits
- Instrument Cluster (IPC)
- Central Junction Box (CJB)
- Engine Control Module (ECM)
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- If the cause is not visually evident, check for Diagnostic Trouble Codes (DTCs) and refer to the appropriate Diagnostic Trouble Code (DTC) Index information.