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 mechanical or electrical damage.VISUAL INSPECTION
Mechanical Electrical - Headlamp(s) condition and installation
- Bulb(s) condition and installation
- Bulb holder(s) condition and installation
- Lighting control switch condition and installation
- Steering column left multifunction switch condition and installation
- Fuses
- Relays
- Wiring harness
- Loose or corroded connector(s)
- Battery Junction Box (BJB)
- Central Junction Box (CJB)
- Headlamp Leveling Control Module (HLCM)
- Xenon Bulb Control Modules (XBCM)
- Instrument Cluster (IC)
- Steering Angle Sensor Module (SASM)
- Transmission Control Module (TCM)
- Engine Control Module (ECM)
- Anti-lock Brake System (ABS) control module
- Air Suspension Control module
- Local Interconnect Network (LIN) circuits
- Controller Area Network (CAN) circuits
- 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, verify the symptom and refer to the Symptom Chart, alternatively check for Diagnostic Trouble Codes (DTCs) and refer to the relevant DTC Index.