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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 tested and/or the donor vehicle.
NOTE: If the control module or a component is suspect and the vehicle remains under manufacturer warranty, refer to the Warranty Policy and Procedures., or determine if any prior approval program is in operation, prior to the installation of a new module/component.
  1. Verify the customer concern.
  2. Visually inspect for obvious signs of damage and system integrity.

    VISUAL INSPECTION CHART 

    MECHANICAL ELECTRICAL
    • Transfer case
    • Propshafts
    • Differentials
    • Halfshafts
    • Fluid leaks
    • Fuse(s)
    • Relays
    • Wiring harnesses and connectors
    • High/Low range sensor
    • FlexRay network circuits
    • Instrument Cluster (IC)
    • High/low range switch
    • Transfer Case Control Module (TCCM)
  3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step
  4. 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 DTC Index
  5. Check DDW for open campaigns. Refer to the corresponding bulletins and SSMs which may be valid for the specific customer complaint and carry out the recommendations as required
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