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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 a control module or a component is suspect and the vehicle remains under manufacturer warranty, refer to the Warranty Policy and Procedures manual, or determine if any prior approval program is in operation, prior to the installation of a new module/component.
  • When performing voltage or resistance tests, always use a digital multimeter that has the resolution ability to view 3 decimal places. For example, on the 2 volts range can measure 1mV or 2 K Ohm range can measure 1 Ohm. When testing resistance always take the resistance of the digital multimeter leads into account.
  • Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.
  • When diagnosing steering faults if issues are found to be due to interfacing system issues, e.g. anti-lock brake system, park aid, suspension, battery/charging system, etc, ensure warranty is claimed against the interfacing system where the problem is identified not steering gear.
  1. Verify the customer concern
    • If a road test is necessary make sure the vehicle is safe to do so
  2. Using guidance from the symptom chart, and the symptoms defined in the electrical service diagnostic tool
  3. Visually inspect for obvious signs of mechanical or electrical damage

    VISUAL INSPECTION CHART 

    MECHANICAL ELECTRICAL
    • Check the tires for correct pressure, size, wear and tread pattern
    • Check for wheel rim and tire damage
    • Check road wheel security
    • Check for vehicle or suspension damage
    • Check steering ball joints and suspension components for abnormally high friction
    • Fuses
    • Wiring harnesses and connectors
    • Power steering control module
    • Steering angle sensor module
  4. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step
  5. If the cause is not visually evident, verify the symptom with the customer and refer to the approved dealer diagnostic tool. Alternatively check symptoms against symptom chart below and check DTCs as appropriate and refer to the DTC index
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