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 - Tire size, condition and installation
- Wheel speed sensor condition and installation
- Steering Angle Sensor Module (SASM) condition and installation
- Yaw rate sensor and accelerometer condition and installation
- Hydraulic control unit (with attached anti-lock brake system control module) condition and installation
- Fuses
- Harnesses and connectors
- Warning indicator operation
- Wheel speed sensors
- Central Junction Box (CJB)
- Hill Descent Control (HDC) switch
- Dynamic Stability Control (DSC) switch
- Brake pedal switch
- Yaw rate sensor and accelerometer
- Steering Angle Sensor Module (SASM)
- Anti-lock Brake System control module (ABS)
- 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, check for Diagnostic Trouble Codes (DTCs) and refer to the appropriate Diagnostic Trouble Code (DTC) Index information.