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Inspection and Verification

NOTE: If a new ABS module is installed, it must be configured and calibrated. For module configuration, refer to Programmable Module Installation (PMI) in MODULE CONFIGURATION SYSTEM article. For module calibration, connect the scan tool and proceed to IVD Initialization sequence.
  1. Verify the customer concern.
  2. Verify the stoplamps operate correctly by applying and releasing the brake pedal. If the stoplamps do not operate correctly, refer to EXTERIOR LIGHTING SYSTEM article. If the stoplamps operate correctly, proceed to the next step.
  3. Verify that the PRNDL operates correctly on the IC. If the PRNDL does not operate correctly, refer to INFORMATION CENTER - INSTRUMENTATION AND WARNING CHIMES article. If the PRNDL operates correctly, proceed to the next step.
  4. Visually inspect for obvious signs of mechanical or electrical damage.
    VISUAL INSPECTION CHART

    Mechanical Electrical
    • Wheel speed sensor ring
    • Hydraulic Control Unit (HCU)
    • Tire pressure
    • Mismatched wheels or tires on vehicle
    • Base brake system
    • Steering components, suspension components and tire size
    • ABS module
    • Battery Junction Box (BJB) fuse(s):
      • 17 (40A)
      • 33 (30A)
    • Brake fluid level switch
    • Restraints Control Module (RCM)
    • Smart Junction Box (SJB) fuse 20 (10A)
    • Stability/traction control switch
    • Steering wheel rotation sensor
    • Stoplamp switch
    • Wheel speed sensors
    • Wiring, terminals or connectors
  5. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
    6. NOTE: Make sure to use the latest scan tool software release.
  6. If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).
    7. NOTE: The Vehicle Communication Module (VCM) LED prove out confirms power and ground from the DLC are provided to the VCM.
  7. If the scan tool does not communicate with the VCM:
    • check the VCM connection to the vehicle.
    • check the scan tool connection to the VCM.
    • refer to MODULE COMMUNICATIONS NETWORK article, No Power To The Scan Tool, to diagnose no power to the scan tool.
  8. If the scan tool does not communicate with the vehicle:
    • verify the ignition is ON.
    • verify the scan tool operation with a known good vehicle.
    • refer to MODULE COMMUNICATIONS NETWORK article to diagnose no response from the PCM.
  9. Carry out the network test.
    • If the scan tool responds with no communication for one or more modules, refer to MODULE COMMUNICATIONS NETWORK article.
    • If the network test passes, retrieve and record Continuous Memory Diagnostic Trouble Codes (CMDTCs).
  10. Clear the continuous DTCs and carry out the self-test diagnostics for the ABS module.
  11. If the DTCs retrieved are related to the concern, go to ABS MODULE DTC CHART . For all other DTCs, refer to the Master DTC Chart in MULTIFUNCTION ELECTRONIC MODULES article.
  12. If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART .
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