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Pinpoint Test N: The ABS Warning Indicator Is Never/Always On

Normal Operation 

The status of the ABS system is sent to the instrument cluster (IC) from the ABS module over the high speed controller area network (HS-CAN) communication bus. The instrument cluster (IC) monitors the ABS input and illuminates the ABS warning indicator when a concern is present.

If the ABS message is missing for less than 5 seconds, the ABS warning indicator remains in the last indication mode (on or off). If the ABS message is missing for more than 5 seconds, the instrument cluster (IC) sets DTC U0121 in continuous memory and defaults the ABS and brake warning indicators on.

NOTE: If the brake system experiences an electronic brake distribution (EBD) failure, both the brake warning indicator and the ABS warning indicators illuminate.

This pinpoint test is intended to diagnose the following:

PINPOINT TEST N: THE ABS WARNING INDICATOR IS NEVER/ALWAYS ON 

  1. N1 CARRY OUT THE INSTRUMENT CLUSTER (IC) INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster (IC) DataLogger
    • Select the instrument cluster (IC) ABS warning indicator (ABS_LAMP) active command and command the ABS warning indicator on and off. Observe the ABS warning indicator.
    • Does the ABS warning indicator illuminate when commanded on, and turn off when commanded off? 
    1. YES  : Go to  N2.
    2. NO  : Go to  N5.
  2. N2 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND ABS MODULE SELF-TESTS 
    • Check for recorded ABS module DTCs from the continuous and on-demand self-tests.
    • Are any ABS module DTCs recorded? 
    1. YES  : REFER to VEHICLE DYNAMIC SYSTEMS article.
    2. NO  : Go to  N3.
  3. N3 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND INSTRUMENT CLUSTER (IC) SELF-TESTS 
    • Check for recorded instrument cluster (IC) DTCs from the continuous and on-demand self-tests.
    • Are any DTCs recorded? 
    1. YES  : For DTC U0121, go to Pinpoint Test AH  .

      For all other DTCs, REFER to appropriate DTC Chart in this service information.

    2. NO  : Go to  N4.
  4. N4 CHECK FOR CORRECT ABS MODULE OPERATION 
    • Disconnect the ABS module connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the ABS module connector and make sure it seats correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new ABS module. REFER to VEHICLE DYNAMIC SYSTEMS article. TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
  5. N5 CHECK FOR CORRECT INSTRUMENT CLUSTER (IC) OPERATION 
    • Disconnect the instrument cluster (IC) connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the instrument cluster (IC) connector and make sure it seats correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new instrument cluster (IC). REFER to Instrument Cluster (IC) . TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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