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Pinpoint Test N: The Anti-Lock Brake System (Abs) Warning Indicator Is Never/Always On

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
  1. N1 CARRY OUT THE INSTRUMENT CLUSTER INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Active Command
    • Enter the instrument cluster active command mode and select ABS_LAMP. 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  N6.
  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 .
    2. NO  : Go to  N3.
  3. N3 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND INSTRUMENT CLUSTER SELF-TESTS 
    • Check for recorded instrument cluster DTCs from the continuous and on-demand self-tests.
    • Are any DTCs recorded? 
    1. YES  : For DTC U0121, go to  N4.

      For all other DTCs, REFER to INSTRUMENT CLUSTER DTC CHART .

    2. NO  : Go to  N5.
  4. N4 CARRY OUT THE INSTRUMENT CLUSTER SELF-TEST 
    • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Self-Test
    • Clear the DTCs. Repeat the instrument cluster self-test.
    • Is DTCs U0121 present? 
    1. YES  : REFER to MODULE COMMUNICATIONS NETWORK article to diagnose no communication with the ABS module.
    2. NO  : VERIFY the ABS warning indicator is operating correctly at this time. The concern may have resulted from an intermittent network concern.
  5. N5 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 . 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.
  6. N6 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect the instrument cluster connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the instrument cluster 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. 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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