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Pinpoint Test Aa: DTC B1A98:88

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
  1. AA1 ISOLATE THE LH HEADLAMP ASSEMBLY AS THE CAUSE OF THE DTC 
    • Ignition OFF.
    • Disconnect: LH Headlamp Assembly C1021.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: HCM Self-Test.
      • NOTE: Other DTCs can be present with the headlamp assembly disconnected and should be ignored.
    • Clear the DTCs and repeat the HCM self-test.
    • Is DTC B1A98:88 still present? 
    1. Yes  : GO to AA2.
    2. No  : INSTALL a new LH headlamp assembly. REFER to HEADLAMP ASSEMBLY  in this service information. CLEAR the DTCs. REPEAT the self-test.
  2. AA2 ISOLATE THE RH HEADLAMP ASSEMBLY AS THE CAUSE OF THE DTC 
    • Ignition OFF.
    • Disconnect: RH Headlamp Assembly C1041.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: HCM Self-Test.
      • NOTE: Other DTCs can be present with the headlamp assembly disconnected and should be ignored.
    • Clear the DTCs and repeat the HCM self-test.
    • Is DTC B1A98:88 still present? 
    1. Yes  : GO to AA3.
    2. No  : INSTALL a new RH headlamp assembly. REFER to HEADLAMP ASSEMBLY  in this service information. CLEAR the DTCs. REPEAT the self-test.
  3. AA3 CHECK THE COMMUNICATION CIRCUITS TO THE HEADLAMPS FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: HCM C1600.
    • Ignition ON.
    • Measure the voltage between the HCM C1600-17, circuit VLF32 (YE), harness side, and ground; and the HCM C1600-18, circuit VLF33 (BU), harness side, and ground.
      Fig 1: Measuring Voltage Between HCM C1600-17, Circuit VLF32 (YE), Harness Side, And Ground
      G06257406Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. Yes  : REPAIR circuit VLF32 (YE) (LH headlamp) or circuit VLF33 (BU) (RH headlamp) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
    2. No  : GO to AA4.
  4. AA4 CHECK THE COMMUNICATION CIRCUITS TO THE HEADLAMPS FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between the HCM C1600-17, circuit VLF32 (YE), harness side, and ground; and the HCM C1600-18, circuit VLF33 (BU), harness side, and ground.
      Fig 2: Measuring Resistance Between HCM C1600-17, Circuit VLF32 (YE), Harness Side, And Ground
      G06257407Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. Yes  : GO to AA5.
    2. No  : REPAIR circuit VLF32 (YE) (LH headlamp) or circuit VLF33 (BU) (RH headlamp) for a short to ground. CLEAR the DTCs. REPEAT the self-test.
  5. AA5 CHECK FOR CORRECT HCM OPERATION 
    • Disconnect all the HCM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the HCM connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. Yes  : INSTALL a new HCM. REFER to HEADLAMP CONTROL MODULE (HCM)  in this service information. 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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