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Home >> Ford >> 2005 >> Escape Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1408 (Exterior Lighting System) >> Diagnosis And Testing >> Headlamps >> Pinpoint Tests >> Pinpoint Test B: One Low Beam Headlamp Is Inoperative >> Pinpoint Test B: One Low Beam Headlamp Is Inoperative

Pinpoint Test B: One Low Beam Headlamp Is Inoperative

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Due to varying wattage ratings and resulting current draw of certain aftermarket headlamp bulbs, the SJB  may activate its short circuit protection strategy, resulting in the low beam output circuit(s) becoming inoperative. Verify that the bulbs meet Ford specifications. If the bulbs do not meet Ford specifications, install the correct bulbs. Clear the DTCs and run the on-demand self-test (required to reset the SJB  ). Correct any unresolved DTCs. Test the system for normal operation.
  1. B1 USE THE RECORDED DTCs FROM THE SJB SELF-TEST 
    • Check the recorded results from the SJB  self-test.
    • Is DTC B2A2E or DTC B2A30 present? 
    • Yes:  GO to B2  .
    • No:  VERIFY the SJB  fuse 7 (10A) (LH low beam) or fuse 8 (10A) (RH low beam) is OK. If OK, GO to  B4.

      If not OK, REFER to the appropriate SYSTEM WIRING DIAGRAMS article to identify the possible causes of the circuit short. After the repair:

      If no DTCs are present, TEST the system for normal operation.

      If DTC B106E is present, CLEAR the DTCs and  REPEAT the self-test (required to enable the low beam output driver if DTC B106E is present  ). TEST the system for normal operation.

      If DTC B106F is present, INSTALL a new SJB  . REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.

  2. B2 CHECK FOR VOLTAGE TO THE INOPERATIVE HEADLAMP 
    • Ignition OFF.
    • Disconnect: Inoperative Headlamp.
    • Place the headlamp switch in the HEADLAMPS ON position.
    • Measure the voltage between the LH headlamp C1021-1, circuit CLF04 (BN/BU), harness side and ground; or between the RH headlamp C1041-1, circuit CLF05 (BU/GN), harness side and ground.
      Fig 1: Checking Voltage To Inoperative Headlamp
      G06099124Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes:  REPAIR circuit GD120 (BK/GN) for an open. CLEAR the DTCs. REPEAT the self-test.
    • No:  GO to B3  .
  3. B3 CHECK THE SJB HEADLAMP VOLTAGE SUPPLY CIRCUIT FOR AN OPEN 
    • Place the headlamp switch in the OFF position.
    • Disconnect: SJB  C2280e.
    • Measure the resistance between the LH headlamp C1021-1, circuit CLF04 (BN/BU), harness side and the SJB  C2280e-13, circuit CLF04 (BN/BU), harness side; or between the RH headlamp C1041-1, circuit CLF05 (BU/GN), harness side and the SJB  C2280e-4, circuit CLF05 (BU/GN), harness side.
      Fig 2: Checking SJB Headlamp Voltage Supply Circuit For An Open
      G06383460Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to  B5.
    • No:  REPAIR circuit CLF04 (BN/BU) (LH headlamp) or circuit CLF05 (BU/GN) (RH headlamp) for an open. CLEAR the DTCs. REPEAT the self-test.
  4. B4 REPEAT THE ON-DEMAND SELF-TEST AND CHECK FOR VOLTAGE TO THE HEADLAMP 
    • Ignition OFF.
    • Disconnect: Inoperative Headlamp.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: SJB  Self-Test.
    • Clear the DTCs and repeat the on-demand self-test (required to enable the low beam output driver if DTC B106E is present). 
    • Place the headlamp switch in the HEADLAMPS ON position.
    • Measure the voltage between the LH headlamp C1021-1, circuit CLF04 (BN/BU), harness side and ground; or between the RH headlamp C1041-1, circuit CLF05 (BU/GN), harness side and ground.
      Fig 3: Checking Voltage To Inoperative Headlamp
      G06099124Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes:  INSTALL a new headlamp bulb. REFER to HEADLAMP BULB . TEST the system for normal operation.
    • No:  GO to B5  .
  5. B5 CHECK THE SJB LOW BEAM OUTPUT CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: SJB  C2280e.
    • Measure the resistance between the LH headlamp C1021-1, circuit CLF04 (BN/BU), harness side and ground; or between the RH headlamp C1041-1, circuit CLF05 (BU/GN), harness side and ground.
      Fig 4: Checking SJB Low Beam Output Circuit For Short To Ground
      G06065216Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to B6  .
    • No:  REPAIR circuit CLF04 (BN/BU) (LH low beam) in question for a short to ground. After the repair:

      If no DTCs are present, TEST the system for normal operation.

      If DTC B106E is present, CLEAR the DTCs and  REPEAT the self-test (required to enable the low beam output driver if DTC B106E is present)  . TEST the system for normal operation.

      If DTC B106F is present, INSTALL a new SJB  . REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.

  6. B6 CHECK FOR CORRECT SJB OPERATION 
    • Disconnect all the SJB  connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the SJB  connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes:  INSTALL a new SJB  . REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
    • 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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