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Pinpoint Test C: One Low Beam Headlamp Is Inoperative - Halogen Headlamps

WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Make sure the bulb is good before continuing diagnostics.
  1. C1 CHECK THE HEADLAMP GROUND CIRCUIT 
    • Key in OFF position.
    • Disconnect: Inoperative Headlamp
      • Fig 1: Measuring Resistance Between LH Headlamp C1021-2, Circuit 1205 (BK), Harness Side & Ground
      GF0016102Courtesy of FORD MOTOR CO.
    • Measure the resistance between the LH headlamp C1021-2, circuit 1205 (BK), harness side and ground; or between the RH headlamp C1041-2, circuit 1205 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  C4.
    2. NO  : Go to  C2.
  2. C2 CHECK CIRCUIT 1205 (BK) FOR AN OPEN (HEADLAMP TO BEC) 
    • Disconnect: BEC C1035c
      • Fig 2: Checking Circuit 1205 (BK) For Open (Headlamp To BEC)
      GF0016103Courtesy of FORD MOTOR CO.
    • Measure the resistance between the LH headlamp C1021-2, circuit 1205 (BK), harness side and the BEC C1035c-D5, circuit 1205 (BK), harness side; or between the RH headlamp C1041-2, circuit 1205 (BK), harness side and the BEC C1035c-D11, circuit 1205 (BK), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  C3.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  3. C3 CHECK CIRCUIT 1205 (BK) FOR AN OPEN (BEC TO GROUND) 
      Fig 3: Checking Circuit 1205 (BK) For Open (BEC To Ground)
      GF0016104Courtesy of FORD MOTOR CO.
    • Measure the resistance between the BEC C1035c-F5 (LH headlamp), circuit 1205 (BK), harness side and ground; or between the BEC C1035c-E11 (RH headlamp), circuit 1205 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new BEC. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  4. C4 CHECK CIRCUIT 1336 (LG/WH) OR CIRCUIT 1338 (WH) FOR A SHORT TO GROUND 
    • Disconnect: SJB C2280d
      • Fig 4: Checking Circuit 1336 (LG/WH) Or Circuit 1338 (WH) For Short To Ground
      GF0016105Courtesy of FORD MOTOR CO.
    • Measure the resistance between the LH headlamp C1021-1, circuit 1338 (WH), harness side and ground; or between the RH headlamp C1041-1, circuit 1336 (LG/WH), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  C7.
    2. NO  : Go to  C5.
  5. C5 CHECK CIRCUIT 1336 (LG/WH) OR CIRCUIT 1338 (WH) FOR A SHORT TO GROUND (SJB TO BEC) 
    • Disconnect: BEC C1035a
      • Fig 5: Checking Circuit 1336 (LG/WH) Or Circuit 1338 (WH) For Short To Ground
      GF0016105Courtesy of FORD MOTOR CO.
    • Measure the resistance between the LH headlamp C1021-1, circuit 1338 (WH), harness side and ground; or between the RH headlamp C1041-1, circuit 1336 (LG/WH), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  C6.
  6. C6 CHECK CIRCUIT 1336 (LG/WH) OR CIRCUIT 1338 (WH) FOR A SHORT TO GROUND (BEC TO HEADLAMP) 
    • Disconnect: BEC C1035c
      • Fig 6: Checking Circuit 1336 (LG/WH) Or Circuit 1338 (WH) For Short To Ground
      GF0016105Courtesy of FORD MOTOR CO.
    • Measure the resistance between the LH headlamp C1021-1, circuit 1338 (WH), harness side and ground; or between the RH headlamp C1041-1, circuit 1336 (LG/WH), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : INSTALL a new BEC. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  7. C7 CHECK CIRCUIT 1336 (LG/WH) OR CIRCUIT 1338 (WH) FOR AN OPEN (BEC TO HEADLAMP) 
    • Disconnect: BEC C1035c
      • Fig 7: Checking Circuit 1336 (LG/WH) Or Circuit 1338 (WH) For Open (BEC To Headlamp)
      GF0016106Courtesy of FORD MOTOR CO.
    • Measure the resistance between the BEC C1035c-A6, circuit 1338 (WH), harness side and the LH headlamp C1021-1, circuit 1338 (WH), harness side; or between the BEC C1035c-A2, circuit 1336 (LG/WH), harness side and the RH headlamp C1041-1, circuit 1336 (LG/WH), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  C8.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  8. C8 CHECK FOR VOLTAGE TO THE BEC 
    • Disconnect: BEC C1035a
    • Connect: SJB C2280d
    • Place the headlamp switch in the HEADLAMPS ON position.
      • Fig 8: Check For Voltage To BEC
      GF0046529Courtesy of FORD MOTOR CO.
    • Measure the voltage between the BEC C1035a-F6 (LH headlamp), circuit 1338 (WH), harness side and ground; or between the BEC C1035a-F2 (RH headlamp), circuit 1336 (LG/WH), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : INSTALL a new BEC. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  C9.
  9. C9 CHECK CIRCUIT 1336 (LG/WH) OR CIRCUIT 1338 (WH) FOR AN OPEN (SJB TO BEC) 
    • Place the headlamp switch in the OFF position.
    • Disconnect: SJB C2280d
      • Fig 9: Measuring Resistance Between BEC C1035A-F6 (LH Headlamp), Circuit 1338 (WH), Harness Side & SJB C2280D-51
      GF0046530Courtesy of FORD MOTOR CO.
    • Measure the resistance between the BEC C1035a-F6 (LH headlamp), circuit 1338 (WH), harness side and the SJB C2280d-51, circuit 1338 (WH), harness side.
      • Fig 10: Measuring Resistance Between BEC C1035A-F2 (RH Headlamp), Circuit 1336 (LG/WH), Harness Side & SJB C2280D-48
      GF0046531Courtesy of FORD MOTOR CO.
    • Measure the resistance between the BEC C1035a-F2 (RH headlamp), circuit 1336 (LG/WH), harness side and the SJB C2280d-48, circuit 1336 (LG/WH), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  C10.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  10. C10 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? 
    1. YES  : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES . 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. CLEAR the DTCs. REPEAT the self-test.
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