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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 31 (Exterior Lighting System) >> Diagnostic Tests >> Headlamps >> Pinpoint Tests >> Pinpoint Test D: One Low Beam Headlamp Is Inoperative - High Intensity Discharge (HID) Headlamps >> Pinpoint Test D: One Low Beam Headlamp Is Inoperative - High Intensity Discharge (Hid) Headlamps

Pinpoint Test D: One Low Beam Headlamp Is Inoperative - High Intensity Discharge (Hid) 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.
  1. D1 CHECK THE HID RELAY 
    • Key in OFF position.
    • Disconnect: Suspect HID Relay
    • Substitute a known good relay and recheck the low beam operation.
    • Does the headlamp in question illuminate? 
    1. YES  : REMOVE the known good relay. INSTALL a new HID relay in question. TEST the system for normal operation.
    2. NO  : REMOVE the known good relay. Go to  D2.
  2. D2 CHECK THE HEADLAMP GROUND CIRCUIT 
    • 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 C1284-2, circuit 1205 (BK), harness side and ground; or between the RH headlamp C1285-2, circuit 1205 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  D5.
    2. NO  : Go to  D3.
  3. D3 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 C1284-2, circuit 1205 (BK), harness side and the BEC C1035c-D5, circuit 1205 (BK), harness side; or between the RH headlamp C1285-2, 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  D4.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  4. D4 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.
  5. D5 CHECK FOR VOLTAGE TO THE HEADLAMP 
    • Connect: Suspect HID Relay
    • Place the headlamp switch in the HEADLAMPS ON position.
      • Fig 4: Checking Voltage To Inoperative Headlamp Bulb
      GF0004583Courtesy of FORD MOTOR CO.
    • Measure the voltage the LH headlamp C1284-1, circuit 2008 (PK/WH) (PK/BK for 5.4L), harness side and ground; or between the RH headlamp C1285-1, circuit 2009 (PK/WH), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  D17.
    2. NO  : Go to  D6.
  6. D6 CHECK THE HID RELAY GROUND CIRCUIT 
    • Place the headlamp switch in the OFF position.
    • Disconnect: Suspect HID Relay
      • Fig 5: Checking HID Relay Ground Circuit - 4.0L Or 4.6L
      GF0046532Courtesy of FORD MOTOR CO.
    • For 4.0L or 4.6L vehicles, measure the resistance between the LH HID relay pin 1, circuit 1205 (BK), harness side and ground; or between the RH HID relay pin 1, circuit 1205 (BK), harness side and ground.
      • Fig 6: Checking HID Relay Ground Circuit - 5.4L
      GF0046533Courtesy of FORD MOTOR CO.
    • For 5.4L vehicles, measure the resistance between the LH HID relay pin 2, circuit 1205 (BK), harness side and ground; or between the RH HID relay pin 2, circuit 1205 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  D8.
    2. NO  : Go to  D7.
  7. D7 CHECK CIRCUIT 1205 (BK) FOR AN OPEN (HID RELAY TO BEC) 
    • Disconnect: BEC C1035c
    • Measure the resistance between the suspect HID relay pin, harness side and the BEC, harness side as follows:
      HID Relay Pin BEC Connector-Pin Circuit
      4.0L or 4.6L 
      LH HID relay pin 1 C1035c-F3 1205 (BK)
      RH HID relay pin 1 C1035c-F10 1205 (BK)
      5.4L 
      LH HID relay pin 2 C1035c-F3 1205 (BK)
      RH HID relay pin 2 C1035c-F10 1205 (BK)
    • 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.
  8. D8 CHECK CIRCUIT 1336 (LG/WH) OR CIRCUIT 1338 (WH) FOR VOLTAGE 
    • Place the headlamp switch in the HEADLAMPS ON position.
      • Fig 7: Checking Circuit 1336 (LG/WH) Or Circuit 1338 (WH) For Voltage - 4.0L Or 4.6L
      GF0046534Courtesy of FORD MOTOR CO.
    • For 4.0L or 4.6L vehicles, measure the voltage between the LH HID relay pin 2, circuit 1338 (WH), harness side and ground; or between the RH HID relay pin 2, circuit 1336 (LG/WH), harness side and ground.
      • Fig 8: Checking Circuit 1336 (LG/WH) Or Circuit 1338 (WH) For Voltage - 5.4L
      GF0046535Courtesy of FORD MOTOR CO.
    • For 5.4L vehicles, measure the voltage between the LH HID relay pin 1, circuit 1338 (WH), harness side and ground; or between the RH HID relay pin 1, circuit 1336 (LG/WH), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  D15.
    2. NO  : Go to  D9.
  9. D9 CHECK CIRCUIT 1336 (LG/WH) OR CIRCUIT 1338 (WH) FOR A SHORT TO GROUND 
    • Place the headlamp switch in the OFF position.
    • Disconnect: SJB C2280d
      • Fig 9: Checking Circuit 1336 (LG/WH) Or Circuit 1338 (WH) For A Short To Ground - 4.0L Or 4.6L
      GF0046536Courtesy of FORD MOTOR CO.
    • For 4.0L or 4.6L vehicles, measure the resistance between the LH HID relay pin 2, circuit 1338 (WH), harness side and ground; or between the RH HID relay pin 2, circuit 1336 (LG/WH), harness side and ground.
      • Fig 10: Checking Circuit 1336 (LG/WH) Or Circuit 1338 (WH) For A Short To Ground - 5.4L
      GF0046537Courtesy of FORD MOTOR CO.
    • For 5.4L vehicles, measure the resistance between the LH HID relay pin 1, circuit 1338 (WH), harness side and ground; or between the RH HID relay pin 1, circuit 1336 (LG/WH), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  D12.
    2. NO  : Go to  D10.
  10. D10 CHECK CIRCUIT 1336 (LG/WH) OR CIRCUIT 1338 (WH) FOR A SHORT TO GROUND (SJB TO BEC) 
    • Disconnect: BEC C1035a
      • Fig 11: Checking Circuit 1336 (LG/WH) Or Circuit 1338 (WH) For A Short To Ground (SJB To BEC) - 4.0L Or 4.6L
      GF0046536Courtesy of FORD MOTOR CO.
    • For 4.0L or 4.6L vehicles, measure the resistance between the LH HID relay pin 2, circuit 1338 (WH), harness side and ground; or between the RH HID relay pin 2, circuit 1336 (LG/WH), harness side and ground.
      • Fig 12: Checking Circuit 1336 (LG/WH) Or Circuit 1338 (WH) For A Short To Ground (SJB To BEC) - 5.4L
      GF0046537Courtesy of FORD MOTOR CO.
    • For 5.4L vehicles, measure the resistance between the LH HID relay pin 1, circuit 1338 (WH), harness side and ground; or between the RH HID relay pin 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  D11.
  11. D11 CHECK CIRCUIT 1336 (LG/WH) OR CIRCUIT 1338 (WH) FOR A SHORT TO GROUND (BEC TO HEADLAMP) 
    • Disconnect: BEC C1035c
      • Fig 13: Checking Circuit 1336 (LG/WH) Or Circuit 1338 (WH) For A Short To Ground (BEC To Headlamp) - 4.0L Or 4.6L
      GF0046536Courtesy of FORD MOTOR CO.
    • For 4.0L or 4.6L vehicles, measure the resistance between the LH HID relay pin 2, circuit 1338 (WH), harness side and ground; or between the RH HID relay pin 2, circuit 1336 (LG/WH), harness side and ground.
      • Fig 14: Checking Circuit 1336 (LG/WH) Or Circuit 1338 (WH) For A Short To Ground (BEC To Headlamp) - 5.4L
      GF0046537Courtesy of FORD MOTOR CO.
    • For 5.4L vehicles, measure the resistance between the LH HID relay pin 1, circuit 1338 (WH), harness side and ground; or between the RH HID relay pin 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.
  12. D12 CHECK CIRCUIT 1336 (LG/WH) OR CIRCUIT 1338 (WH) FOR AN OPEN (BEC TO HID RELAY) 
    • Disconnect: BEC C1035c
    • Measure the resistance between the suspect HID relay pin, harness side and the BEC, harness side as follows:
      HID Relay Pin BEC Connector-Pin Circuit
      4.0L or 4.6L 
      LH HID relay pin 2 C1035c-A6 1338 (WH)
      RH HID relay pin 2 C1035c-A2 1336 (LG/WH)
      5.4L 
      LH HID relay pin 1 C1035c-A6 1338 (WH)
      RH HID relay pin 1 C1035c-A2 1336 (LG/WH)
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  D13.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  13. D13 CHECK FOR VOLTAGE TO THE BEC 
    • Disconnect: BEC C1035a
    • Place the headlamp switch in the HEADLAMPS ON position.
      • Fig 15: Checking 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  D14.
  14. D14 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 16: Checking Circuit 1336 (LG/WH) Or Circuit 1338 (WH) For An Open (SJB To BEC) - Inoperative LH Headlamp
      GF0046530Courtesy of FORD MOTOR CO.
    • For an inoperative LH headlamp, measure the resistance between the BEC C1035a-F6, circuit 1338 (WH), harness side and the SJB C2280d-51, circuit 1338 (WH), harness side.
      • Fig 17: Checking Circuit 1336 (LG/WH) Or Circuit 1338 (WH) For An Open (SJB To BEC) - Inoperative RH Headlamp
      GF0046531Courtesy of FORD MOTOR CO.
    • For an inoperative RH headlamp, measure the resistance between the BEC C1035a-F2, 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  D19.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  15. D15 CHECK CIRCUIT 1055 (WH/LG) OR CIRCUIT 1056 (DB/LG) FOR VOLTAGE 
    • Place the headlamp switch in the OFF position.
      • Fig 18: Checking Circuit 1055 (WH/LG) Or Circuit 1056 (DB/LG) For Voltage - 4.0L Or 4.6L
      GF0046538Courtesy of FORD MOTOR CO.
    • For 4.0L or 4.6L vehicles, measure the voltage between the LH HID relay pin 3, circuit 1055 (WH/LG), harness side and ground; or between the RH HID relay pin 3, circuit 1056 (DB/LG), harness side and ground.
      • Fig 19: Checking Circuit 1055 (WH/LG) Or Circuit 1056 (DB/LG) For Voltage - 5.4L
      GF0046539Courtesy of FORD MOTOR CO.
    • For 5.4L vehicles, measure the voltage between the LH HID relay pin 3, circuit 1055 (WH/LG), harness side and ground; or between the RH HID relay pin 3, circuit 1056 (DB/LG), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : REPAIR circuit 2008 (PK/WH) (PK/BK for 5.4L) (LH headlamp) or circuit 2009 (PK/WH) (RH headlamp) for an open.
    2. NO  : Go to  D16.
  16. D16 CHECK CIRCUIT 1055 (WH/LG) OR CIRCUIT 1056 (DB/LG) FOR AN OPEN 
    • Disconnect: BEC C1035c
    • Measure the resistance between the suspect HID relay pin, harness side and the BEC, harness side as follows:
      HID Relay Pin BEC Connector-Pin Circuit
      4.0L or 4.6L 
      LH HID relay pin 3 C1035c-B8 1055 (WH/LG)
      RH HID relay pin 3 C1035c-A9 1056 (DB/LG)
      5.4L 
      LH HID relay pin 3 C1035c-B8 1055 (WH/LG)
      RH HID relay pin 3 C1035c-A9 1056 (DB/LG)
    • 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 in question. CLEAR the DTCs. REPEAT the self-test.
  17. D17 CHECK THE HEADLAMP HARNESS 
    • Place the headlamp switch in the OFF position.
    • Inspect the headlamp harness for an open between the ballast and the vehicle harness connector.
    • Is the headlamp harness OK? 
    1. YES  : Go to  D18.
    2. NO  : REPAIR or INSTALL a new headlamp assembly. REFER to Headlamp Assembly . TEST the system for normal operation.
  18. D18 CHECK THE BALLAST 
    • Substitute a known good ballast.
    • Connect: Inoperative Headlamp
    • Place the headlamp switch in the HEADLAMPS ON position.
    • Does the inoperative headlamp now illuminate? 
    1. YES  : INSTALL a new ballast. REFER to Headlamp Assembly . TEST the system for normal operation.
    2. NO  : INSTALL a new HID bulb. REFER to Headlamp Bulb . TEST the system for normal operation.
  19. D19 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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