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Pinpoint Test F: The Headlamps Are On Continuously

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. F1 DETERMINE IF THE HIGH BEAMS ARE ALWAYS ON 
    • Key in ON position.
    • While observing the headlamps, engage the flash-to-pass feature.
    • Does the headlamp brightness increase? 
    1. YES  : Go to  F2.
    2. NO  : Go to  F13.
  2. F2 USE THE RECORDED DTCs FROM THE SJB SELF-TEST (LOW BEAMS ALWAYS ON) 
    • Using the recorded results from the SJB self-test:
    • Was DTC B1470 recorded? 
    1. YES  : Go to  F3.
    2. NO  : Go to  F8.
  3. F3 CHECK THE SJB HEADLAMP SWITCH PIDs 
    • Enter the following diagnostic mode on the diagnostic tool: SJB DataLogger
      • NOTE: Make sure the headlamp switch is correctly lined up (in a detent position) when checking each PID.
    • Monitor the SJB headlamp switch (HD_LMP_SW, P_LMP_SW, LAMP_SW) PIDs while moving the headlamp switch through all positions.
    • Do the headlamp switch positions agree with the PIDs? 
    1. YES  : The system is operating correctly. The concern may have been caused by the headlamp switch between detent positions.
    2. NO  : Go to  F4.
  4. F4 CHECK CIRCUIT 1205 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Headlamp Switch C205
      • Fig 1: Measuring Resistance Between Headlamp Switch C205-7 And Ground
      GF0016110Courtesy of FORD MOTOR CO.
    • Measure the resistance between the headlamp switch C205-7, circuit 1205 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  F5.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  5. F5 CHECK THE HEADLAMP SWITCH 
    • Carry out the headlamp switch component test. Refer to COMPONENT TESTING.
    • Is the headlamp switch OK? 
    1. YES  : Go to  F6.
    2. NO  : INSTALL a new headlamp switch. REFER to Headlamp Switch . CLEAR the DTCs. REPEAT the self-test.
  6. F6 CHECK THE HEADLAMP SWITCH INPUT CIRCUITS FOR A SHORT TO GROUND 
    • Disconnect: SJB C2280b
      • Fig 2: Checking Headlamp Switch Input Circuits For A Short To Ground
      GF0046541Courtesy of FORD MOTOR CO.
    • Measure the resistance between the headlamp switch, harness side and ground as follows:
      Headlamp Switch Connector-Pin Circuit
      C205-9 1400 (TN/WH)
      C205-5 1401 (BK/LG)
      C205-10 1402 (RD/WH)
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  F7.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  7. F7 CHECK THE HEADLAMP SWITCH INPUT CIRCUITS FOR AN OPEN 
    • Measure the resistance between the headlamp switch, harness side and the SJB, harness side as follows:
      Headlamp Switch Connector-Pin SJB Connector-Pin Circuit
      C205-9 C2280b-27 1400 (TN/WH)
      C205-5 C2280b-31 1401 (BK/LG)
      C205-10 C2280b-46 1402 (RD/WH)
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  F21.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  8. F8 CHECK THE SJB 
    • Key in OFF position.
    • Disconnect: SJB C2280d
    • Key in ON position.
    • Does either headlamp continue to illuminate? 
    1. YES  : Go to  F9.
    2. NO  : Go to  F21.
  9. F9 CHECK CIRCUITS 1336 (LG/WH) AND 1338 (WH) FOR A SHORT TO VOLTAGE (SJB TO BEC) 
    • Key in OFF position.
    • Disconnect: BEC C1035a
    • Key in ON position.
    • Does either headlamp continue to illuminate? 
    1. YES  : Go to  F10.
    2. NO  : REPAIR circuit 1338 (WH) (LH headlamp) or circuit 1336 (LG/WH) (RH headlamp). CLEAR the DTCs. REPEAT the self-test.
  10. F10 CHECK CIRCUITS 1336 (LG/WH) AND 1338 (WH) FOR A SHORT TO VOLTAGE (BEC TO HEADLAMP) (HALOGEN HEADLAMPS) 
    • Key in OFF position.
    • Disconnect: BEC C1035c
    • Key in ON position.
    • Does either headlamp continue to illuminate? 
    1. YES  : For halogen headlamps, REPAIR circuit 1338 (WH) (LH headlamp) or circuit 1336 (LG/WH) (RH headlamp). CLEAR the DTCs. REPEAT the self-test.

      For HID headlamps, go to  F11.

    2. NO  : INSTALL a new BEC. CLEAR the DTCs. REPEAT the self-test.
  11. F11 CHECK CIRCUITS 2008 (PK/BK) AND 2009 (PK/WH) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: Suspect HID Relay
    • Key in ON position.
    • Does the headlamp in question continue to illuminate? 
    1. YES  : REPAIR circuit 2008 (PK/BK) (LH headlamp) or circuit 2009 (PK/WH) (RH headlamp). TEST the system for normal operation.
    2. NO  : Go to  F12.
  12. F12 CHECK CIRCUITS 1336 (LG/WH) AND 1338 (WH) FOR A SHORT TO VOLTAGE (BEC TO HEADLAMP) (HID HEADLAMPS) 
      Fig 3: Checking Circuits 1336 (LG/WH) & 1338 (WH) For A Short To Voltage (BEC To Headlamp) (HID Headlamps) - 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 4: Checking Circuits 1336 (LG/WH) & 1338 (WH) For A Short To Voltage (BEC To Headlamp) (HID Headlamps) - 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 any voltage present? 
    1. YES  : REPAIR circuit 1338 (WH) (LH headlamp) or circuit 1336 (LG/WH) (RH headlamp). CLEAR the DTCs. REPEAT the self-test.
    2. NO  : INSTALL a new HID relay. TEST the system for normal operation.
  13. F13 USE THE RECORDED DTCs FROM THE SJB SELF-TEST (HIGH BEAMS ALWAYS ON) 
    • Retrieve the recorded results from the SJB self-test.
    • Was DTC B2586 or B2598 recorded? 
    1. YES  : For DTC B2586, go to  F14.

      For DTC B2598, go to  F17.

    2. NO  : Go to  F19.
  14. F14 CHECK THE MULTIFUNCTION SWITCH 
    • Key in OFF position.
    • Disconnect: Multifunction Switch C202
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: SJB Self-Test
    • Clear the SJB DTCs. Repeat the SJB on-demand self-test.
    • Is DTC B2586 still present? 
    1. YES  : Go to  F15.
    2. NO  : INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES . CLEAR the DTCs. REPEAT the self-test.
  15. F15 CHECK CIRCUITS 1394 (WH/RD) AND 1395 (RD/PK) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: SJB C2280b
      • Fig 5: Measuring Resistance Between SJB C2280B-45, SJB C2280B-40 & Ground
      GF0016111Courtesy of FORD MOTOR CO.
    • Measure the resistance between the SJB C2280b-45, circuit 1394 (WH/RD), harness side and ground; and between the SJB C2280b-40, circuit 1395 (RD/PK), harness side and ground.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  F16.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  16. F16 CHECK CIRCUITS 1394 (WH/RD) AND 1395 (RD/PK) FOR A SHORT TO CIRCUIT 1396 (VT/WH) 
      Fig 6: Measuring Resistance Between SJB C2280B-45, SJB C2280B-4, SJB C2280B-40 & SJB C2280B-4
      GF0016112Courtesy of FORD MOTOR CO.
    • Measure the resistance between the SJB C2280b-45, circuit 1394 (WH/RD), harness side and the SJB C2280b-4, circuit 1396 (VT/WH), harness side; and between the SJB C2280b-40, circuit 1395 (RD/PK), harness side and the SJB C2280b-4, circuit 1396 (VT/WH), harness side.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  F21.
    2. NO  : REPAIR the circuits in question. CLEAR the DTCs. REPEAT the self-test.
  17. F17 CHECK THE SJB HIGH BEAM CONTROL 
    • Disconnect: SJB C2280c
    • Key in ON position.
    • Do the headlamps continue to illuminate? 
    1. YES  : Go to  F18.
    2. NO  : Go to  F21.
  18. F18 CHECK CIRCUIT 1708 (LG/BK) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: BEC C1035a
    • Key in ON position.
    • Do the headlamps continue to illuminate? 
    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.
  19. F19 CHECK THE HIGH BEAM RELAY 
    • Disconnect: High Beam Relay
    • Key in ON position.
    • Do the headlamps continue to illuminate? 
    1. YES  : Go to  F20.
    2. NO  : INSTALL a new high beam relay. TEST the system for normal operation.
  20. F20 CHECK CIRCUITS 1335 (YE/WH) AND 1337 (VT/YE) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: BEC C1035c
    • Key in ON position.
    • Does either headlamp continue to illuminate? 
    1. YES  : REPAIR circuit 1337 (VT/YE) (LH headlamp) or circuit 1335 (YE/WH) (RH headlamp). TEST the system for normal operation.
    2. NO  : INSTALL a new BEC. TEST the system for normal operation.
  21. F21 CHECK FOR CORRECT SJB OPERATION 
    • Key in OFF position.
    • 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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