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Pinpoint Test D: The Headlamps Are On Continuously

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
  1. D1 DETERMINE IF THE HIGH BEAMS ARE ILLUMINATED 
    • Key in OFF position.
    • Place the headlamp switch in the HEADLAMPS ON position.
    • Place the multifunction switch in the FLASH-TO-PASS position while observing the headlamps.
    • Does the headlamp brightness increase? 
    1. YES  : Go to  D7.
    2. NO  : Go to  D2.
  2. D2 CHECK THE MULTIFUNCTION SWITCH 
    • Disconnect: Multifunction Switch C202c
    • Do the high beam headlamps continue to illuminate? 
    1. YES  : Go to  D3.
    2. NO  : INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES article. CLEAR the DTCs. REPEAT the self-test.
  3. D3 CHECK CIRCUITS 1337 (VT/YE) AND 1335 (YE/WH) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: LCM C2145c
    • Do the high beam headlamps continue to illuminate? 
    1. YES  : For police vehicles, go to  D4 .

      For all others, REPAIR circuit 1337 (VT/YE) (LH high beam) or circuit 1335 (YE/WH) (RH high beam). CLEAR the DTCs. REPEAT the self-test.

    2. NO  : Go to  D5.
  4. D4 CHECK CIRCUITS 1337 (VT/YE) AND 1335 (YE/WH) FOR A SHORT TO VOLTAGE (POLICE VEHICLES) 
    • Key in OFF position.
    • Disconnect: Wig-Wag Module C1352 or C1365
    • Key in ON position.
    • Do the high beam headlamps continue to illuminate? 
    1. YES  : REPAIR circuit 1337 (VT/YE) (LH high beam) or circuit 1335 (YE/WH) (RH high beam). CLEAR the DTCs. REPEAT the self-test.
    2. NO  : INSTALL a new wig-wag module. CLEAR the DTCs. REPEAT the self-test.
  5. D5 CHECK CIRCUIT 12 (LG/BK) FOR A SHORT TO GROUND 
    • Place the headlamp switch in the OFF position.
    • Disconnect: LCM C2145d
      • Fig 1: Checking Circuit For Short To Ground
      GF0014538Courtesy of FORD MOTOR CO.
    • Measure the resistance between the multifunction switch C202c-10, circuit 12 (LG/BK), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  D6.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  6. D6 CHECK CIRCUIT 12 (LG/BK) FOR A SHORT TO VOLTAGE 
    • Key in ON position.
      • Fig 2: Checking Circuit For Short To Voltage
      GF0014539Courtesy of FORD MOTOR CO.
    • Measure the voltage between the multifunction switch C202c-10, circuit 12 (LG/BK), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  D16.
  7. D7 CHECK THE LCM HEADLAMP SWITCH PIDs 
    • Place the headlamp switch in the OFF position.
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: LCM DataLogger
    • Monitor the LCM headlamp switch status PIDs (HD_LMP_SW) while moving the headlamp switch through all positions.
    • Do the headlamp switch PIDs agree with the headlamp switch position? 
    1. YES  : For non-police vehicles, go to  D8 .

      For police vehicles, go to  D11.

    2. NO  : Go to  D12.
  8. D8 CHECK THE LCM WINDSHIELD WIPER MOTOR PID 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: LCM DataLogger
    • Monitor the LCM windshield wiper motor status PID (WPRMTRST1).
    • Does the PID indicate the windshield wiper motor is active? 
    1. YES  : Go to  D9.
    2. NO  : Go to  D11.
  9. D9 CHECK THE WINDSHIELD WIPER MOTOR 
    • Key in OFF position.
    • Disconnect: Windshield Wiper Motor C125
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: LCM DataLogger
    • Monitor the LCM windshield wiper motor status PID (WPRMTRST1).
    • Does the PID indicate the windshield wiper motor is active? 
    1. YES  : Go to  D10.
    2. NO  : INSTALL a new windshield wiper motor. REFER to WIPERS & WASHERS article. CLEAR the DTCs. REPEAT the self-test.
  10. D10 CHECK CIRCUIT 28 (BK/PK) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: LCM C2145d
      • Fig 3: Checking Circuit For Short To Ground
      GF0014540Courtesy of FORD MOTOR CO.
    • Measure the resistance between the LCM C2145d-14, circuit 28 (BK/PK), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  D16.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  11. D11 CHECK CIRCUITS 160 (DB/WH) AND 161 (DG/OG) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: LCM C2145c and C2145d
    • Key in ON position.
    • Do the low beam headlamps continue to illuminate? 
    1. YES  : REPAIR circuit 160 (DB/WH) (LH low beam) or circuit 161 (DG/OG) (RH low beam). CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  D16.
  12. D12 CHECK THE HEADLAMP SWITCH 
    • Key in OFF position.
    • Disconnect: Headlamp Switch C205a
    • Carry out the headlamp switch component test. Refer to COMPONENT TESTING article.
    • Is the headlamp switch OK? 
    1. YES  : Go to  D13.
    2. NO  : INSTALL a new headlamp switch. REFER to Headlamp Switch . CLEAR the DTCs. REPEAT the self-test.
  13. D13 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Headlamp Switch C205a
      • Fig 4: Checking Circuit For Open
      GF0014541Courtesy of FORD MOTOR CO.
    • Measure the resistance between the headlamp switch C205a-7, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  D14.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  14. D14 CHECK THE HEADLAMP SWITCH INPUT CIRCUITS FOR AN OPEN 
    • Disconnect: LCM C2145a and C2145b
    • Measure the resistance between the headlamp switch, harness side and the LCM, harness side as follows:
      Headlamp Switch Connector-Pin LCM Connector-Pin Circuit
      C205a-4 (if equipped with autolamps) C2145a-15 220 (VT/OG)
      C205a-9 C2145b-2 1400 (TN/WH)
      C205a-5 C2145a-9 1032 (WH/BK)
      C205a-10 C2145a-3 1033 (RD/YE)
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  D15.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  15. D15 CHECK THE HEADLAMP SWITCH INPUT CIRCUITS FOR A SHORT TO GROUND 
    • Measure the resistance between the headlamp switch, harness side and ground as follows:
      Headlamp Switch Connector-Pin Circuit
      C205a-4 (if equipped with autolamps) 220 (VT/OG)
      C205a-10 1033 (RD/YE)
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  D16.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  16. D16 CHECK FOR CORRECT LCM OPERATION 
    • Key in OFF position.
    • Disconnect all the LCM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the LCM 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 LCM. REFER to MULTIFUNCTION ELECTRONIC MODULES article. 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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