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Pinpoint Test E: The Headlamps Are On Continuously

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
  1. E1 DETERMINE THE ALWAYS ON HEADLAMP(S) 
    NOTE: Make sure the multifunction switch is in the low beam position.
    • Key in ON position.
    • Place the headlamp switch in the OFF position.
    • Observe the headlamps.
    • Is only one lamp illuminated? 
    • Yes  : GO to  E2.
    • No  : GO to  E10.
  2. E2 RETRIEVE THE FEM DIAGNOSTIC TROUBLE CODES (DTCs) 
    • Key in OFF position.
    • Connect the diagnostic tool.
    • Key in ON position.
    • Carry out the FEM on-demand self-test.
    • Are any DTCs present? 
    • Yes  : If DTC B1567, GO to  E3.

      If DTC B1794, GO to  E5.

      All others, REFER to the FEM DIAGNOSTIC TROUBLE CODE (DTC) INDEX  for correct diagnostics.

    • No  : If not equipped with HID headlamps, GO to  E24.

      If equipped with HID headlamps, GO to  E7.

  3. E3 CHECK THE FEM (HIGH BEAM) 
    • Key in OFF position.
    • Disconnect: FEM C201a.
    • Does the LH or RH high beam continue to illuminate? 
    • Yes  : GO to  E4.
    • No  : GO to  E24.
  4. E4 CHECK CIRCUIT 31S-LE15 (BK/GN) OR 31S-LE22 (BK/RD) FOR A SHORT TO GROUND 
    • Disconnect: LH Headlamp C1021 or RH Headlamp C1041.
    • Measure the resistance between LH headlamp C1021-6, circuit 31S-LE15 (BK/GN), harness side and ground; or between RH headlamp C1041-6, circuit 31S-LE22 (BK/RD), harness side and ground.
      Fig 1: Measuring Resistance Between LH Headlamp C1021-6, Circuit 31S-LE15 (BK/GN) And Ground
      G03998561Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : REPAIR the circuit in question. CLEAR the DTCs. TEST the system for normal operation.
    • No  : REPAIR or INSTALL a new headlamp assembly. REFER to HEADLAMP ASSEMBLY  in this article. TEST the system for normal operation.
  5. E5 CHECK THE FEM (HALOGEN LOW BEAM) 
    • Key in OFF position.
    • Disconnect: FEM C201a.
    • Does the LH or RH low beam continue to illuminate? 
    • Yes  : GO to  E6.
    • No  : GO to  E24.
  6. E6 CHECK CIRCUIT 31S-LE16 (BK/RD) OR 31S-LE23 (BK/WH) FOR A SHORT TO GROUND 
    • Disconnect: LH Headlamp C1021 or RH Headlamp C1041.
    • Measure the resistance between LH headlamp C1021-4, circuit 31S-LE16 (BK/RD), harness side and ground; or between RH headlamp C1041-4, circuit 31S-LE23 (BK/WH), harness side and ground.
      Fig 2: Measuring Resistance Between LH Headlamp C1021-4, Circuit 31S-LE16 (BK/RD) And Ground
      G03998562Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : REPAIR the circuit in question. CLEAR the DTCs. TEST the system for normal operation.
    • No  : REPAIR or INSTALL a new headlamp assembly. REFER to HEADLAMP ASSEMBLY  in this article. TEST the system for normal operation.
  7. E7 CHECK THE FEM (HID LOW BEAM) 
    • Key in OFF position.
    • Disconnect: FEM C201a.
    • Does the LH or RH low beam continue to illuminate? 
    • Yes  : GO to  E8.
    • No  : GO to  E24.
  8. E8 CHECK CIRCUIT 91S-LE16 (BN/YE) OR CIRCUIT 91S-LE23 (BN/WH) FOR A SHORT TO GROUND 
    • Disconnect: LH HID Relay C1379 or RH HID Relay C1380.
    • Measure the resistance between LH HID relay C1379-2, circuit 91S-LE16 (BN/YE), harness side and ground; or between RH HID relay C1380-2, circuit 91S-LE23 (BN/WH), harness side and ground
      Fig 3: Measuring Resistance Between LH HID Relay C1379-2, Circuit 91S-LE16 And Ground; Or Between RH HID Relay C1380-2, Circuit 91S-LE23 And Ground
      G03890478Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : REPAIR the circuit in question. TEST the system for normal operation.
    • No  : GO to  E9.
  9. E9 CHECK THE HID RELAY 
    • Carry out the HID relay component test. Refer to COMPONENT TESTING for component testing.
    • Is the HID relay OK? 
    • Yes  : REPAIR circuit 30S-LE16 (RD/BK) (LH headlamp) or circuit 30S-LE23 (RD/WH) (RH headlamp). TEST the system for normal operation.
    • No  : INSTALL a new HID relay. TEST the system for normal operation.
  10. E10 DETERMINE IF LOW BEAMS OR HIGH BEAMS ARE ILLUMINATED 
    • Key in OFF position.
    • Observe the headlamps.
    • Are the high beam headlamps illuminated? 
    • Yes  : GO to  E11.
    • No  : GO to  E12.
  11. E11 MONITOR THE HIGH BEAM STATUS 
    • Key in OFF position.
    • Connect the diagnostic tool.
    • Key in ON position.
    • Monitor the instrument cluster high beam input status PID while moving the multifunction switch from the low beam to high beam positions.
    • Does the PID agree with the positions of the multifunction switch? 
    • Yes  : GO to  E24.
    • No  : INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES . TEST the system for normal operation.
  12. E12 MONITOR THE HEADLAMP SWITCH STATUS 
    • Key in OFF position.
    • Connect the diagnostic tool.
    • Key in ON position.
    • Monitor the instrument cluster headlamp switch status PID while rotating the knob from the OFF position to the headlamps ON position.
    • Does the PID agree with the positions of the headlamp switch? 
    • Yes  : GO to  E24.
    • No  : GO to  E13.
  13. E13 CHECK THE HEADLAMP SWITCH 
    • Key in OFF position.
    • Disconnect: Headlamp Switch C205.
    • Carry out the headlamp switch component test. Refer to COMPONENT TESTING for component testing.
    • Is the headlamp switch OK? 
    • Yes  : GO to  E14.
    • No  : INSTALL a new headlamp switch. REFER to HEADLAMP SWITCH  in this article. TEST the system for normal operation.
  14. E14 CHECK CIRCUIT 8-LE21 (WH/GN) FOR AN OPEN OR A SHORT TO GROUND 
    • Disconnect: Instrument Cluster C220c.
    • Measure the resistance between headlamp switch C205-10, circuit 8-LE21 (WH/GN), harness side and instrument cluster C220c-10, circuit 8-LE21 (WH/GN), harness side; and between headlamp switch C205-10, circuit 8-LE21 (WH/GN), harness side and ground.
      Fig 4: Measuring Resistance Between Headlamp Switch C205-10, Circuit 8-LE21 And Instrument Cluster C220C-10 Circuit 8-LE21; And Between Headlamp Switch C205-10, Circuit 8-LE21 And Ground
      G03998564Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the headlamp switch and the instrument cluster; and greater than 10,000 ohms between the headlamp switch and ground? 
    • Yes  : GO to  E15.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  15. E15 CHECK CIRCUIT 8-LE21 (WH/GN) FOR A SHORT TO POWER 
    • Key in ON position.
    • Measure the voltage between headlamp switch C205-10, circuit 8-LE21 (WH/GN), harness side and ground.
      Fig 5: Measuring Voltage Between Headlamp Switch C205-10, Circuit 8-LE21 (WH/GN) And Ground
      G03998565Courtesy of FORD MOTOR CO.
    • Is the any voltage present? 
    • Yes  : REPAIR the circuit. TEST the system for normal operation.
    • No  : GO to  E16.
  16. E16 CHECK CIRCUIT 8-LF14 (WH/BU) FOR AN OPEN OR A SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between headlamp switch C205-5, circuit 8-LF14 (WH/BU), harness side and instrument cluster C220c-8, circuit 8-LF14 (WH/BU), harness side; and between headlamp switch C205-5, circuit 8-LF14 (WH/BU), harness side and ground.
      Fig 6: Measuring Resistance Between Headlamp Switch C205-5, Circuit 8-LF14 And Instrument Cluster C220C-8, Circuit 8-LF14; And Between Headlamp Switch C205-5, Circuit 8-LF14 And Ground
      G03998566Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the headlamp switch and the instrument cluster; and greater than 10,000 ohms between the headlamp switch and ground? 
    • Yes  : GO to  E17.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  17. E17 CHECK CIRCUIT 8-LF14 (WH/BU) FOR A SHORT TO POWER 
    • Key in ON position.
    • Measure the voltage between headlamp switch C205-5, circuit 8-LF14 (WH/BU), harness side and ground.
      Fig 7: Measuring Voltage Between Headlamp Switch C205-5, Circuit 8-LF14 (WH/BU) And Ground
      G03998567Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes  : REPAIR the circuit. TEST the system for normal operation.
    • No  : GO to  E18.
  18. E18 CHECK CIRCUIT 10-LE21 (GY/OG) FOR AN OPEN OR SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between headlamp switch C205-9, circuit 10-LE21 (GY/OG), harness side and instrument cluster C220c-7, circuit 10-LE21 (GY/OG), harness side; and between headlamp switch C205-9, circuit 10-LE21 (GY/OG), harness side and ground.
      Fig 8: Measuring Resistance Between Headlamp Switch C205-9, Circuit 10-LE21 And Instrument Cluster C220C-7, Circuit 10-LE21; And Between Headlamp Switch C205-9, Circuit 10-LE21 And Ground
      G03998568Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the headlamp switch and the instrument cluster; and greater than 10,000 ohms between the headlamp switch and ground? 
    • Yes  : GO to  E19.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  19. E19 CHECK CIRCUIT 10-LE21 (GY/OG) FOR A SHORT TO POWER 
    • Key in ON position.
    • Measure the voltage between headlamp switch C205-9, circuit 10-LE21 (GY/OG), harness side and ground.
      Fig 9: Measuring Voltage Between Headlamp Switch C205-9, Circuit 10-LE21 (GY/OG) And Ground
      G03998569Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes  : REPAIR the circuit. TEST the system for normal operation.
    • No  : GO to  E20.
  20. E20 CHECK CIRCUIT 10-LE47 (GY/OG) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between headlamp switch C205-4, circuit 10-LE47 (GY/OG), harness side and ground.
      Fig 10: Measuring Resistance Between Headlamp Switch C205-4, Circuit 10-LE47 (GY/OG) And Ground
      G03998570Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : REPAIR the circuit. TEST the system for normal operation.
    • No  : GO to  E21.
  21. E21 CHECK CIRCUIT 9-LE29 (BN/GN) FOR AN OPEN 
    • Measure the resistance between headlamp switch C205-7, circuit 9-LE29 (BN/GN), harness side and instrument cluster C220C-1, circuit 9-LE29 (BN/GN), harness side.
      Fig 11: Measuring Resistance Between Headlamp Switch C205-7, Circuit 9-LE29 And Instrument Cluster C220C-1, Circuit 9-LE29
      G03998571Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to  E22.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  22. E22 CHECK CIRCUIT 9-LE29 (BN/GN) FOR A SHORT TO POWER 
    • Key in ON position.
    • Measure the voltage between headlamp switch C205-7, circuit 9-LE29 (BN/GN), harness side ground.
      Fig 12: Measuring Voltage Between Headlamp Switch C205-7, Circuit 9-LE29 (BN/GN), Harness Side Ground
      G03998572Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes  : REPAIR the circuit. TEST the system for normal operation.
    • No  : GO to  E23.
  23. E23 CHECK INSTRUMENT CLUSTER OPERATION 
    • Key in OFF position.
    • Disconnect all instrument cluster connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all instrument cluster 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 instrument cluster. REFER to INSTRUMENT CLUSTER . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
  24. E24 CHECK FEM OPERATION 
    • Key in OFF position.
    • Disconnect all FEM connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all FEM 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 FEM. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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