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Pinpoint Test E: The Headlamps Are On Continuously: Testing

WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
  1. E1 CHECK THE HEADLAMP SWITCH INPUT 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: SJB Headlamp Switch PIDs.
    • Monitor the SJB headlamp switch PIDs while moving the headlamp switch through all positions.
    • Do the PIDs agree with the headlamp switch positions? 
    • Yes  : If the low beams are always on, GO to  E6.

      If the high beams are always on, GO to  E7.

    • No  : GO to E2.
  2. E2 CHECK THE HEADLAMP SWITCH 
    • Key in OFF position.
    • Disconnect: Headlamp Switch C205.
    • Carry out the headlamp switch component test. Refer to COMPONENT TESTING .
    • Is the headlamp switch OK? 
    • Yes  : GO to E3.
    • No  : INSTALL a new headlamp switch. CLEAR the DTCs. REPEAT the self-test.
  3. E3 CHECK CIRCUIT 1205 (BK) FOR AN OPEN 
    • Measure the resistance between the headlamp switch C205-7, circuit 1205 (BK), harness side and ground.
      Fig 1: Checking Circuit 1205 (BK) For Open
      G03992755Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to E4.
    • No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  4. E4 CHECK THE HEADLAMP SWITCH INPUT CIRCUITS FOR A SHORT TO GROUND 
    • Disconnect: SJB 2280d.
    • Measure the resistance between the headlamp switch, harness side and ground as follows:
      SJB CONNECTOR-PIN REFERENCE

      Connector-Pin Circuit
      C205-4 (if equipped with autolamps) 1399 (DB/WH)
      C205-9 1400 (TN/WH)
      C205-5 1401 (BK/LG)
      C205-10 1402 (RD/WH)
    • Are the resistances greater than 10,000 ohms? 
    • Yes  : GO to E5.
    • No  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  5. E5 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:
      SJB CONNECTOR-PIN REFERENCE

      Headlamp Switch Connector-Pin SJB Connector-Pin Circuit
      C205-4 (if equipped with autolamps) C2280d-24 1399 (DB/WH)
      C205-9 C2280d-7 1400 (TN/WH)
      C205-5 C2280d-26 1401 (BK/LG)
      C205-10 C2280d-8 1402 (RD/WH)
    • Are the resistances less than 5 ohms? 
    • Yes  : GO to  E11.
    • No  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  6. E6 CHECK CIRCUIT 1336 (LG/WH) AND CIRCUIT 1338 (WH) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: SJB 2280a.
    • Key in ON position.
    • Does either headlamp continue to illuminate? 
    • Yes  : REPAIR circuit 1338 (WH) (LH headlamp) or circuit 1336 (LG/WH) (RH headlamp) as necessary. CLEAR the DTCs. REPEAT the self-test.
    • No  : GO to  E11.
  7. E7 CHECK THE INPUT FROM THE MULTIFUNCTION SWITCH 
    • Enter the following diagnostic mode on the diagnostic tool: SJB Multifunction Switch PIDs.
    • Monitor the SJB multifunction switch PIDs while placing the multifunction switch in the HIGH BEAM, LOW BEAM and FLASH-TO-PASS positions.
    • Do the PIDs agree with the multifunction switch positions? 
    • Yes  : GO to  E10.
    • No  : GO to E8.
  8. E8 CHECK CIRCUITS 196 (DB/OG) AND 1708 (LG/BK) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: SJB C2280d.
    • Disconnect: Multifunction Switch C202a.
    • Measure the resistance between the multifunction switch C202a-9, circuit 196 (DB/OG), harness side and ground; and between the multifunction switch C202a-8, circuit 1708 (LG/BK), harness side and ground.
      Fig 2: Checking Circuits 196 (DB/OG) And 1708 (LG/BK) For Short To Ground
      G03992756Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    • Yes  : GO to E9.
    • No  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  9. E9 CHECK THE MULTIFUNCTION SWITCH 
    • Connect: Multifunction Switch C202a.
      • NOTE: Make sure the multifunction switch is in the LOW BEAM position.
      Fig 3: Checking Multifunction Switch
      G03992757Courtesy of FORD MOTOR CO.
    • Measure the resistance between the SJB C2280d-13, circuit 196 (DB/OG), harness side and ground; and between the SJB C2280d-28, circuit 1708 (LG/BK), harness side and ground.
    • Are the resistances greater than 10,000 ohms? 
    • Yes  : GO to  E11.
    • No  : INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES . CLEAR the DTCs. REPEAT the self-test.
  10. E10 CHECK CIRCUIT 1337 (VT/YE) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: SJB 02280a.
    • Key in ON position.
    • Do the headlamps continue to illuminate? 
    • Yes  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
    • No  : GO to E11.
  11. E11 CHECK FOR CORRECT SJB OPERATION 
    • Disconnect all the SJB connectors.
    • Check for:
      • corrosion
      • 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? 
    • Yes  : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
    • 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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