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Pinpoint Test H: The AUTOLAMPS Are On Continuously

WARNING: This page is about a different car, the 2006 Mercury Montego, 2006 Ford Freestyle, and 2006 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
  1. H1 USE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCs) FROM THE SJB SELF-TEST 
    • Using the recorded results from the SJB self-test:
    • Were any DTCs recorded? 

    Yes:  For DTC B2498, GO to  H2.

    For DTC B1472 or B1692, GO to  H4.

    For DTC B1792, GO to  H7.

    No:  GO to  H2.

  2. H2 CHECK THE SJB HEADLAMP SWITCH PIDs 
    • Key in ON position.
    • Enter the following diagnostic mode on the scan tool: SJB Headlamp Switch PIDs.
    • Monitor the SJB headlamp switch PIDs while moving the headlamp switch through all positions.
    • Do the headlamp switch positions agree with the PIDs? 

    Yes:  GO to  H7.

    No:  GO to  H3.

  3. H3 CHECK CIRCUIT 1205 (BK) FOR AN OPEN (HEADLAMP SWITCH) 
    • Key in OFF position.
    • Disconnect: Headlamp Switch C205.
    • Measure the resistance between the headlamp switch C205-7, circuit 1205 (BK), harness side and ground.
      Fig 1: Checking Circuit 1205 (BK) (Headlamp Switch)
      G04658295Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes:  GO to  H4.

    No:  REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

  4. H4 CHECK THE HEADLAMP SWITCH 
    • Key in OFF position.
    • Disconnect: Headlamp Switch C205.
    • Carry out the headlamp switch component test. Refer toCOMPONENT TESTING article for component testing.
    • Is the headlamp switch OK? 

    Yes:  GO to  H5.

    No:  INSTALL a new headlamp switch. CLEAR the DTCs. REPEAT the self-test.

  5. H5 CHECK THE HEADLAMP SWITCH INPUT CIRCUITS FOR A SHORT TO GROUND 
    • Disconnect: SJB C2280d.
    • Measure the resistance between the headlamp switch, harness side and ground as follows:
      RESISTANCE TEST REFERENCE

      Connector-Pin Circuit
      C205-4 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  H6.

    No:  REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

  6. H6 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:
      RESISTANCE TEST REFERENCE

      Headlamp Switch Connector-Pin SJB Connector-Pin Circuit
      C205-4 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  H11.

    No:  REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

  7. H7 CHECK CIRCUIT 1205 (BK) FOR AN OPEN (LIGHT SENSOR) 
    • Key in OFF position.
    • Disconnect: Light Sensor C286.
    • Measure the resistance between the light sensor C286-4, circuit 1205 (BK), harness side and ground.
      Fig 2: Measuring Resistance Between Light Sensor C286-4, Circuit 1205 (BK), Harness Side & Ground
      G04658296Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes:  GO to  H8.

    No:  REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

  8. H8 CHECK CIRCUIT 1416 (YE/WH) FOR A SHORT TO VOLTAGE 
    • Disconnect: SJB C2280d.
    • Key in ON position.
    • Measure the voltage between the light sensor C286-2, circuit 1416 (YE/WH), harness side and ground.
      Fig 3: Measuring Voltage Between Light Sensor C286-2, Circuit 1416 (YE/WH), Harness Side & Ground
      G04658297Courtesy of FORD MOTOR CO.
    • Is any voltage present? 

    Yes:  REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

    No:  GO to  H9.

  9. H9 CHECK CIRCUIT 1416 (YE/WH) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the SJB C2280d-14, circuit 1416 (YE/WH), harness side and the light sensor C286-2, circuit 1416 (YE/WH), harness side.
      Fig 4: Checking Circuit 1416 (YE/WH)
      G04658298Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes:  GO to  H10.

    No:  REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

  10. H10 CHECK FOR VOLTAGE TO THE LIGHT SENSOR 
    • Connect: SJB C2280d.
    • Key in ON position.
    • Place the headlamp switch in the AUTOLAMPS ON position.
    • Measure the voltage between the light sensor C286-2, circuit 1416 (YE/WH) and ground.
      Fig 5: Measuring Voltage Between Light Sensor C286-2, Circuit 1416 (YE/WH) & Ground
      G04658299Courtesy of FORD MOTOR CO.
    • Is the voltage approximately 5 volts? 

    Yes:  INSTALL a new light sensor. CLEAR the DTCs. REPEAT the self-test.

    No:  GO to  H11.

  11. H11 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 REMOVAL AND INSTALLATION . 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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