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Pinpoint Test E: The Autolamps Are On Continuously

WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.
  1. E1 USE THE RECORDED DTCS FROM THE SJB SELF-TEST 
    • Key in OFF position.
    • Using the recorded results from the SJB self-test:
    • Were any DTCs recorded? 

    Yes 

    If DTCB1470, GO to E2.

    If DTCB1790, GO to  E8.

    No 

    GO to  E8.

  2. E2 CHECK THE HEADLAMP SWITCH OUTPUT 
    • Connect the diagnostic tool.
    • Key in ON position.
    • Monitor the SJB headlamp switch status PID while rotating the knob through all of the headlamp switch positions.
    • Does the PID match with the headlamp switch positions? 

    Yes 

    GO to  E13

    No 

    GO to E3.

  3. E3 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 E4.

    No 

    INSTALL a new headlamp switch. Refer to HEADLAMP SWITCH . CLEAR any DTCs. TEST the system for normal operation.

  4. E4 CHECK CIRCUIT 1205 (BK) FOR AN OPEN 
    • Measure the resistance between headlamp switch C205-7, circuit 1205 (BK), harness side and ground.
      Fig 1: Measuring Resistance Between Headlamp Switch C205-7, Circuit 1205 (BK), Harness Side And Ground
      G03245916Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes 

    GO to E5.

    No 

    REPAIR the circuit. CLEAR any DTCs. TEST the system for normal operation.

  5. E5 CHECK THE HEADLAMP SWITCH SIGNAL CIRCUITS FOR A SHORT TO POWER 
    • Disconnect: SJB C2280b.
    • Key in ON position.
    • Measure the voltage between the headlamp switch connector, harness side and ground as follows:
      CIRCUIT DESCRIPTION

      Headlamp Switch Connector-Pin Circuit
      C205-4 1399 (DB/WH)
      C205-9 1400 (TN/WH)
      C205-5 1401 (BK/LG)
      C205-10 1402 (RD/WH)
      Fig 2: Measuring Voltage Between Headlamp Switch Connector, Harness Side And Ground
      G03245917Courtesy of FORD MOTOR CO.
    • Is any voltage present? 

    Yes 

    REPAIR the circuit in question. CLEAR any DTCs. TEST the system for normal operation.

    No 

    GO to E6.

  6. E6 CHECK THE HEADLAMP SWITCH SIGNAL CIRCUITS FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the SJB connector, harness side and headlamp switch connector, harness side as follows:
      CIRCUIT DESCRIPTION

      SJB Connector-Pin Headlamp Switch Connector-Pin Circuit
      C2280b-41 C205-4 1399 (DB/WH)
      C2280b-27 C205-9 1400 (TN/WH)
      C2280b-31 C205-5 1401 (BK/LG)
      C2280b-46 C205-10 1402 (RD/WH)
      Fig 3: Measuring Resistance Between SJB Connector, Harness Side And Headlamp Switch Connector, Harness Side
      G03245918Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 

    Yes 

    GO to E7.

    No 

    REPAIR the circuit in question. CLEAR any DTCs. TEST the system for normal operation.

  7. E7 CHECK THE HEADLAMP SWITCH SIGNAL CIRCUITS FOR SHORT TO GROUND 
    • Measure the resistance between the headlamp switch connector, harness side and ground as follows:
      CIRCUIT DESCRIPTION

      Headlamp Switch Connector-Pin Circuit
      C205-4 1399 (DB/WH)
      C205-9 1400 (TN/WH)
      C205-5 1401 (BK/LG)
      C205-10 1402 (RD/WH)
      Fig 4: Measuring Resistance Between Headlamp Switch Connector, Harness Side And Ground
      G03245919Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 

    Yes 

    GO to  E13

    No 

    REPAIR the circuit in question. CLEAR any DTCs. TEST the system for normal operation.

  8. E8 CHECK THE OPERATION OF THE LIGHT SENSOR 
    • Monitor the SJB light sensor status PID while covering and then illuminating the light sensor.
    • Does the PID percentage change with the sensor covered and then illuminated? 

    Yes 

    GO to  E13.

    No 

    GO to E9.

  9. E9 CHECK THE LIGHT SENSOR 
    • Key in OFF position.
    • Disconnect: Light Sensor C286.
    • Key in ON position.
    • Monitor the SJB light sensor status PID while connecting and then disconnecting a fused (5A) jumper wire between light sensor C286-2, circuit 1416 (YE/WH), harness side and light sensor C286-5, circuit 1203 (BK/LB), harness side.
      Fig 5: Checking Light Sensor
      G03245920Courtesy of FORD MOTOR CO.
    • Does the PID percentage change with the jumper wire connected and then disconnected? 

    Yes 

    INSTALL a new light sensor. Refer to LIGHT SENSOR .

    CLEAR any DTCs. TEST the system for normal operation.

    No 

    GO to E10.

  10. E10 CHECK THE CIRCUIT 1416 (YE/WH) FOR SHORT TO POWER 
    • Key in OFF position.
    • Disconnect: SJB C2280b.
    • Key in ON position.
    • Measure the voltage between light sensor C286-2, circuit 1416 (YE/WH), harness side ground.
      Fig 6: Measuring Voltage Between Light Sensor C286-2, Circuit 1416 (YE/WH), Harness Side Ground
      G03245921Courtesy of FORD MOTOR CO.
    • Is any voltage present? 

    Yes 

    REPAIR the circuit. CLEAR any DTCs. TEST the system for normal operation.

    No 

    GO to E11.

  11. E11 CHECK CIRCUIT 1416 (YE/WH) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between light sensor C286-2, circuit 1416 (YE/WH), harness side and SJB C2280b-15, circuit 1416 (YE/WH), harness side.
      Fig 7: Measuring Resistance Between Light Sensor C286-2, Circuit 1416 (YE/WH), Harness Side And SJB C2280B-15, Circuit 1416 (YE/WH), Harness Side
      G03245922Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes 

    GO to E12.

    No 

    REPAIR the circuit. CLEAR any DTCs. TEST the system for normal operation.

  12. E12 CHECK CIRCUIT 1203 (BK/LB) FOR AN OPEN 
    • Measure the resistance between light sensor C286-5, circuit 1203 (BK/LB), harness side and ground.
      Fig 8: Measuring Resistance Between Light Sensor C286-5, Circuit 1203 (BK/LB), Harness Side And Ground
      G03245923Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes 

    GO to E13.

    No 

    REPAIR the circuit. CLEAR any DTCs. TEST the system for normal operation.

  13. E13 CHECK FOR SJB OPERATION 
    • Key in OFF position.
    • 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 SMART JUNCTION BOX (SJB) .

    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 any DTCs. REPEAT the self-test.

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