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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 799 (Exterior Lighting) >> Diagnosis And Testing >> Fog Lamps >> Pinpoint Tests >> Pinpoint Test S: The Fog Lamps Are Inoperative >> Pinpoint Test S: The Fog Lamps Are Inoperative

Pinpoint Test S: The Fog Lamps Are Inoperative

WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
  1. S1 CHECK THE HEADLAMP SWITCH PID 
    • Key in ON position.
    • Enter the following diagnostic mode on the scan tool: SJB Headlamp Switch PID.
    • Monitor the headlamp switch PID while engaging the fog lamp switch.
    • Does the PID agree with the headlamp switch position? 

    Yes  : GO to  S4.

    No  : GO to S2.

  2. S2 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 S3.

    No  : INSTALL a new headlamp switch. REFER to HEADLAMP SWITCH . CLEAR the DTCs. REPEAT the self-test.

  3. S3 CHECK CIRCUIT CLF21 (GY/VT) FOR AN OPEN 
    • Disconnect: SJB C2280d.
    • Measure the resistance between the headlamp switch C205-6, circuit CLF21 (GY/VT), harness side and the SJB C2280d-28, circuit CLF21 (GY/VT), harness side.
      Fig 1: Checking Circuit CLF21 (GY/VT) For Open
      G04682843Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : GO to  S10.

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

  4. S4 CHECK THE FOG LAMP RELAY 
    • Key in OFF position.
    • Disconnect: Fog Lamp Relay.
    • Carry out the fog lamp relay component test. Refer to COMPONENT TESTING .
    • Is the fog lamp relay OK? 

    Yes  : GO to S5.

    No  : INSTALL a new fog lamp relay. CLEAR the DTCs. REPEAT the self-test.

  5. S5 CHECK CIRCUIT CLF29 (BN) FOR VOLTAGE 
    • Key in ON position.
    • Place the headlamp switch in the HEADLAMPS ON position and engage the fog lamp switch.
    • Measure the voltage between the fog lamp relay pin 1, circuit CLF29 (BN), harness side and ground.
      Fig 2: Checking Circuit CLF29 (BN) For Voltage
      G04682844Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes  : PLACE the headlamp switch in the OFF position. GO to  S8.

    No  : PLACE the headlamp switch in the OFF position. GO to S6.

  6. S6 CHECK CIRCUIT CLF29 (BN) FOR AN OPEN AND SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: SJB C2280a.
    • Measure the resistance between the fog lamp relay pin 1, circuit CLF29 (BN), harness side and the SJB C2280-a, circuit CLF29 (BN), harness side; and between the fog lamp relay pin 1, circuit CLF29 (BN), harness side and ground.
      Fig 3: Checking Circuit CLF29 (BN) For Open And Short To Ground
      G04682845Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the fog lamp relay and the SJB, and greater than 10,000 ohms between the fog lamp relay and ground? 

    Yes  : GO to S7.

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

  7. S7 CHECK CIRCUIT CLF28 (BN/WH) FOR A SHORT TO GROUND 
    • Disconnect: SJB 2280d.
    • Disconnect: Headlamp Switch C205.
    • Measure the resistance between the headlamp switch C205-7, circuit CLF28 (BN/WH), harness side and ground.
      Fig 4: Identifying Circuit CLF28 (BN/WH) For Short To Ground
      G04682846Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 

    Yes  : GO to  S10.

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

  8. S8 CHECK CIRCUIT SBB24 (VT/RD) FOR AN OPEN 
    • Key in OFF position.
    • Measure the voltage between the fog lamp relay pin 3, circuit SBB24 (VT/RD), harness side and ground.
      Fig 5: Checking Circuit SBB24 (VT/RD) For Open
      G04682847Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes  : GO to S9.

    No  : VERIFY the BJB fuse 24 (15A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

  9. S9 CHECK CIRCUIT GD121 (BK/YE) FOR AN OPEN 
    • Measure the resistance between the fog lamp relay pin 2, circuit GD121 (BK/YE), harness side and ground.
      Fig 6: Checking Circuit GD121 (BK/YE) For Open
      G04682848Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : REPAIR circuit CLF12 (BN/YE). CLEAR the DTCs. REPEAT the self-test.

    No  : REPAIR circuit GD121 (BK/YE). CLEAR the DTCs. REPEAT the self-test.

  10. S10 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 CONTROL 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 any DTCs. REPEAT the self-test.

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