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Pinpoint Test P: The Fog Lamps Are Inoperative

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. P1 USE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE SJB SELF-TEST 
    • Key in OFF position.
    • Using the recorded results from the SJB self-test:
    • Was DTC B2030 retrieved? 
    1. Yes  : GO to  P4.
    2. No  : GO to P2.
  2. P2 CHECK THE VOLTAGE TO THE FOG LAMP SWITCH 
    • Disconnect: Fog lamp switch C240.
    • Key in ON position.
    • Measure the voltage between the fog lamp switch C240 pin 3, circuit 477 (LB/BK), harness side and ground.
      Fig 1: Checking Voltage To Fog Lamp Switch
      G03277211Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to  P5.
    2. No  : GO to P3.
  3. P3 CHECK CIRCUIT 474 (OG/LG) FOR VOLTAGE 
    • Disconnect: Fog Lamp Relay C1007.
    • Measure the voltage between the fog lamp relay C1007 pin 1, circuit 474 (OG/LG), harness side and ground.
      Fig 2: Checking Circuit 474 (OG/LG) For Voltage
      G03277212Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to  P7.
    2. No  : GO to P4.
  4. P4 CHECK CIRCUIT 474 (OG/LG) FOR AN OPEN OR A SHORT TO GROUND 
    • Disconnect: SJB C2280d.
    • Measure the resistance between the between the fog lamp relay C1007 pin 1, circuit 474 (OG/LG), harness side and the SJB C2280d pin 17, circuit 474 (OG/LG), harness side; and between the fog lamp relay C1007 pin 1, circuit 474 (OG/LG), harness side and ground.
      Fig 3: Checking Circuit 474 (OG/LG) For An Open Or A Short To Ground
      G03277213Courtesy 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? 
    1. Yes  : GO to  P9.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  5. P5 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Measure the resistance between the between the fog lamp switch C240 pin 4, circuit 57 (BK), harness side and ground.
      Fig 4: Checking Circuit 57 (BK) For An Open
      G03277214Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to P6.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  6. P6 CHECK THE FOG LAMP SWITCH 
    • Place the fog lamp switch in the ON position.
    • Measure the resistance between the fog lamp switch C240 pin 3, component side and the fog lamp switch C240 pin 4, component side.
      Fig 5: Checking Fog Lamp Switch
      G03277215Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to  P8.
    2. No  : INSTALL a new fog lamp switch. REFER to LAMP SWITCH - FOG .

      TEST the system for normal operation.

  7. P7 CHECK CIRCUIT 477 (LB/BK) FOR AN OPEN 
    • Measure the resistance between the fog lamp relay C1007 pin 2, circuit 477 (LB/BK), harness side and the fog lamp switch C240 pin 3, circuit 477 (LB/BK), harness side.
      Fig 6: Checking Circuit 477 (LB/BK) For An Open
      G03277216Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : INSTALL a new fog lamp relay. TEST the system for normal operation.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  8. P8 CHECK CIRCUIT 54 (LG/YE) FOR VOLTAGE 
    • Connect a 10A fused jumper wire between the fog lamp relay pin 3, circuit 54 (LG/YE), harness side and the fog lamp relay pin 5, circuit 478 (TN/OG) harness side.
      Fig 7: Checking Circuit 54 (LG/YE) For Voltage
      G03277217Courtesy of FORD MOTOR CO.
    • Do the fog lamps illuminate? 
    1. Yes  : INSTALL a new fog lamp relay and test the system for normal operation.
    2. No  : REPAIR circuit 478 (TN/OG). TEST the system for normal operation.
  9. P9 CHECK FOR CORRECT SMART JUNCTION BOX (SJB) OPERATION 
    • Key in OFF position.
    • Disconnect all SJB connectors.
    • Check for:
      • Corrosion
      • Pushed-out pins
    • Connect all SJB connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. Yes  : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC CONTROL MODULES . TEST the system for normal operation.
    2. No  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
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