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Pinpoint Test A: Both Headlamps 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. A1 CHECK THE FLASH-TO-PASS FEATURE 
    • Key in ON position.
    • Check the operation of the flash-to-pass feature.
    • Does the flash-to-pass feature operate correctly? 
    1. Yes  : GO to A2.
    2. No  : GO to  A6.
  2. A2 CHECK THE VOLTAGE TO THE HEADLAMP SWITCH 
    • Key in OFF position.
    • Disconnect: Headlamp Switch C205.
    • Measure the voltage between the headlamp switch C205 pin 6, circuit 1033 (RD/YE), harness side and ground.
      Fig 1: Checking Voltage To Headlamp Switch
      G03277177Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to  A4.
    2. No  : GO to A3
  3. A3 CHECK THE VOLTAGE FROM THE SMART JUNCTION BOX (SJB) 
    • Disconnect: SJB C2280b.
    • Measure the voltage between the SJB C2280b pin 4, circuit 1033 (RD/YE), component side and ground.
      Fig 2: Checking Voltage From Smart Junction Box (SJB)
      G03277178Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : REPAIR the circuit and TEST the system for normal operation.
    2. No  : GO to  A7.
  4. A4 CHECK CIRCUIT 164 (VT/LB) FOR AN OPEN 
    • Disconnect: Multifunction Switch C202b.
    • Measure the resistance between the headlamp switch C205 pin 2, circuit 164 (VT/LB), harness side and the multifunction switch C202b pin 8, circuit 164 (VT/LB), harness side.
      Fig 3: Checking Circuit 164 (VT/LB) For An Open
      G03277179Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : RECONNECT the headlamp switch. GO to A5.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  5. A5 CHECK THE VOLTAGE TO THE MULTIFUNCTION SWITCH 
    • Place the headlamp switch in the headlamps ON position.
    • Measure the voltage between the multifunction switch C202b pin 8, circuit 164 (VT/LB), harness side and ground.
      Fig 4: Checking Voltage To Multifunction Switch
      G03277180Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES . TEST the system for normal operation.
    2. No  : INSTALL a new headlamp switch. REFER to LAMP SWITCH - HEADLAMP . TEST the system for normal operation.
  6. A6 CHECK THE MULTIFUNCTION SWITCH 
    • Carry out the multifunction switch component test for the headlamps.

      Refer to the appropriate SYSTEM WIRING DIAGRAMS for schematic and connector information.

    • Is the multifunction switch OK? 
    1. Yes  : TURN the headlamp switch in the off. GO to A7.
    2. No  : INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES . TEST the system for normal operation.
  7. A7 CHECK FOR CORRECT 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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