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Pinpoint Test A: Both Headlamps Are Inoperative

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. A1 CHECK FOR VOLTAGE TO THE HEADLAMP SWITCH 
    • Key in OFF position.
    • Disconnect: Headlamp Switch C205a.
    • Measure the voltage between headlamp switch C205a-8, circuit 196 (DB/OG), harness side and ground.
      Fig 1: Checking For Voltage To Headlamp Switch
      G03910935Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to  A3.
    • No  : GO to A2.
  2. A2 CHECK CIRCUIT 196 (DB/OG) FOR AN OPEN 
    • Disconnect: Central Junction Box (CJB) C270b.
    • Measure the resistance between headlamp switch C205a-8, circuit 196 (DB/OG), harness side and CJB C270b-12, circuit 196 (DB/OG), harness side.
      Fig 2: Checking Circuit 196 (DB/OG) For Open
      G03910936Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new CJB. TEST the system for normal operation.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  3. A3 CHECK CIRCUIT 15 (RD/YE) FOR AN OPEN 
    • Disconnect: Multifunction Switch C202a.
    • Measure the resistance between headlamp switch C205a-9, circuit 15 (RD/YE), harness side and multifunction switch C202a-8, circuit 15 (RD/YE), harness side.
      Fig 3: Checking Circuit 15 (RD/YE) For Open
      G03910937Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : RECONNECT the headlamp switch. GO to A4.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  4. A4 CHECK FOR VOLTAGE TO THE MULTIFUNCTION SWITCH 
    • Place the headlamp switch in the ON position.
    • Measure the voltage between multifunction switch C202a-8 circuit 15 (RD/YE), harness side and ground.
      Fig 4: Checking For Voltage To Multifunction Switch
      G03910938Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : TURN the headlamp switch off. GO to A5.
    • No  : INSTALL a new headlamp switch. REFER to LAMP SWITCH - HEADLAMP . TEST the system for normal operation.
  5. A5 CHECK FOR VOLTAGE FROM THE MULTIFUNCTION SWITCH 
    • Connect: Multifunction Switch C202a.
    • Disconnect: Central Junction Box (CJB) C270g.
    • Place the headlamp switch in the ON position.
    • Place the multifunction switch in the low beam position.
    • Measure the voltage between CJB C270g-4, circuit 13 (RD/BK), harness side and ground.
      Fig 5: Checking For Voltage From Multifunction Switch
      G03910939Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : REPAIR circuit 57 (BK). TEST the system for normal operation.
    • No  : INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES . TEST the system for normal operation.
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