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Pinpoint Test A: Both Headlamps Are Inoperative

  1. A1 CHECK THE VOLTAGE TO THE HEADLAMP SWITCH 
    • Disconnect: Headlamp Switch C205.
    • Measure the voltage between headlamp switch C205 Pin B1, Circuit 196 (DB/OG), harness side and ground.
      Fig 1: Checking Voltage To Headlamp Switch
      G03242650Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes:  GO to A2.
    2. No:  REPAIR the circuit. TEST the system for normal operation.
  2. A2 CHECK CIRCUIT 15 (RD/YE) FOR OPEN 
    • Disconnect: Multifunction Switch C202a.
    • Measure the resistance between headlamp switch C205 Pin H, Circuit 15 (RD/YE), harness side and multifunction switch C202a Pin 15, Circuit 15 (RD/YE), harness side.
      Fig 2: Checking Circuit 15 (RD/YE) For Open
      G03242651Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes:  RECONNECT headlamp switch C205. GO to A3.
    2. No:  REPAIR the circuit. TEST the system for normal operation.
  3. A3 CHECK THE VOLTAGE TO THE MULTIFUNCTION SWITCH 
    • Place the headlamp switch in the ON position.
    • Measure the voltage between multifunction switch C202a Pin 15, Circuit 15 (RD/YE), harness side and ground.
      Fig 3: Checking Voltage To Multifunction Switch
      G03242652Courtesy 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.
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