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Pinpoint Test A: Both Head Lamps Are Inoperative

  1. A1 CHECK THE HIGH BEAMS 
    • Key in ON position.
    • Place the headlamp switch in the headlamps ON position.
    • Place the multifunction switch in the high beam position.
    • Do the high beams illuminate? 
  2. A2 CHECK THE RELAY GROUND CIRCUIT FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Low Beam Relay C1049.
    • Measure the resistance between the low beam relay C1049-2, circuit 91-DA3 (BK/OG), harness side and ground.
      Fig 1: Measuring Resistance Between Low Beam Relay C1049-2, Circuit 91-DA3 (BK/OG), Harness Side And Ground
      G03890478Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to  A3.
    • No  : REPAIR the relay ground circuit. TEST the system for normal operation.
  3. A3 BYPASS THE HEADLAMP SWITCH 
    • Connect: Low Beam Relay C1049.
    • Disconnect: Headlamp Switch C205.
    • Connect a fused (7.5A) jumper wire between the headlamp switch C205-6, circuit 15S-LE14 (GN/RD), harness side and the headlamp switch C205-8, circuit 15-LE29 (GN/BK), harness side.
      Fig 2: Bypassing Headlamp Switch
      G03952380Courtesy of FORD MOTOR CO.
    • Key in ON position.
    • Do the headlamps illuminate? 
    • Yes  : INSTALL a new headlamp switch. REFER to HEADLAMP SWITCH . TEST the system for normal operation.
    • No  : GO to  A4.
  4. A4 BYPASS THE MULTIFUNCTION SWITCH 
    • Key in OFF position.
    • Disconnect: Multifunction Switch C202.
    • Connect a fused (7.5A) jumper wire between the multifunction switch C202-8, circuit 15S-LE14 (GN/RD), harness side and the multifunction switch C202-9, circuit 15S-LE19 (GN/BU), harness side.
      Fig 3: Bypassing Multifunction Switch
      G03952381Courtesy of FORD MOTOR CO.
    • Key in ON position.
    • Do the headlamps illuminate? 
    • Yes  : INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES . TEST the system for normal operation.
    • No  : GO to  A5.
  5. A5 CHECK CIRCUIT 15S-LE14 (GN/RD) FOR AN OPEN 
    • Key in OFF position.
    • Remove the fused jumper wires.
    • Measure the resistance between the headlamp switch C205-6, circuit 15S-LE14 (GN/RD), harness side and the multifunction switch C202-8, circuit 15S-LE14 (GN/RD), harness side.
      Fig 4: Checking Circuit 15S-LE14 (GN/RD) For An Open
      G03952382Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to A6
    • No  : REPAIR the circuit. TEST the system for normal operation.
  6. A6 CHECK FOR VOLTAGE TO THE HEADLAMP SWITCH 
    • Key in ON position.
    • Measure the voltage between the headlamp switch C205-8, circuit 15-LE29 (GN/BK), harness side and ground.
      Fig 5: Measuring Voltage Between Headlamp Switch C205-8, Circuit 15-LE29 (GN/BK), Harness Side And Ground
      G03952383Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : REPAIR or INSTALL a new BJB. TEST the system for normal operation.
    • No  : GO to  A7.
  7. A7 CHECK THE FLASH-TO-PASS OPERATION 
    • Key in OFF position.
    • Connect: Multifunction Switch C202.
    • Key in ON position.
    • While observing the headlamps, engage the flash-to-pass feature of the multifunction switch.
    • Do the headlamps illuminate? 
    • Yes  : REPAIR circuit 15-LE29 (GN/BK). TEST the system for normal operation.
    • No  : REPAIR or INSTALL a new CJB. TEST the system for normal operation.
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