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Pinpoint Test A: All DIMMABLE Illumination Is Inoperative

  1. A1 CHECK THE PARKING LAMP OPERATION 
    • Ignition OFF.
    • Turn the parking lamps on.
    • Do the parking lamps operate correctly? 
  2. A2 CHECK THE HEADLAMP SWITCH GROUND CIRCUIT FOR AN OPEN 
    • Turn the parking lamps off.
    • Disconnect: Headlamp Switch C205.
    • Measure the voltage between the headlamp switch C205-11, circuit 29-LE29 (OG/BK), harness side and the headlamp switch C205-10, circuit 31-LE29 (BK), harness side.
      Fig 1: Measuring Voltage Between Headlamp Switch C205-11, Circuit 29-LE29 (OG/BK) And Headlamp Switch C205-10, Circuit 31-LE29 (BK)
      G06294045Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
      • Yes  : GO to A3.
      • No  : REPAIR circuit 31-LE29 (BK) for an open. TEST the system for normal operation.
  3. A3 CHECK THE HEADLAMP SWITCH OUTPUT CIRCUIT FOR AN OPEN OR SHORT TO GROUND 
      NOTE: If the fuse in the jumper wire fails, repair the dimmable lighting output circuit for a short to ground.
      Fig 2: Connecting Fused Jumper Wire Between Headlamp Switch C205-9 And Headlamp Switch C205-11
      G06294046Courtesy of FORD MOTOR CO.
    • Connect a fused jumper wire between the headlamp switch C205-9, circuit 29S-DA2 (OG/BU), harness side and the headlamp switch C205-11, circuit 29-LE29 (OG/BK), harness side.
    • Do the backlighting components illuminate? 
      • Yes  : REMOVE the jumper wire. INSTALL a new headlamp switch. REFER to EXTERIOR LIGHTING . TEST the system for normal operation.
      • No  : REMOVE the jumper wire. REPAIR circuit 29S-DA2 (OG/BU) for an open. TEST the system for normal operation.
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