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Pinpoint Test C: One High Beam Headlamp Is Inoperative

WARNING: This page is about a different car, the 2008 Mercury Sable, 2008 Ford Taurus X, and 2008 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. C1 CHECK FOR VOLTAGE TO THE HEADLAMP 
    • Key in OFF position.
    • Disconnect: Inoperative Headlamp
    • Place the headlamp switch in the HEADLAMPS ON position.
    • Place the multifunction switch in the HIGH BEAM position.
    • For Sable or Taurus X, measure the voltage between the LH headlamp C1020-1, circuit CLF08 (YE/VT), harness side and ground; or between the RH headlamp C1040-1, circuit CLF08 (YE/VT), harness side and ground.
      • Fig 1: Measuring Voltage
      GF0046130Courtesy of FORD MOTOR CO.
    • For Taurus, measure the voltage between the LH headlamp C1284-7, circuit CLF08 (YE/VT), harness side and ground; or between the RH headlamp C1285-7, circuit CLF08 (YE/VT), harness side and ground.
      • Fig 2: Checking Circuit CLS08 (VT/GN) For Open
      GF0030468Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : For Taurus, REPAIR or INSTALL a new headlamp assembly. REFER to Headlamp Assembly . TEST the system for normal operation.

      For Sable or Taurus X, REPAIR circuit GD120 (BK/GN) (LH) or circuit GD123 (BK/GY) (RH) for an open. TEST the system for normal operation.

    2. NO  : REPAIR the circuit CLF08 (YE/VT) for an open. TEST the system for normal operation.
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