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Pinpoint Test Y: The Alternating Flashing Headlamps Are Inoperative

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
  1. Y1 CHECK CIRCUITS 1337 (VT/YE) (LH HEADLAMP) AND 1335 (YE/WH) (RH HEADLAMP) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Wig-Wag Module C1365
    • Place the headlamp switch in the HEADLAMPS ON position.
    • Place the multifunction switch in the HIGH BEAM position.
      • Fig 1: Checking Circuits For Open
      GF0014584Courtesy of FORD MOTOR CO.
    • Measure the voltage between the wig-wag module C1365-D (LH headlamp), circuit 1337 (VT/YE), harness side and ground; and between the wig-wag module C1365-B (RH headlamp), circuit 1335 (YE/WH), harness side and ground.
    • Are the voltages greater than 10 volts? 
    1. YES  : Go to  Y2.
    2. NO  : REPAIR the circuit in question. TEST the system for normal operation.
  2. Y2 CHECK CIRCUIT 7 (LG/YE) FOR AN OPEN 
    • Place the headlamp switch in the OFF position.
    • Key in ON position.
    • Activate the switch for the wig-wag module.
      • Fig 2: Checking Circuit For Open
      GF0014585Courtesy of FORD MOTOR CO.
    • Measure the voltage between the wig-wag module C1365-A, circuit 7 (LG/YE), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  Y3.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  3. Y3 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Key in OFF position.
      • Fig 3: Checking Circuit For Open
      GF0014586Courtesy of FORD MOTOR CO.
    • Measure the resistance between the wig-wag module C1365-C, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new wig-wag module. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
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