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Pinpoint Test C: A Single Power Window Is Inoperative, LH Front - Zephyr

WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
  1. C1 CHECK THE POWER TO THE WINDOW MOTOR 
    • Key in OFF position.
    • Disconnect: LH Front Window Motor C540.
    • Measure the voltage between LH front window motor C540-4, circuit SBB34 (YE/RD), harness side and ground.
      Fig 1: Checking Power To Window Motor
      G04683552Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes  : GO to C2.

    No  : VERIFY BJB fuse 34 (30A) is OK. If OK, REPAIR the circuit. DE-INITIALIZE, then INITIALIZE the LH front window motor. REFER to WINDOW MOTOR INITIALIZATION . TEST the system for normal operation.

  2. C2 CHECK THE LH FRONT WINDOW MOTOR GROUND 
    • Key in OFF position.
    • Measure the resistance between LH front window motor C540-3, circuit GD126 (BK/WH), harness side and ground.
      Fig 2: Checking LH Front Window Motor Ground
      G04683553Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : GO to C3.

    No  : REPAIR the circuit. DE-INITIALIZE, then INITIALIZE the LH front window motor. REFER to WINDOW MOTOR INITIALIZATION . TEST the system for normal operation.

  3. C3 CHECK THE LH FRONT WINDOW CONTROL SWITCH-TO-LH FRONT WINDOW MOTOR FEEDS 
    • Disconnect: LH Front Window Control Switch C535A.
    • Measure the resistance between LH front window motor C540-1, circuit CPW10 (YE/VT), harness side and LH front window control switch C535A-7, circuit CPW10 (YE/VT), harness side.
      Fig 3: Checking LH Front Window Control Switch-To-LH Front Window Motor Feeds (1 Of 3)
      G04683554Courtesy of FORD MOTOR CO.
    • Measure the resistance between LH front window motor C540-5, circuit CPW29 (VT/GY), harness side and LH front window control switch C535A-8, circuit CPW29 (VT/GY), harness side.
      Fig 4: Checking LH Front Window Control Switch-To-LH Front Window Motor Feeds (2 Of 3)
      G04683555Courtesy of FORD MOTOR CO.
    • Measure the resistance between LH front window motor C540-6, circuit CPW11 (BU/GY), harness side and LH front window control switch C535A-4, circuit CPW11 (BU/GY), harness side.
      Fig 5: Checking LH Front Window Control Switch-To-LH Front Window Motor Feeds (3 Of 3)
      G04683556Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 

    Yes  : GO to C4.

    No  : REPAIR the circuit. DE-INITIALIZE, then INITIALIZE the LH front window motor. REFER to WINDOW MOTOR INITIALIZATION . TEST the system for normal operation.

  4. C4 CHECK THE LH FRONT WINDOW CONTROL SWITCH 
    • Carry out the LH front window control switch component test. Refer to COMPONENT TESTING .
    • Did the window control switch pass the component test? 

    Yes  : INSTALL a new LH front window motor. REFER to GLASS, FRAMES AND MECHANISMS - EXPLODED VIEW, FRONT DOOR  and WINDOW REGULATOR AND MOTOR - FRONT DOOR . INITIALIZE the LH front window motor. REFER to WINDOW MOTOR INITIALIZATION . TEST the system for normal operation.

    No  : INSTALL a new LH front window control switch. REFER to WINDOW CONTROL SWITCH . INITIALIZE the LH front window motor. REFER to WINDOW MOTOR INITIALIZATION . TEST the system for normal operation.

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