Pinpoint Test I: Single Power Window Is Inoperative - Driver Front Window

WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

I1 CHECK ALL POWER WINDOW OPERATION
- Check the operation of all windows.
- Do all other power windows operate correctly?
Yes

GO to I2.

No

REPAIR the power window supply circuit.
I2 CHECK THE DRIVER POWER WINDOW DOWN OPERATION
- Key in OFF position.
- Disconnect: Driver Window Control Switch C504a.
- Connect a jumper wire between driver window control switch C504a-8, circuit 992 (WH/BK), and ground; and between driver window control switch C504a-7, circuit 991 (TN/LB), and the positive battery terminal.
  
  Fig 1: Connecting A Jumper Wire Between Driver Window Control Switch Circuit 992 And Ground; And Between Driver Window Control Switch C504A-7, Circuit 991 (TN/LB), And The Positive Battery Terminal
  Courtesy of FORD MOTOR CO.
- Does the driver power window go down?
Yes

GO to I3.

No

REMOVE the jumper wires. GO to I5.
I3 CHECK THE DRIVER POWER WINDOW UP OPERATION
- Connect a jumper wire between driver window control switch C504a-7, circuit 991 (TN/LB) and ground; and between driver window control switch C504a-8, circuit 992 (WH/BK) and the positive battery terminal.
  
  Fig 2: Connecting A Jumper Wire Between Driver Window Control Switch Circuit 991 And Ground; And Between Driver Window Control Switch C504A-8, Circuit 992 (WH/BK) And The Positive Battery Terminal
  Courtesy of FORD MOTOR CO.
- Does the driver power window go up?
Yes

INSTALL a new window control switch. REFER to WINDOW CONTROL SWITCH . TEST the system for normal operation.

No

REMOVE the jumper wires. GO to I4.
I4 CHECK CIRCUIT 991 (TN/LB) FOR OPEN
- Disconnect: Driver Power Window Motor C524.
- Measure the resistance between driver power window motor C524-2, circuit 991 (TN/LB), and driver window control switch C504a-7, circuit 991 (TN/LB) harness side.
  
  Fig 3: Measuring Resistance Driver Power Window Motor Circuit 991 And Driver Window Control Switch Circuit 991
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes

GO to I4.

No

REPAIR the circuit. TEST the system for normal operation.
I5 CHECK CIRCUIT 992 (WH/BK) FOR OPEN
- Measure the resistance between driver power window motor C524-1, circuit 992 (WH/BK), and driver window control switch C504a-8, circuit 992 (WH/BK) harness side.
  
  Fig 4: Measuring Resistance Between Driver Power Window Motor C524-1, Circuit 992 And Driver Window Control Switch C504A-8, Circuit 992 (WH/BK) Harness Side
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes

INSTALL a new driver power window motor. REFER to DOOR WINDOW GLASS - FRONT . TEST the system for normal operation.

No

REPAIR the circuit. TEST the system for normal operation.