Pinpoint Test B: All Power Windows Are Inoperative

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

Test Step

B1 CHECK CIRCUIT 400 (LB/BK) FOR VOLTAGE
- Disconnect: LF Window Control Switch C504a.
- Key in ON position.
- Measure the voltage between LF window control switch C504a pin 6, circuit 400 (LB/BK) harness side and ground.
  
  Fig 1: Checking Circuit 400 (LB/BK) For Voltage
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Result / Action to Take
- Yes : GO to B4.
- No : GO to B2.
B2 CHECK CIRCUIT 400 (LB/BK) FOR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: Accessory Delay Relay.
- Measure the resistance between LF window control switch C504a pin 6, circuit 400 (LB/BK) harness side and ground.
  
  Fig 2: Checking Circuit 400 (LB/BK) For Short To Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
- Yes : GO to B3.
- No : REPAIR the circuit. TEST the system for normal operation.
B3 CHECK CIRCUIT 400 (LB/BK) FOR AN OPEN
- Measure the resistance between LF window control switch C504a pin 6, circuit 400 (LB/BK) harness side and accessory delay relay pin 87.
  
  Fig 3: Checking Circuit 400 (LB/BK) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to PINPOINT TEST F to diagnose the accessory delay relay system.
- No : REPAIR the circuit. TEST the system for normal operation.
B4 CHECK CIRCUIT 57 (BK) FOR AN OPEN
- Key in OFF position.
- Measure the resistance between LF window control switch C504a pin 2, circuit 57 (BK) harness side and ground.
  
  Fig 4: Checking Circuit 57 (BK) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : INSTALL a new LF window control switch. REFER to SWITCH in this article.
- No : REPAIR the circuit. TEST the system for normal operation.