Pinpoint Test A: All the Power Windows are Inoperative

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Power Windows for schematic and connector information.

Normal Operation 

With the key in the ACC or RUN position the voltage is supplied to the coil side of the accessory relay through circuit 964 (DB/LG). When the accessory relay is energized, battery voltage is supplied to the driver window control switch on circuit 193 (YE/LG). The driver window control switch provides voltage and ground to all other window control switches. The driver window control switch is grounded through circuit 57 (BK).

This pinpoint test is intended to diagnose the following:

• Fuse(s)
• Circuit breaker
• Wiring, terminals or connectors
• Accessory relay
• Driver window control switch

PINPOINT TEST A: ALL THE POWER WINDOWS ARE INOPERATIVE 

1. A1 CHECK CIRCUIT 193 (YE/LG) FOR VOLTAGE 
   • Disconnect: Driver Window Control Switch C504b
   • Key in ON position.
   Fig 1: Checking Circuit for Voltage
   Courtesy of FORD MOTOR CO.
   • Measure the voltage between driver window control switch C504b-8, circuit 193 (YE/LG), harness side and ground.
   • Is the voltage greater than 10 volts? 
   1. YES  : Go to  A2.
   2. NO  : Go to  A3.
2. A2 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
   Fig 2: Checking Circuit For Open
   Courtesy of FORD MOTOR CO.
   • Measure the resistance between driver window control switch C504b-5, circuit 57 (BK), harness side and ground.
   • Is the resistance less than 5 ohms? 
   1. YES  : INSTALL a new driver window control switch. REFER to Window Control Switch . TEST the system for normal operation.
   2. NO  : REPAIR the circuit. TEST the system for normal operation.
3. A3 CHECK CIRCUIT 193 (YE/LG) FOR AN OPEN OR A SHORT TO GROUND 
   • Disconnect: Accessory Relay
   Fig 3: Checking Circuit For Open Or Short To Ground
   Courtesy of FORD MOTOR CO.
   • Measure the resistance between driver window control switch C504b-8, circuit 193 (YE/LG), harness side and the accessory relay pin 87, circuit 193 (YE/LG), harness side; and between driver window control switch C504b-8, circuit 193 (YE/LG), harness side and ground.
   • Is the resistance less than 5 ohms between the driver window control switch and the accessory relay, and greater than 10,000 ohms between the driver window control switch and ground? 
   1. YES  : Go to  A4.
   2. NO  : REPAIR the circuit. TEST the system for normal operation.
4. A4 CHECK CIRCUIT 768 (BN/YE) FOR VOLTAGE 
   Fig 4: Checking Circuit for Voltage
   Courtesy of FORD MOTOR CO.
   • Measure the voltage between accessory relay pin 30, circuit 768 (BN/YE), harness side and ground.
   • Is the voltage greater than 10 volts? 
   1. YES  : Go to  A5.
   2. NO  : VERIFY the battery junction box (BJB) circuit breaker 602 (20A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
5. A5 CHECK CIRCUIT 964 (DB/LG) FOR VOLTAGE 
   Fig 5: Checking Circuit for Voltage
   Courtesy of FORD MOTOR CO.
   • Measure the voltage between accessory relay pin 86, circuit 964 (DB/LG), harness side and ground.
   • Is the voltage greater than 10 volts? 
   1. YES  : Go to  A6.
   2. NO  : VERIFY the central junction box (CJB) fuse 9 (7.5A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
6. A6 CHECK THE ACCESSORY DELAY RELAY CIRCUIT 57 (BK) FOR AN OPEN 
   Fig 6: Checking Circuit For Open
   Courtesy of FORD MOTOR CO.
   • Measure the resistance between accessory relay pin 85, circuit 57 (BK), harness side and ground.
   • Is the resistance less than 5 ohms? 
   1. YES  : INSTALL a new accessory relay. TEST the system for normal operation.
   2. NO  : REPAIR the circuit. TEST the system for normal operation.