Pinpoint Test AK: Power Vent Windows Are Inoperative

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

AK1 CHECK CIRCUIT 882 (BN/YE) FOR GROUND
- Disconnect: RH Quarter Window Motor C4090.
- Measure the resistance between the RH quarter window motor C4090-2, circuit 882 (BN/YE), harness side and ground.
  
  Fig 1: Checking Circuit 882 (BN/YE) For Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes

GO to AK4

No

GO to AK2.
AK2 CHECK CIRCUIT 882 (BN/YE) FOR AN OPEN
- Disconnect: Quarter Window Switch C2981.
- Measure the resistance between the RH quarter window motor C4090-2, circuit 882 (BN/YE), harness side and the quarter window switch C2981-6, circuit 882 (BN/YE), harness side.
  
  Fig 2: Checking Circuit 882 (BN/YE) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes

GO to AK3

No

REPAIR the circuit. TEST the system for normal operation.
AK3 CHECK CIRCUIT 1205 (BK) FOR AN OPEN
- Measure the resistance between the RH quarter window switch C2981-8, circuit 1205 (BK), harness side and the ground.
  
  Fig 3: Checking Circuit 1205 (BK) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes

INSTALL a new quarter window switch. TEST the system for normal operation.

No

REPAIR the circuit. TEST the system for normal operation.
AK4 CHECK CIRCUIT 881 (BN) FOR GROUND
- Measure the resistance between the RH quarter window motor C4090-1, circuit 881 (BN), harness side and ground.
  
  Fig 4: Checking Circuit 881 (BN) For Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes

GO to AK6.

No

GO to AK5.
AK5 CHECK CIRCUIT 881 (BN) FOR AN OPEN
- Measure the resistance between the RH quarter window motor C4090-1, circuit 881 (BN), harness side and the quarter window switch C2981-7, circuit 881 (BN), harness side.
  
  Fig 5: Checking Circuit 881 (BN) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes

INSTALL a new quarter window switch. TEST the system for normal operation.

No

REPAIR the circuit. TEST the system for normal operation.
AK6 CHECK CIRCUIT 192 (PK) FOR VOLTAGE
- Disconnect: Quarter Window Switch C2981.
- Key in ON position.
- Measure the voltage between the quarter window switch C2981-5, circuit 194 (PK), harness side and ground.
  
  Fig 6: Checking Circuit 192 (PK) For Voltage
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes

GO to AK7

No

REPAIR the circuit. TEST the system for normal operation.
AK7 CHECK CIRCUIT 882 (BN/YE) FOR A SHORT TO GROUND
- Measure the resistance between the RH quarter window motor C4090-2, circuit 882 (BN/YE), harness side and ground.
  
  Fig 7: Checking Circuit 882 (BN/YE) For A Short To Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
Yes

GO to AK8

No

REPAIR the circuit. TEST the system for normal operation.
AK8 CHECK CIRCUIT 881 (BN) AND CIRCUIT 882 (BN/YE) FOR A SHORT TO GROUND
- Measure the resistance between the RH quarter window motor C4090-1, circuit 881 (BN), harness side and ground or LH quarter window motor C4048-1, circuit 882 (BN/YE), harness side and ground.
  
  Fig 8: Checking Circuit 881 (BN) And Circuit 882 (BN/YE) For A Short To Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
Yes

INSTALL a new quarter window switch. TEST the system for normal operation.

No

REPAIR the circuit. TEST the system for normal operation.