Power Window Regulator

Trouble symptom:

Cannot communicate with [Power Window (Driver)], [Power Window (Passenger)], [Power Window (Rear Right)] or [Power Window (Rear Left)].

Detecting condition:

Defective harness connector
Power supply circuit malfunction
Defective CAN communication circuit
Defective Subaru Select Monitor

Wiring diagram:

Power window system Ref. to WIRING SYSTEM>POWER WINDOW SYSTEM>WIRING DIAGRAM . CAN communication system Ref. to WIRING SYSTEM>CAN COMMUNICATION SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to POWER WINDOW (DIAGNOSTICS)>General Description>CAUTION .

CHECK BATTERY TERMINAL .
Check battery terminal.

Is there poor contact at battery terminal?

Yes: Replace or tighten the battery terminal.

No: Go to 2 .
CHECK IGNITION SWITCH .
Check the ignition switch.

Is the ignition switch ON?

Yes: Go to 3 .

No: Turn the ignition switch to ON, and Go to 3 .
CHECK BATTERY .
1. Turn the ignition switch to OFF.
2. Check the battery. Ref. to STARTING/CHARGING SYSTEMS (H4DO)>BATTERY . Ref. to STARTING/CHARGING SYSTEMS (H4DOTC)>BATTERY .
Is the battery OK?

Yes: Go to 4 .

No: Charge or replace the battery.
CHECK LAN SYSTEM .
Perform the diagnosis for LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

Is LAN system OK?

Yes: Go to 5 .

No: Perform the inspection according to the diagnosis for LAN system.
CHECK POWER WINDOW REGULATOR CONNECTOR .
1. Turn the ignition switch to OFF.
2. Check power window regulator connector.
Is the power window regulator connector inserted into the power window regulator until the clamp locks?

Yes: Go to 6 .

No: Insert the power window regulator connector into the power window regulator.
CHECK SUBARU SELECT MONITOR COMMUNICATION .
1. Turn the ignition switch to ON.
2. Using the Subaru Select Monitor, check whether the communication with [Power Window (Driver)], [Power Window (Passenger)], [Power Window (Rear Right)] and [Power Window (Rear Left)] can be executed normally.
Is communication performed normally?

Yes: Using the Subaru Select Monitor, read DTCs of [Power Window (Driver)], [Power Window (Passenger)], [Power Window (Rear Right)] and [Power Window (Rear Left)], and perform the diagnosis for the displayed DTCs. Ref. to Power Window (Diagnostics)>Diagnostic Trouble Code (DTC) .

No: Go to 7 .
CHECK POWER SUPPLY CIRCUIT .
1. Disconnect the power window regulator connector.
2. Turn the ignition switch to ON. (Engine OFF)
3. Using a tester, measure the ignition power supply voltage between the power window regulator connector and chassis ground.
  Connector and terminal
  
  Driver's seat
  
  (Df52) No. 5 (+) - Chassis ground (-):
  
  Passenger's seat
  
  (Df51) No. 5 (+) - Chassis ground (-):
  
  Rear seat RH
  
  (Dr41) No. 5 (+) - Chassis ground (-):
  
  Rear seat LH
  
  (Dr42) No. 5 (+) - Chassis ground (-):
Is the voltage 10 - 15 V?

Yes: Go to 8 .

No: Repair the open circuit of harness between the power window regulator and battery.
CHECK HARNESS BETWEEN POWER WINDOW REGULATOR AND CHASSIS GROUND .
1. Turn the ignition switch to OFF.
2. Using a tester to measure the harness resistance between the power window regulator connector and chassis ground.
  Connector and terminal
  
  Driver's seat
  
  (Df52) No. 1 - Chassis ground:
  
  Passenger's seat
  
  (Df51) No. 1 - Chassis ground:
  
  Rear seat RH
  
  (Dr41) No. 1 - Chassis ground:
  
  Rear seat LH
  
  (Dr42) No. 1 - Chassis ground:
Is the resistance less than 1 Ω?

Yes: Go to 9 .

No: Repair the open circuit of the power window regulator ground circuit and the poor contact of connector.
CHECK POOR CONTACT OF CONNECTORS .
Check the power window regulator power supply circuit, ground circuit, or data link connector for poor contact.

Is there poor contact in the power window regulator power supply circuit, ground circuit, or data link connector?

Yes: Repair the poor contact of connector.

No: If initialization communication using Select Monitor is impossible at this time, replace the power window regulator. If the communication is possible, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.