Driver's Side Power Window Does Not Work

Trouble causes: 

• Front regulator and motor assembly LH power supply circuit failure
• Front regulator and motor assembly LH failure
• Power window main switch failure
• LIN communication error
• Body integrated unit malfunction

Wiring diagram: 

Power window system Ref. to WIRING SYSTEM>Power Window System>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK BATTERY  .

   Check the battery. Ref. to STARTING/CHARGING SYSTEMS (H4DOTC)>Battery>INSPECTION .

   Is the battery OK?

   Yes  : Go to  2.

   No  : Charge or replace the battery.

2. CHECK DTC  .

   Read the DTC of [Power Window (Driver)] using the Subaru Select Monitor. Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) .

   Are any DTCs displayed? (Current malfunction)

   Yes  : Perform the diagnosis for the displayed DTCs. Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST .

   No  : Go to  3.

3. CHECK Power Supply Voltage (DATA MONITOR)  .
   1. Turn the ignition switch to ON.
   2. Using the Subaru Select Monitor, check the following items in the [Data monitor] of [Power Window (Driver)] Ref. to POWER WINDOW (DIAGNOSTICS)>DATA MONITOR .
   • Power Supply Voltage

   Is the displayed voltage approximately 8.0 V or more?

   Yes  : Go to  4.

   No  : Inspect the body integrated unit. Ref. to BODY CONTROL (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

   If no fault is found in the body integrated unit, replace the front regulator and motor assembly LH. Ref. to GLASS/WINDOWS/MIRRORS>FRONT REGULATOR AND MOTOR ASSEMBLY .

4. CHECK Operation Enable Signal (DATA MONITOR)  .

   Using the Subaru Select Monitor, check the following items in the [Data monitor] of [Power Window (Driver)]. Ref. to POWER WINDOW (DIAGNOSTICS)>DATA MONITOR .

   • Operation Enable Signal

   Is [ON] displayed?

   Yes  : Go to  5.

   No  : Inspect the body integrated unit. Ref. to BODY CONTROL (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

   If no fault is found in the body integrated unit, replace the front regulator and motor assembly LH. Ref. to GLASS/WINDOWS/MIRRORS>FRONT REGULATOR AND MOTOR ASSEMBLY .

5. CHECK POWER WINDOW MAIN SWITCH  .

   Operate the power window main switch and roll down the window to the full open position. Operate the power window main switch and roll up the window to the full close position.

   Does the window roll up and down?

   Yes  : Go to  6.

   No  : Replace the power window main switch. Ref. to GLASS/WINDOWS/MIRRORS>POWER WINDOW CONTROL SWITCH .

6. CHECK HARNESS (OPEN CIRCUIT)  .
   1. Disconnect the power window main switch connector.
   2. Disconnect the front regulator & motor assembly LH connector.
   3. Using a tester, measure the resistance between the body integrated unit connector and the front regulator and motor assembly LH connector.

   Connector & terminal 

   (i81) No. 2 - (D3) No. 7:

   Is the resistance less than 10 Ω?

   Yes  : Replace the front regulator and motor assembly LH. Ref. to GLASS/WINDOWS/MIRRORS>FRONT REGULATOR AND MOTOR ASSEMBLY .

   No  : Repair the open circuit of harness between the body integrated unit connector and the front regulator and motor assembly LH connector.