Driver's Side Power Window Does Not Work

Trouble causes: 

• Front regulator & motor assembly (driver's side) power supply circuit failure
• Front regulator & motor assembly (driver's side) failure
• Power window main switch failure
• LIN communication error
• Body integrated unit malfunction

Wiring diagram: 

Power window system Refer to WIRING SYSTEM (IMPREZA MODEL)>POWER WINDOW SYSTEM>WIRING DIAGRAM . Refer to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>POWER WINDOW SYSTEM>WIRING DIAGRAM . Refer to WIRING SYSTEM (CROSSTREK MODEL (HEV))>POWER WINDOW SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK BATTERY. 

   Check the battery. Refer to STARTING/CHARGING SYSTEMS (H4DO (EXCEPT FOR HEV))>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. Refer to POWER WINDOW (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Are any DTCs displayed? (Current malfunction)

   Yes:  Perform the diagnosis for the displayed DTCs. Refer 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)]. Refer to POWER WINDOW (DIAGNOSTICS)>DATA MONITOR .
      • Power Supply Voltage

   Is the displayed voltage approximately 10.0 V or more?

   Yes:  Go to  4.

   No:  Replace the front regulator & motor assembly (driver's side). Refer 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)]. Refer to POWER WINDOW (DIAGNOSTICS)>DATA MONITOR .

   • Operation Enable Signal

   Is [ON] displayed?

   Yes:  Go to  5.

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

   If no fault is found in the body integrated unit, replace the front regulator & motor assembly (driver's side). Refer 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. Refer 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 connector (driver's side).
   3. Using a tester, measure the resistance between the body integrated unit connector and the front regulator & motor assembly (driver's side) connector.

      Connector & terminal 

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

      (D7) No. 11 - (D3) No. 6:

      (D7) No. 12 - (D3) No. 8:

   Is the resistance less than 10 Ω?

   Yes:  Replace the front regulator & motor assembly (driver's side). Refer 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 & motor assembly (driver's side) connector.