When The Rear Left Seat Switch Is Operated, The Rear Left Power Window Does Not Work In Automatic Operation. (With Off-Delay Function For All Seats)

Trouble causes: 

• Rear regulator and motor assembly LH malfunction
• Power window main switch failure
• Rear power window sub-switch LH malfunction
• LIN communication error
• Body integrated unit malfunction
• Harness malfunction
• Poor contact of connector
• Power supply circuit malfunction

Wiring diagram: 

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

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK MALFUNCTIONS  .
   1. Turn the ignition switch to ON.
   2. Operate the rear power window sub-switch LH and check that the power window (rear seat LH) works in manual operation.

   Does the power window operate manually according to switch operation?

   Yes  : Go to  2.

   No  : Perform the diagnosis for "When the rear left seat switch is operated, the rear left power window does not work in manual operation". Ref. to POWER WINDOW (DIAGNOSTICS) >DIAGNOSTICS WITH PHENOMENON>INSPECTION>WHEN THE REAR LEFT SEAT SWITCH IS OPERATED, THE REAR LEFT POWER WINDOW DOES NOT WORK IN MANUAL OPERATION. (WITH OFF-DELAY FUNCTION FOR ALL SEATS) 

2. CHECK DTC  .

   Using the Subaru Select Monitor, read the DTCs of [Power Window (Switch)] and [Power Window (Rear Left)]. Ref. to POWER WINDOW (DIAGNOSTICS) >DIAGNOSTIC TROUBLE CODE (DTC) 

   • Power Window (Switch)
   • Power Window (Rear Left)

   Are any DTCs displayed?

   Yes  : Perform the diagnosis for the displayed DTCs. Ref. to POWER WINDOW (DIAGNOSTICS) >DIAGNOSTIC TROUBLE CODE (DTC)>LIST 

   No  : Go to  3.

3. CHECK [ECU Control Mode] (DATA MONITOR)  .

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

   • ECU Control Mode

   Is [Initialized] displayed?

   Yes  : Go to  4.

   No  : Using the Subaru Select Monitor, perform [System Initialization] of [Power Window (Rear Left)]. Ref. to POWER WINDOW (DIAGNOSTICS) >WORK SUPPORT>OPERATION>SYSTEM INITIALIZATION 

   Then, perform the initial setting of the power window. Ref. to GLASS/WINDOWS/MIRRORS>POWER WINDOW SYSTEM>OPERATION

4. CHECK [One's Seat Switch] (DATA MONITOR)  .

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

   • One's Seat Switch

   Does the display change corresponding to the switch operation?

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

   No  : Go to  5.

5. CHECK REAR POWER WINDOW SUB-SWITCH LH  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the rear power window sub-switch LH connector.
   3. Perform unit inspection of rear power window sub-switch LH. Ref. to GLASS/WINDOWS/MIRRORS>POWER WINDOW CONTROL SWITCH>INSPECTION

   Is the check result OK?

   Yes  : Go to  6.

   No  : Replace the rear power window sub-switch LH. Ref. to GLASS/WINDOWS/MIRRORS>POWER WINDOW CONTROL SWITCH

6. CHECK HARNESS (OPEN CIRCUIT)  .
   1. Disconnect the rear regulator and motor assembly LH connector.
   2. Using a tester, measure the resistance between the rear power window sub-switch LH connector and the rear regulator & motor assembly LH connector.

      Connector & terminal 

      (Dr32) No. 1 - (Dr42) No. 4:

   Is the resistance less than 1 Ω?

   Yes  : Go to  7.

   No  : Repair the open circuit of harness between the rear power window sub-switch LH connector and the rear regulator & motor assembly LH connector.

7. CHECK HARNESS (SHORT CIRCUIT TO POWER SUPPLY)  .
   1. Turn the ignition switch to ON.
   2. Using a tester, measure the voltage between the rear power window sub-switch LH connector and chassis ground.

      Connector & terminal 

      (Dr32) No. 1 (+) - Chassis ground (-):

   Is the voltage less than 1 V?

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

   No  : Repair the short circuit to power supply in the harness between the rear power window sub-switch LH connector and the rear regulator and motor assembly LH connector.