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

Trouble causes:

Rear regulator and motor assembly LH malfunction
Power window main switch failure
Rear power window sub-switch LH 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.

CAUTION:

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

CHECK WINDOW LOCK SWITCH .
Check the window lock switch.

Is the window lock switch OFF?

Yes : Go to 2.

No : Turn the window lock switch to OFF and operate.
CHECK REAR POWER WINDOW SWITCH .
Perform unit inspection of rear power window switch. Ref. to GLASS/WINDOWS/MIRRORS>POWER WINDOW CONTROL SWITCH>INSPECTION

Is the rear power window switch OK?

Yes : Go to 3.

No : Replace the rear power window switch. Ref. to GLASS/WINDOWS/MIRRORS>POWER WINDOW CONTROL SWITCH
CHECK POWER SUPPLY CIRCUIT (OPEN) .
1. Turn the ignition switch to OFF.
2. Disconnect the rear power window switch connector.
3. Turn the ignition switch to ON.
4. Using a tester, measure the voltage between the rear power window switch connector and chassis ground.
  Connector & terminal
  
  (Dr32) No. 3 (+) - Chassis ground (-):
Is the voltage 10 - 15 V?

Yes : Go to 4.

No : Repair the power supply circuit.
CHECK HARNESS (OPEN CIRCUIT) .
1. Turn the ignition switch to OFF.
2. Disconnect the power window main switch connector.
3. Using a tester, measure the resistance between the power window main switch connector and rear power window switch connector.
  Connector & terminal
  
  (Dr32) No. 1 - (Df34) No. 9:
  
  (Dr32) No. 5 - (Df34) No. 8:
Is the resistance less than 1 Ω?

Yes : Go to 5.

No : Repair the open circuit of harness between the power window main switch connector and the rear power window switch connector.
CHECK HARNESS (OPEN CIRCUIT) .
1. Turn the ignition switch to OFF.
2. Disconnect the rear regulator & motor assembly connector.
3. Using a tester, measure the resistance between the rear power window switch connector and the rear regulator & motor assembly connector.
  Connector & terminal
  
  (Dr32) No. 2 - (Dr42) No. 2:
  
  (Dr32) No. 4 - (Dr42) No. 1:
Is the resistance less than 1 Ω?

Yes : Perform unit inspection of the rear regulator & motor assembly. Ref. to GLASS/WINDOWS/MIRRORS>REAR REGULATOR AND MOTOR ASSEMBLY>INSPECTION

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