DTC B2B16: RL Door Power Window Driver's Door Auto Switch Stuck

DTC detecting condition: 

When AUTO SW signal ON is received for 20±1 seconds or longer.

Trouble symptom: 

• When the power window main switch is operated, the rear left window does not work.
• When the power window main switch is operated, the rear left window rolls down only in manual down operation, or inches up. (Inch up: Operating the switch rolls up the window about 10 mm only)

1. CHECK DTC  .

   Read the DTC of [Power Window (Switch)] using the Subaru Select Monitor. Ref. to Power Window (Diagnostics)>Diagnostic Trouble Code (DTC) .

   Is DTC B2B50 displayed? (Current malfunction)

   Yes:  Perform the diagnosis of DTC B2B50. Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B50: POWER WINDOW MAIN SWITCH FAILURE .

   No:  Go to  2 .

2. CHECK REAR REGULATOR AND MOTOR ASSEMBLY  .

   Using the Subaru Select Monitor, check the following items in the [Active Test] of [Power Window (Rear Left)]. Ref. to Power Window (Diagnostics)>Active Test .

   • Power Window Operation Test

   Does the window roll up and down?

   Yes:  Replace the power window main switch, and Go to  3 . Ref. to GLASS/WINDOW/MIRRORS>POWER WINDOW CONTROL SWITCH .

   No:  Replace the rear regulator and motor assembly LH. Ref. to GLASS/WINDOW/MIRRORS>REAR REGULATOR AND MOTOR ASSEMBLY .

3. CHECK DTC  .

   Read the DTC of [Power Window (Rear Left)] using the Subaru Select Monitor. Ref. to Power Window (Diagnostics)>Diagnostic Trouble Code (DTC) .

   Is DTC B2B16 displayed? (Current malfunction)

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

   No:  Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

   NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.