DTC B2B09: Driver's Door Power Window Control Module EEPROM

DTC detecting condition: 

When one of the following data cannot be read from the non-volatile memory as the CPU is reset.

• Window position
• Sliding learn value
• Initialization completed state
• Full open stop position

Trouble symptom: 

• When the power window main switch is operated, driver's side window does not work.
• When the power window main switch is operated, driver's side 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. INITIALIZATION BY POWER WINDOW SWITCH (DRIVER'S SIDE). 
   1. Perform initialization using the power window switch. Refer to POWER WINDOW (DIAGNOSTICS)>WORK SUPPORT>NOTE .
   2. Read the DTC of [Power Window (Driver)] using the Subaru Select Monitor. Refer to POWER WINDOW (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

      Is DTC B2B09 displayed? (Current malfunction)

      Yes:  Go to  2.

      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.
2. SYSTEM INITIALIZATION. 
   1. Using the Subaru Select Monitor, perform [System Initialization] of [Power Window (Driver)].

      Refer to POWER WINDOW (DIAGNOSTICS)>WORK SUPPORT>OPERATION>SYSTEM INITIALIZATION .

      NOTE: Record the DTCs and FFD because they will be erased when the initialization is performed.
   2. Read the DTC of [Power Window (Driver)] using the Subaru Select Monitor. Refer to POWER WINDOW (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

      Is DTC B2B09 displayed? (Current malfunction)

      Yes:  Replace the front regulator & motor assembly (driver's side). Refer to GLASS/WINDOWS/MIRRORS>FRONT 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.