DTC B2B49: RL 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 sub-switch is operated, the rear left window does not work.
• When the power window sub-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. SYSTEM INITIALIZATION  .
   1. Turn the ignition switch to ON.
   2. Using the Subaru Select Monitor, perform [System Initialization] of [Power Window (Rear Left)]. Ref. 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. 

   3. Perform the initial setting of the power window. Ref. to GLASS/WINDOWS/MIRRORS>POWER WINDOW SYSTEM>OPERATION .
   4. Operate the power window sub-switch and check that the power window (rear seat LH) operates.

   Does the power window operate normally according to switch operation?

   Yes  : 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. 

   No  : Go to  2.

2. CHECK DTC  .

   Read the DTC of [Power Window (Rear Left)] using the Subaru Select Monitor. Ref. to POWER WINDOW(DIAGNOSTICS) >OPERATION .

   Is DTC B2B49 displayed?

   Yes  : Replace the rear regulator and motor assembly LH. Ref. to GLASS/WINDOWS/MIRRORS>REMOVAL .

   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.