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 main switch is operated, the rear left window does not work in automatic operation.

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)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC B2B49 displayed?

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