DTC B1011: Battery Control Power Supply

DTC detecting condition: 

• Voltage failure caused by poor contact of battery power supply control circuit
• Battery voltage of body integrated unit is not within the range of 8.5 - 16.5 V.

Trouble symptom: 

Functions of body integrated unit stop.

Wiring diagram: 

Immobilizer system Refer to WIRING SYSTEM>IMMOBILIZER SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DTC. 

   Read the DTC of body integrated unit using Subaru Select Monitor. Refer to BODY CONTROL SYSTEM (DIAGNOSTICS)>READ DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC B1011 displayed? (Current malfunction)

   Yes:  Go to  2.

   No:  Go to  5.

2. CHECK DTC. 
   1. Turn the ignition switch to OFF.
   2. Disconnect and then connect the body integrated unit connector.
   3. Wait approx. 2 minutes.
   4. Turn the ignition switch to ON.
   5. Read the DTC of body integrated unit using Subaru Select Monitor. Refer to BODY CONTROL SYSTEM (DIAGNOSTICS)>READ DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC B1011 displayed? (Current malfunction)

   Yes:  Go to  3.

   No:  Go to  5.

3. CHECK FUSE. 
   1. Turn the ignition switch to OFF.
   2. Check the fuse.

   Is the check result OK?

   Yes:  Go to  4.

   No:  Replace the defective fuse.

4. CHECK HARNESS. 
   1. Disconnect the body integrated unit connector.
   2. Using the tester, measure the voltage between terminals.

      Connector & terminal 

      (i84) No. 6 (+) - Chassis ground (-):

   Is the voltage 8.5 - 16.5 V?

   Yes:  Replace the body integrated unit. Refer to SECURITY AND LOCKS>BODY INTEGRATED UNIT .

   No:  Repair the harness between body integrated unit and fuse.

5. CHECK CONNECTOR. 
   1. Turn the ignition switch to OFF.
   2. Disconnect the body integrated unit connector.

   Is there poor contact of connector?

   Yes:  Repair or replace the poor contact of connector.

   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.