DTC B1247: Lost Communication With Tire Pressure Monitor Ecu

DTC detecting condition: 

BERKES communication data for TPMS cannot be received for over 10 seconds.

Trouble symptom: 

Wiring diagram: 

Tire pressure monitoring system Ref. to WIRING SYSTEM>TIRE PRESSURE MONITORING SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK HARNESS (OPEN CIRCUIT)  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the TPMS Control Module connector and the body integrated unit connector.
   3. Using a tester, measure the resistance of the harness between the TPMS Control Module connector and body integrated unit connector.

      Connector & terminal 

      (i362) No. 6 - (L83) No. 5:

      (i362) No. 7 - (L83) No. 4:

   Is the resistance less than 10 Ω?

   Yes:  Go to  2.

   No:  Repair or replace the open circuit of harness.

2. CHECK HARNESS (GROUND SHORT CIRCUIT)  .

   Using a tester, measure the resistance of the harness between the TPMS Control Module connector and chassis ground.

   Connector & terminal 

   (i362) No. 6 - Chassis ground:

   (i362) No. 7 - Chassis ground:

   Is the resistance 1 MΩ or more?

   Yes:  Go to  3.

   No:  Repair or replace the short circuit of the harness.

3. CHECK TPMS CONTROL MODULE POWER SUPPLY CIRCUIT  .
   1. Turn the ignition switch to ON.
   2. Using a tester, measure the voltage between the TPMS Control Module connector and chassis ground.

      Connector & terminal 

      (L83) No. 1 (+) - Chassis ground (-):

   Is the voltage 10 V or more?

   Yes:  Go to  4.

   No:  Repair the power supply circuit.

4. CHECK TPMS CONTROL MODULE GROUND CIRCUIT  .
   1. Turn the ignition switch to OFF.
   2. Using a tester, measure the resistance of the harness between the TPMS Control Module connector and chassis ground.

      Connector & terminal 

      (L83) No. 12 - Chassis ground:

   Is the resistance less than 10 Ω?

   Yes:  Replace the TPMS Control Module. Ref. to WHEEL AND TIRE SYSTEM>TIRE PRESSURE MONITORING SYSTEM .

   No:  Go to  5.

5. CHECK DTC  .
   1. Turn the ignition switch to ON.
   2. Using the Subaru Select Monitor, perform the clear memory of [Body Control]. Ref. to COMMON (DIAGNOSTICS)>CLEAR MEMORY .
   3. Read the DTC of [Body Control] using the Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC B1247 displayed? (Current code)

   Yes:  Replace the body integrated unit. Ref. to BODY CONTROL/COMMUNICATION SYSTEM>BODY INTEGRATED UNIT>REMOVAL .

   No:  Finish the diagnosis.