DTC B2C05: Sonar Control Module Power Supply

Outline of diagnosis: 

Voltage supply to the ignition power supply terminal and the battery power supply terminal was 16 V or more.

Time needed for diagnosis: 

200 ms

Recovery conditions: 

Ignition switch OFF → ON

Wiring diagram: 

Reverse Automatic Braking Ref. to WIRING SYSTEM>REVERSE ASSIST BRAKING SYSTEM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK CONNECTOR  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the RAB control module connector.
   3. Connect the disconnected connectors.
   4. Turn the ignition switch to ON.
   5. Read the DTC of [Reverse Assist Braking] using the Subaru Select Monitor. Ref. to REVERSE ASSIST BRAKING (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC B2C05 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. CHECK RAB CONTROL MODULE POWER SUPPLY CIRCUIT  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the RAB control module connector.
   3. Turn the ignition switch to ON.
   4. Using a tester, measure the voltage between the RAB control module connector and chassis ground.

      Connector & terminal 

      (R361) No. 1 (+) - Chassis ground (-):

      (R361) No. 13 (+) - Chassis ground (-):

   Is the voltage 16 V or less?

   Yes:  Replace the RAB control module. Ref. to REVERSE ASSIST BRAKING>REVERSE ASSIST BRAKING CONTROL MODULE .

   No:  Check the harness between the RAB control module connector and power supply.