DTC B2772: Control Module Communication Stuck

DTC detecting condition: 

When all the following conditions are met.

• Battery voltage is 10 V or more.
• CAN bus is not in sleep state.
• Clear memory is not in process.
• CAN message register freezes in the TPMS and keyless entry control module or the keyless entry control module

Trouble symptom: 

• Communication is impossible with Subaru Select Monitor.
• Lock/unlock cannot be operated with keyless entry.

1. CHECK DTC  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the TPMS and keyless entry control module connector or keyless entry control module connector.
   3. Connect the disconnected connectors.
   4. Turn the ignition switch to ON.
   5. Using the Subaru Select Monitor, perform the clear memory of [Keyless Entry]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
   6. Turn the ignition switch to OFF.
   7. Turn the ignition switch to ON.
   8. Read the DTC of [Keyless Entry] using the Subaru Select Monitor. Ref. to Keyless Entry (Diagnostics)>Diagnostic Trouble Code (DTC) .

   Is DTC B2772 displayed? (Current malfunction)

   Yes  : Replace the TPMS and keyless entry control module or keyless entry control module. Ref. to SECURITY AND LOCKS>KEYLESS ENTRY CONTROL MODULE .

   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.