DTC B2A16: Immobilizer Key Collation

Diagnosis start condition: 

When ignition switch is ON.

DTC detecting condition: 

When DCM received a remote request and couldn't detect valid cryptographic key within three seconds.

Trouble symptom: 

RED LED ON

1. CHECK DTC  .
   1. Turn the ignition switch to ON.
   2. Read the DTC of [Telematics] using the Subaru Select Monitor. Ref. to TELEMATICS SYSTEM (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC B2A16 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 DCM POWER SUPPLY  .

   Using the Subaru Select Monitor, check the following items in the [Data monitor] of [Telematics]. Ref. to TELEMATICS SYSTEM (DIAGNOSTICS)>DATA MONITOR .

   • Battery voltage

   Is the voltage 9 - 16 V?

   Yes:  Go to  3.

   No:  Replace the battery and Go to  3. Ref. to STARTING/CHARGING SYSTEMS (H4DO (EXCEPT FOR HEV))>BATTERY>REMOVAL .

3. PERFORM IMMOBILIZER SYSTEM RE-REGISTRATION  .

   Perform re-registration of immobilizer system for DCM using the Subaru Select Monitor. Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.

   NOTE: "Telematics control module", which is described in "REGISTRATION MANUAL FOR IMMOBILIZER", is described as "DCM" in the service information.

   Is registration complete?

   Yes:  Go to  4.

   No:  Refer to "Correspondence table when registration is not possible" in the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.

4. CHECK DTC  .

   Read the DTC of [Telematics] using the Subaru Select Monitor. Ref. to TELEMATICS SYSTEM (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC B2A16 displayed? (Current malfunction)

   Yes:  Replace the DCM. Ref. to ENTERTAINMENT & MONITORING>DATA COMMUNICATION MODULE .

   No:  Immobilizer system for DCM is not registered. Function returned to normal.