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

Failure detection pattern :

"Primary" (high-priority diagnosis)

Warning light/indicator light :

Both ON -
GREEN LED ON -
GREEN LED blinks -
RED LED ONO
RED LED blinks -
Both OFF -

CAUTION:

After the DCM is replaced, registrations of CommCheck and immobilizer system are required. Ref. to ENTERTAINMENT & MONITORING>TELEMATICS SYSTEM>OPERATION>REGISTRATION (COMM CHECK) .
Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to TELEMATICS SYSTEM (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .

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 code)

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.
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)>BATTERY .
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 code)

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

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