DTC B2A09: I-Call Button Circuit

Diagnosis start condition :

When ignition switch is ON.

DTC detecting condition :

The following conditions occur for at least 50 ms.

i-button impedance is more than 10 KΩ.
i-button is stuck for at least 60 seconds.

Trouble symptom :

i-Call function cannot be used.
RED LED illuminates.

Failure detection pattern :

Detection by a single system (Primary Failure)

Warning light/indicator light :

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

Wiring diagram :

Telematics Ref. to WIRING SYSTEM>TELEMATICS SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

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 B2A09 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 HARNESS (OPEN CIRCUIT) .
1. Turn the ignition switch to OFF.
2. Disconnect the telematics button connector.
3. Disconnect the DCM connector.
4. Using a tester, measure the resistance between the DCM connector and telematics button connector and between the telematics button connector and chassis ground.
  Connector & terminal
  
  (i105) No. 4 - (Rf32) No. 3 :
  
  (Rf32) No. 1 - Chassis ground :
Is the resistance 1 Ω or less?

Yes : GO TO 3.

No : Repair or replace the open circuit of harness.
CHECK HARNESS (GROUND SHORT CIRCUIT) .
Using a tester, measure the resistance between DCM connector and chassis ground.

Connector & terminal

(i105) No. 4 - Chassis ground :

Is the resistance 1 MΩ or more?

Yes : GO TO 4.

No : Repair or replace the short circuit of the harness.
CHECK THE CONNECTOR (SHORT CIRCUIT TO POWER SUPPLY) .
1. Turn the ignition switch to ON.
2. Measure the voltage between DCM connector/telematics button connector and chassis ground.
  Connector & terminal
  
  (i105) No. 4 (+) - Chassis ground (-) :
  
  (Rf32) No. 1 (+) - Chassis ground (-) :
Is the voltage less than 1 V?

Yes : GO TO 5.

No : Repair or replace the short circuit of the harness.
CHECK THE I-BUTTON .
1. Turn the ignition switch to OFF.
2. Measure the resistance of the i-button unit. Ref. to ENTERTAINMENT & MONITORING>SWITCHES AND HARNESS>INSPECTION .
Is the check result OK?

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

No : Replace the telematics button. Ref. to ENTERTAINMENT & MONITORING>SWITCHES AND HARNESS .