DTC B2A06: Right Speaker/Audio Circuit

Diagnosis start condition:

After turning the ignition switch to OFF, open and close the door and wait for 5 minutes or more before turning the ignition switch to ON or performing the active test for the speaker using Subaru Select Monitor.

DTC detecting condition:

Speaker impedance is more than 10 kΩ for 100 ms. (Detached speaker connection, etc.)

Trouble symptom:

Call function cannot be used.
RED LED illuminates.

Wiring diagram:

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

Without audio amplifier

Courtesy of SUBARU OF AMERICA, INC.
With audio amplifier

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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 B2A06 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.
PERFORM ACTIVE TEST .
Using the Subaru Select Monitor, check the following items in the [Active Test] of [Telematics]. Ref. to TELEMATICS SYSTEM (DIAGNOSTICS)>ACTIVE TEST
- Speaker ON
Does it sound?

Yes : 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.

No : Go to 3.
CHECK HARNESS (OPEN CIRCUIT) .
1. Turn the ignition switch to OFF.
2. Disconnect the speaker connector and tweeter connector.
3. Disconnect the DCM connector.
4. Measure the resistance between speaker connector and tweeter connector and DCM connector.
  Connector & terminal
  
  Without audio amplifier
  
  (i106) No. 4 - (Df57) No. 2:
  
  (i106) No. 4 - (i197) No. 1:
  
  (i106) No. 12 - (Df57) No. 1:
  
  (i106) No. 12 - (i197) No. 3:
  
  With audio amplifier
  
  (i106) No. 4 - (i197) No. 3:
  
  (i106) No. 12 - (i197) No. 4:
Is the resistance 1 Ω or less?

Yes : Go to 4.

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

Connector & terminal

(i106) No. 4 - Chassis ground:

(i106) No. 12 - Chassis ground:

Is the resistance 1 MΩ or more?

Yes : Go to 5.

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 and chassis ground.
  Connector & terminal
  
  (i106) No. 4 (+) - Chassis ground (-):
  
  (i106) No. 12 (+) - Chassis ground (-):
Is the voltage less than 1 V?

Yes : Go to 6.

No : Repair or replace the short circuit of the harness.

CHECK THE SPEAKER .

Turn the ignition switch to OFF.

Using a tester, measure the internal resistance of each speaker.

Terminals

Without audio amplifier

Side tweeter (in the figure below)

No. 1 - No. 2:

Courtesy of SUBARU OF AMERICA, INC.

Front door speaker

No. 1 - No. 2:

With audio amplifier

Side tweeter

No. 3 - No. 4:

Is the resistance 3.2 Ω or more? (Side tweeter without audio amplifier)

Is the resistance 3.1 Ω or more? (Front door speaker without audio amplifier)

Is the resistance 3.4 Ω or more? (Side tweeter with audio amplifier)

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

No : Replace the speaker and tweeter. Ref. to ENTERTAINMENT & MONITORING>FRONT SPEAKER