DTC B2A05: Left Speaker/Audio Circuit

Diagnosis start condition:

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

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.

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 .

Wiring diagram:

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

Courtesy of SUBARU OF AMERICA, INC.

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

Is DTC B2A05 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.

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.

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.
3. Disconnect the DCM connector.
4. Measure the resistance between speaker connector and DCM connector.
  Connector & terminal
  
  (i106) No. 2 - (Df58) No. 2:
  
  (i106) No. 10 - (Df58) No. 1:
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. 2 - Chassis ground:

(i106) No. 10 - 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. 2 (+) - Chassis ground (-):
  
  (i106) No. 10 (+) - 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 .
1. Turn the ignition switch to OFF.
2. Check the speaker unit. Ref. to ENTERTAINMENT & MONITORING>FRONT SPEAKER>INSPECTION .
Is the check result OK?

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

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