DTC B2A0B: Green Led Circuit

Diagnosis start condition: 

When ACC is ON.

DTC detecting condition: 

The following conditions occur for at least 50 ms.

• Current in GREEN LED is less than 1 mA. (Improper GREEN LED connection, etc.)
• Current in GREEN LED is more than 200 mA. (Short-circuited GREEN LED, etc.)

Trouble symptom: 

RED LED illuminates.

Wiring diagram: 

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

Courtesy of SUBARU OF AMERICA, INC.

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 B2A0B 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. 

2. 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 

   • GREEN LED Lighting

   Does the GREEN LED illuminate?

   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.

3. 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. 3 - (Rf32) No. 4:

      (Rf32) No. 1 - Chassis ground:

   Is the resistance 1 Ω or less?

   Yes  : Go to  4.

   No  : Repair or replace the open circuit of harness.

4. CHECK HARNESS (GROUND SHORT CIRCUIT)  .

   Using a tester, measure the resistance between DCM connector and chassis ground.

   Connector & terminal 

   (i105) No. 3 - Chassis ground:

   Is the resistance 1 MΩ or more?

   Yes  : Go to  5.

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

5. CHECK THE CONNECTOR (SHORT CIRCUIT TO POWER SUPPLY)  .
   1. Turn the ignition switch to ON.
   2. Using a tester, measure the voltage between the DCM connector and chassis ground and between the telematics button connector and chassis ground.

      Connector & terminal 

      (i105) No. 3 (+) - Chassis ground (-):

      (Rf32) No. 1 (+) - Chassis ground (-):

   Is the voltage less than 1 V?

   Yes  : Go to  6.

   No  : Repair or replace the short circuit of the harness. Go to  7.

6. CHECK THE TELEMATICS BUTTON (GREEN LED) UNIT  .
   1. Turn the ignition switch to OFF.
   2. Check that GREEN LED illuminates when applying the battery voltage to it.
      CAUTION:

      Never connect the battery voltage terminals in reverse polarity, because reversed connection damages the telematics button (LED). 

      Terminals 

      No. 4 (+) - No. 1 (-):

   Does the GREEN LED illuminate?

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

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

7. CHECK THE TELEMATICS BUTTON (GREEN LED) UNIT  .
   1. Turn the ignition switch to OFF.
   2. Check that the telematics button (GREEN LED) illuminates when battery voltage is applied to the telematics button (GREEN LED) unit.
      CAUTION:

      Never connect the battery voltage terminals in reverse polarity, because reversed connection damages the telematics button (LED). 

      Terminals 

      No. 4 (+) - No. 1 (-):

   Does the telematics button (GREEN LED) illuminate?

   Yes  : Telematics button (GREEN LED) is not malfunctioning. Finish the diagnosis.

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