DTC B2A0A: Red Led Circuit

Diagnosis start condition:

When ACC is ON.

DTC detecting condition:

The following conditions occur for at least 50 ms.

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

Trouble symptom:

LED does not illuminate.

Wiring diagram:

Telematics Ref. to WIRING SYSTEM (IMPREZA MODEL)>TELEMATICS SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>TELEMATICS SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (HEV))>TELEMATICS SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

CAUTION:

After the Data Communication Module is replaced, registrations of COMM Check 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 .
Read the DTC of [Telematics] using the Subaru Select Monitor. Ref. to TELEMATICS SYSTEM (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

Is DTC B2A0A displayed? (Current malfunction)

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 .
- RED LED Lighting
Does the LED light 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.
CHECK HARNESS (OPEN CIRCUIT) .
1. Turn the ignition switch to OFF.
2. Disconnect the telematics button connector.
3. Disconnect the Data Communication Module connector.
4. Measure the resistance between telematics button connector and Data Communication Module connector.
  Connector & terminal
  
  (i270) No. 13 - (R463) No. 7:
  
  (R463) No. 1 - Chassis ground:
  
  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 Data Communication Module connector and chassis ground.

Connector & terminal

(i270) No. 13 - 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 Data Communication Module connector and chassis ground.
  Connector & terminal
  
  (i270) No. 13 (+) - Chassis ground (-):
  
  (R463) 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. After the repair. Go to 7.
CHECK THE TELEMATICS BUTTON (LED) UNIT .
1. Turn the ignition switch to OFF.
2. Check that the telematics button (LED) illuminates when battery voltage is applied to the telematics button (LED) unit.
  CAUTION: Never connect the battery voltage terminals in reverse polarity, because reversed connection damages the telematics button (LED).
  
  Terminal
  
  No. 7 (+) - No. 1 (-):
  
  Does the telematics button (LED) illuminate?
  
  Yes : Replace the Data Communication Module. Ref. to ENTERTAINMENT & MONITORING>DATA COMMUNICATION MODULE .
  
  No : Replace the telematics button. Ref. to ENTERTAINMENT & MONITORING>SWITCHES AND HARNESS .
CHECK THE TELEMATICS BUTTON LED UNIT .
1. Turn the ignition switch to OFF.
2. Check that the telematics button (LED) illuminates when battery voltage is applied to the telematics button (LED) unit.
  CAUTION: Never connect the battery voltage terminals in reverse polarity, because reversed connection damages the telematics button (LED).
  
  Terminal
  
  No. 7 (+) - No. 1 (-):
  
  Does the telematics button (LED) illuminate?
  
  Yes : The telematics button (LED) is not malfunctioning. Finish the diagnosis.
  
  No : Replace the telematics button. Ref. to ENTERTAINMENT & MONITORING>SWITCHES AND HARNESS .