AWD Warning Light Display: Diagnosis

Detecting condition: 

• CAN communication is lost with the combination meter.
• Combination meter malfunction
• TCM is in AWD special control mode.

Trouble symptom: 

• When the ignition switch is turned to ON, the AWD light does not illuminate.
• AWD light remains lit after engine start.
• AWD light is blinking immediately after engine start.

1. CHECK TCM  .

   Read the DTC of [Transmission] using the Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC U0155 or U0423 displayed?

   Yes  : Perform the self-diagnosis of combination meter. Ref. to INSTRUMENTATION/DRIVER INFO>COMBINATION METER SYSTEM>OPERATION>SELF-DIAGNOSIS DISPLAY MODE .

   No  : Go to  2 .

2. CHECK TCM  .

   Read the DTC of [Transmission] using the Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Are DTCs other than U0155 and U0423 displayed?

   Yes  : Perform the diagnosis according to the DTC. Ref. to TRANSMISSION (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST .

   No  : Go to  3 .

3. CHECK COMBINATION METER  .

   Read the DTC of [Combination Meter] using the Subaru Select Monitor. Ref. to COMBINATION METER (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Are any DTCs displayed?

   Yes  : Perform the diagnosis according to the DTC. Ref. to COMBINATION METER (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

   No  : Go to  4 .

4. CHECK AWD LIGHT  .

   Turn the ignition switch to ON.

   Does AWD light illuminate and then go off in 2 seconds?

   Yes  : Go to  5 .

   No  : Perform the self-diagnosis of combination meter. Ref. to INSTRUMENTATION/DRIVER INFO>COMBINATION METER SYSTEM>OPERATION>SELF-DIAGNOSIS DISPLAY MODE .

5. CHECK AWD LIGHT  .

   Start the engine.

   Does the AWD light go off?

   Yes  : Current condition is normal. Go back to Basic Diagnostic Procedure. Ref. to TRANSMISSION (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

   No  : Go to  6 .

6. CHECK DTC  .

   Read the DTC of [Transmission] using the Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Are any DTCs displayed?

   Yes  : Perform the diagnosis according to the DTC. Ref. to TRANSMISSION (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST .

   No  : Go to  7 .

7. CHECK AWD LIGHT  .

   Check the display of AWD light after engine start.

   Is AWD light illuminating?

   Yes  : Go to  9 .

   No  : Go to  8 .

8. CHECK AWD LIGHT  .

   Check the display of AWD light after engine start.

   Is AWD light blinking at 2 Hz?

   Yes  : Go to  10 .

   No  : Go to  11 .

9. CHECK AWD ON/OFF SWITCHING FUNCTION  .

   Using the Subaru Select Monitor, select [AWD ON/OFF switching mode] on the [Work Support] screen, and check the current mode. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>AWD ON/OFF SWITCHING MODE .

   Is the message [At present, the vehicle is in AWD. Switch to FF?] displayed?

   Yes  : Go to  11 .

   No  : If the message [At present, the vehicle is in FF. Switch to AWD?] is displayed, select "OK", and switch to AWD mode.

10. CHECK REAR DIFFERENTIAL  .

    Using the Subaru Select Monitor, select and check [Rear differential inspection mode] on the [Work Support] display. Ref. to DIFFERENTIALS>REAR DIFFERENTIAL INSPECTION MODE .

    Does AWD light go off after inspection is finished normally?

    Yes  : Current condition is normal. Go back to Basic Diagnostic Procedure. Ref. to TRANSMISSION (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

    No  : Go to  11 .

11. CHECK COMBINATION METER  .

    Perform the self-diagnosis of combination meter. Ref. to INSTRUMENTATION/DRIVER INFO>COMBINATION METER SYSTEM>OPERATION>SELF-DIAGNOSIS DISPLAY MODE .

    Is the check result OK?

    Yes  : Replace the TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>TRANSMISSION CONTROL MODULE (TCM) .

    No  : Repair or replace the combination meter. Ref. to INSTRUMENTATION/DRIVER INFO>COMBINATION METER .