AWD Warning Light Display: Inspection

Diagnosis: 

• 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. 

   Check the DTC relating the TCM using the Subaru Select Monitor.

   Is DTC U0155 or U0423 displayed?

   • Yes  : Perform the self-diagnosis of combination meter.
   • No  : Go to 2. 
2. CHECK TCM. 

   Check the DTC relating the TCM using the Subaru Select Monitor.

   Are DTCs other than U0155 and U0423 displayed?

   • Yes  : Perform the diagnosis according to DTC.
   • No  : Go to 3. 
3. CHECK COMBINATION METER. 

   Check the DTC of combination meter.

   Are any DTCs displayed?

   • Yes  : Perform the diagnosis according to DTC.
   • 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 relating the TCM using the Subaru Select Monitor.

   Are any DTCs displayed?

   • Yes  : Perform the diagnosis according to DTC.
   • 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] display, and check the current mode. Ref. to AWD CONTINUOUSLY VARIABLE TRANSMISSION(TR580)>AWD ON/OFF Switching Mode . Ref. to AWD CONTINUOUSLY VARIABLE TRANSMISSION(TR690)>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 "ON", 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 there any trouble with the combination meter?

    • Yes  : Repair the combination meter.
    • No  : Check the TCM.