Diagnostic Procedure For Subaru Select Monitor Communication: Inspection

Detecting Condition:  Defective Harness Connector

Trouble Symptom: 

Communication Is Impossible Between The Steering Angle Sensor And Subaru Select Monitor.

Wiring Diagram: 

Vehicle Stability Control System Ref. To Wiring System>Vehicle Stability Control System .

Courtesy of SUBARU OF AMERICA, INC.

1. Check Ignition Switch  .

   Is The Ignition Switch On?

   Yes:  Go To  2.

   No:  Turn The Ignition Switch To On, And Select The [Steering Angle Sensor] Using The Subaru Select Monitor.

2. Check Battery  .
   1. Turn The Ignition Switch To Off.
   2. Measure The Battery Voltage.

   Is The Voltage 11 V Or More?

   Yes:  Go To  3.

   No:  Charge Or Replace The Battery. Ref. To Starting/Charging Systems (H4Do)>Battery .

3. Check Battery Terminal  .

   Is There Poor Contact At Battery Terminal?

   Yes:  Replace Or Tighten The Battery Terminal.

   No:  Go To  4.

4. Check Installation Of Steering Angle Sensor Connector  .

   Turn The Ignition Switch To Off.

   Is The Steering Angle Sensor Connector Inserted Into The Steering Angle Sensor Until The Clamp Locks?

   Yes:  Go To  5.

   No:  Insert The Steering Angle Sensor Connector Into The Steering Angle Sensor.

5. Check Lan System  .

   Check The Lan System. Ref. To Lan System (Diagnostics)>Basic Diagnostic Procedure .

   Is The Check Result Ok?

   Yes:  Go To  6.

   No:  Perform The Diagnosis For Lan System.

6. Check Subaru Select Monitor Communication  .
   1. Turn The Ignition Switch To On.
   2. Check Whether Communication To Steering Angle Sensor System Can Be Executed Normally.

   Is The [Select Function] Screen Displayed?

   Yes:  Check The Dtc Of The Steering Angle Sensor System. Ref. To steering Angle Sensor>Diagnostic Trouble Code (Dtc) .

   No:  Go To  7.

7. Check Subaru Select Monitor Communication  .

   Connect The Subaru Select Monitor To Another Vehicle To Check Whether The Communication For Initializing Can Be Executed Normally.

   Does The Subaru Select Monitor Communicate Normally?

   Yes:  Go To  8.

   No:  Repair Or Replace The Subaru Select Monitor.

8. Check Power Supply Circuit  .
   1. Turn The Ignition Switch To On. (Engine Off)
   2. Measure The Ignition Power Supply Voltage Between The Steering Angle Sensor Connector And Chassis Ground.

      Connector & Terminal 

      (I151) No. 4 (+) - Chassis Ground (-):

   Is The Voltage 10 - 15 V?

   Yes:  Go To  9.

   No:  Repair The Open Circuit Of Harness Between The Steering Angle Sensor And Battery.

9. Check Harness Connector Between Steering Angle Sensor And Chassis Ground  .
   1. Turn The Ignition Switch To Off.
   2. Disconnect The Connector From Steering Angle Sensor.
   3. Measure The Resistance Of Harness Between The Steering Angle Sensor Connector And Chassis Ground.

      Connector & Terminal 

      (I151) No. 1 - Chassis Ground:

   Is The Resistance Less Than 10 Ω?

   Yes:  Go To  10.

   No:  Repair The Open Circuit Of The Steering Angle Sensor Ground Circuit And Poor Contact Of Connector.

10. Check Poor Contact Of Connector  .

    Is There Poor Contact Of Steering Angle Sensor Power Supply, Ground Circuit And Data Link Connector?

    Yes:  Repair The Connector.

    No:  Replace The Steering Angle Sensor. Ref. To Vehicle Stability Control>Steering Angle Sensor .