Check Ignition Switch Circuit

CHECK CURRENT DATA .
Display the data of [BATT voltage] and «IG power supply voltage» using Subaru Select Monitor.

NOTE: For detailed procedures, refer to "PC application help for Subaru Select Monitor".

Does the «IG power supply voltage» indicate 0 V when the ignition is OFF, and fall within a range of ±1 V from the [BATT voltage] when the ignition is ON?

Yes: The ignition switch input circuit is OK.

No: Go to 2.
CHECK IGNITION SWITCH CIRCUIT .
1. Turn the ignition switch to OFF.
2. Disconnect the connector of body integrated unit.
3. Turn the ignition switch to ON.
4. Measure the voltage between the body integrated unit connector and chassis ground.
  Connector & terminal
  
  (B281) No. 3 (+) - Chassis ground (-):
Is the voltage 10 V or more?

Yes: Check body integrated unit. Ref. to BODY CONTROL SYSTEM (DIAGNOSTICS) > BASIC DIAGNOSTIC PROCEDURE .

No: Check the harness for open or short circuit between body integrated unit and fuse.