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Check Ignition Switch Circuit

SYMPTOM CHART

Step Check Yes No
1 CHECK IGNITION SWITCH VOLTAGE. 
  1. Prepare the Subaru Select Monitor kit.
  2. Turn the ignition switch to ON (engine OFF) and run the "PC application for Subaru Select Monitor".
  3. On « System Selection Menu» display, select {Integ. unit mode}.
  4. Select the {Current Data Display & Save}.
  5. Select the {BATT voltage} and {IG power supply}.
 Does the {IG power supply voltage} indicates 0 V when ignition is OFF or a value in a range of ±1 V from the {BATT voltage} when ignition is ON. The ignition switch input circuit is OK. Go to step 2  .
2 CHECK IGNITION SWITCH CIRCUIT. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the harness connector of body integrated unit.
  3. Turn the ignition switch to ON.
  4. Measure the voltage between harness connector terminal and chassis ground.

    Connector & terminal 

    (i171) No. 17 (+) - Chassis ground (-): 

 Is the voltage 10 V or more? Check body integrated unit. Ref. to BASIC DIAGNOSTIC PROCEDURE . Check the harness for open or short circuit between body integrated unit and fuse.
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