Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Basic Diagnostic Procedure
- INITIAL CHECK
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Check the keyless entry system or keyless access with push button start system.
Does the keyless entry system or keyless access with push button start system operate normally?
Yes: Go to 2.
No: Check the keyless entry system or keyless access with push button start system.
- Keyless entry system: Ref. to KEYLESS ENTRY (DIAGNOSTICS)>GENERAL DESCRIPTION>INSPECTION .
- Keyless access with push button start system: Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>GENERAL DESCRIPTION>INSPECTION .
- CHECK SECURITY ON/OFF SETTING
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- Remove the key from ignition switch or turn the ignition switch to OFF, and close all doors and front hood.
- Check the status of security indicator light.
- Press the LOCK button of the keyless transmitter or access key.
- Check the security indicator light blinking patterns.
Is the security indicator light blinking patterns as follows?
- Before pressing the LOCK button: Blinks once within 3 seconds
- After pressing the LOCK button: When monitoring lag is set to 0 second, blinks twice within 0.5 seconds in 2 second intervals. When monitoring lag is set to 30 seconds: Blinks once every 0.4 seconds continuously for 30 seconds, then blinks twice every 0.5 seconds at 2 seconds intervals.
Yes: Go to 4.
No: Go to 3.
- CHANGE SETTING OF SECURITY SYSTEM
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Change the setting of security system to ON using Subaru Select Monitor. Ref. to SECURITY AND LOCKS>SECURITY SYSTEM>INSPECTION>SECURITY SYSTEM ON/OFF SETTING .
Is setting change completed correctly?
Yes: Go to 4.
No: Check Subaru Select Monitor communication, and if there is no problem, replace the body integrated unit.
- Inspection: Ref. to BODY CONTROL (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE FOR SUBARU SELECT MONITOR COMMUNICATION .
- Replacement: Ref. to SECURITY AND LOCKS>BODY INTEGRATED UNIT .
- CHECK SECURITY SYSTEM OPERATION
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- Remove the key from ignition switch or turn the ignition switch to OFF, and close all doors and front hood.
- Press the LOCK button on the keyless transmitter or access key, then wait for 30 seconds.
- Check the security indicator light blinking patterns.
Does the security indicator light blink twice within 0.5 seconds in 2 second intervals?
Yes: Go to 5.
No: Check the security indicator light. Ref. to IMMOBILIZER (DIAGNOSTICS)>WARNING LIGHT ILLUMINATION PATTERN>INSPECTION .
- CHECK SECURITY ALARM OPERATION
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- Operate the driver's door lock switch to the UNLOCK side.
- Open any door, front hood, trunk lid or rear gate.
Does the security alarm operate when opening any door, front hood, trunk lid, or rear gate?
Yes: Go to 6.
No: Check the following parts. Ref. to SECURITY AND LOCKS>DOOR LOCK CONTROL SYSTEM>INSPECTION>SYMPTOM CHART .
- Door switches
- Trunk lid latch switch
- Rear gate latch switch
- Front hood latch switch
- CHECK SECURITY ALARM OPERATION
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Check the security alarm operation status.
During the operation, does the horn keep sounding and the hazard light blink?
Yes: Go to 7.
No: Check the following parts.
- Horn: Ref. to SECURITY AND LOCKS>SECURITY SYSTEM>INSPECTION>CHECK HORN .
- Hazard light: Ref. to SECURITY AND LOCKS>SECURITY SYSTEM>INSPECTION>CHECK HAZARD LIGHT OPERATION .
- CHECK SECURITY ALARM CANCEL OPERATION
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Press the LOCK button of the transmitter or access key while the security alarm is operating.
Do the horn sound and the blinking of the hazard light stop?
Yes: Go to 8.
No: Replace the body integrated unit. Ref. to SECURITY AND LOCKS>BODY INTEGRATED UNIT .
- CHECK SECURITY SYSTEM MANUAL ON/OFF SETTING
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- Press the UNLOCK button of the keyless transmitter or access key.
- Change the setting of security system. Ref. to SECURITY AND LOCKS>SECURITY SYSTEM>INSPECTION>SECURITY SYSTEM ON/OFF SETTING .
Is setting change completed correctly?
Yes: Restore the security system settings to those before the diagnosis and finish the diagnosis.
No: Check the following parts.
- Ignition switch circuit: Ref. to SECURITY AND LOCKS>IGNITION KEY LOCK>INSPECTION .
- Door lock switch circuit: Ref. to SECURITY AND LOCKS>DOOR LOCK CONTROL SYSTEM>INSPECTION>CHECK DOOR LOCK SWITCH .
If the horn sounds when the security is turned on (monitor condition) using the keyless transmitter or access key, check the function setting of the body integrated unit. As a cause, it is possible that the impact sensor present (ON)/not present (OFF) setting is set to ON in the customization function though there is no impact sensor. Ref. to BODY CONTROL (DIAGNOSTICS)>CUSTOMIZE .
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.