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: Procedure
- PERFORM CUSTOMER INTERVIEW
.
Ask the customer when and how the trouble occurred using the interview check list.
Did you interview the customer?
Yes: Go to 2.
No: Perform the interview, and Go to 2.
- PERFORM BASIC INSPECTION
.
Perform basic inspection. Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>GENERAL DESCRIPTION>INSPECTION>BASIC INSPECTION .
Is the check result OK?
Yes: Go to 3.
No: Repair the faulty part found in basic inspection, and Go to 3.
- CHECK SUBARU SELECT MONITOR COMMUNICATION
.
- Turn the ignition switch to OFF.
- Connect the Subaru Select Monitor to data link connector. Ref. to COMMON (DIAG)>DATA LINK CONNECTOR .
- Turn the ignition switch to ON and run the Subaru Select Monitor.
- Select [Airbag].NOTE:
For detailed operation procedures, refer to "Help" of application.
Is communication possible?
Yes: Go to 4.
No: Check the communication circuit. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE FOR SUBARU SELECT MONITOR COMMUNICATION .
- CHECK DTC
.
Read the DTC of [Airbag] using the Subaru Select Monitor. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .
Is DTC B1650 or B1655 displayed? (Current malfunction)
Yes: Record the DTC, and Go to 7.
No: Go to 5.
- CHECK SUBARU SELECT MONITOR COMMUNICATION
.
- Turn the ignition switch to OFF.
- Connect the Subaru Select Monitor to data link connector. Ref. to COMMON (DIAG)>DATA LINK CONNECTOR .
- Turn the ignition switch to ON and run the Subaru Select Monitor.
- Select [Occupant Detection].NOTE:
For detailed operation procedures, refer to "Help" of application.
Is communication possible?
Yes: Go to 6.
No: Check the communication circuit. Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE FOR SUBARU SELECT MONITOR COMMUNICATION .
- CHECK DTC
.
Read the DTC of [Occupant Detection] using the Subaru Select Monitor. Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .
Are any DTCs displayed? (Current malfunction)
Yes: Record the DTC, and Go to 7.
No: Currently, it is normal.
- PERFORM DIAGNOSIS
.
- Perform the diagnosis according to the displayed DTC. Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .
- Repair or replace the cause of trouble.
- Using the Subaru Select Monitor, perform the clear memory of [Airbag] or [Occupant Detection]. Ref. to COMMON (DIAG)>CLEAR MEMORY
.
- Airbag
- Occupant Detection
- Execute the inspection mode. Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>INSPECTION MODE .
- Using the Subaru Select Monitor, read the DTCs of [Airbag] or [Occupant Detection]. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)
. Ref. to OCCUPANT DETECTION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .
- Airbag
- Occupant Detection
Are any DTCs displayed? (Current malfunction)
Yes: Repeat step 7 until DTC is not shown.
No: Finish the diagnosis.
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.