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Home >> Subaru >> 2021 >> Ascent Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Anti-Theft System - Security And Locks >> Security System >> Inspection >> Basic Diagnostic Procedure

Basic Diagnostic Procedure

  1. CHECK DTC  .

    Read the DTC of body integrated unit using Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Is DTC displayed?

    Yes  : Perform the diagnosis for the displayed DTCs.

    No  : Go to  2.

  2. CHECK DATA MONITOR  .

    Display the following items using Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>DATA MONITOR .

    • [Driver's door SW input]
    • [P-door SW input]
    • [Rear right door SW input]
    • [Rear left door SW input]
    • [R Gate SW input]
    • [Hood Switch Close-side]

    Does the display switch between [OFF]←→[ON] when each door or the front hood is opened/closed?

    Yes  : Go to  3.

    No  : Check the following parts.

    • Door switches Ref. to SECURITY AND LOCKS>Door Lock Control System>INSPECTION>CHECK DOOR SWITCH .
    • Rear gate latch switch Ref. to SECURITY AND LOCKS>Rear Gate Latch and Actuator Assembly>INSPECTION .
    • Hood switch Ref. to SECURITY AND LOCKS>Security System>INSPECTION>CHECK HOOD SWITCH .
  3. CHECK SECURITY SYSTEM SETTINGS  .

    Check the settings of the security system [Security Alarm Setup] using the Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>DATA MONITOR .

    Is the setting of the security system [ON]?

    Yes  : Go to  5.

    No  : Go to  4.

  4. CHANGE SETTING OF SECURITY SYSTEM  .

    Change the setting of security system [Security Alarm Setup] 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  5.

    No  : Replace the body integrated unit. Ref. to SECURITY AND LOCKS>Body Integrated Unit>NOTE>REPLACE BODY INTEGRATED UNIT .

  5. CHECK KEYLESS SYSTEM OPERATION  .

    Check the operation of the keyless entry system or keyless access system.

    Does the keyless entry system or keyless access system operate normally?

    Yes  : Go to  6.

    No  : Check the keyless entry system or keyless access system.

    • Keyless entry system Ref. to SECURITY AND LOCKS>Keyless Entry System>INSPECTION .
    • Keyless access system Ref. to SECURITY AND LOCKS>Keyless Access With Push Button Start System>INSPECTION .
  6. CHECK SECURITY SYSTEM OPERATION  .
    1. Remove the key from ignition switch or turn the ignition switch to OFF, and close all doors and front hood.
    2. Check the status of security indicator light.
    3. Press the LOCK button of the keyless transmitter or access key.
    4. Check the security indicator light blinking patterns.

    Is the security indicator light blinking patterns as follows?

    • Before pressing the LOCK button: Blinks once every 3 seconds
    • After pressing the LOCK button:
    • When monitoring lag is set to 0 seconds, blinks twice within 0.5 seconds at 2 second intervals.
    • When monitoring lag is set to 30 seconds, blinks once every 0.4 seconds for 30 seconds, then blinks twice within 0.5 seconds at 2 second intervals.

    Yes  : Go to  7.

    No  : Check the security indicator light. Ref. to SECURITY AND LOCKS>Security System>INSPECTION>CHECK SECURITY INDICATOR LIGHT CIRCUIT .

  7. CHECK SECURITY ALARM OPERATION  .
    1. Check that the security indicator light blinks twice within 0.5 seconds at 2 second intervals.
    2. Operate the driver's door lock switch to the UNLOCK side.
    3. Open one of the doors.

    Does the security alarm operate, the horn sound and the hazard light blink?

    Yes  : Go to  8.

    No  : Check the following parts.

  8. CHECK DEACTIVATION OF SECURITY ALARM  .

    Press any 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  9.

    No  : Replace the body integrated unit. Ref. to SECURITY AND LOCKS>BODY INTEGRATED UNIT .

  9. CHECK MANUAL SETTING CHANGE OF SECURITY SYSTEM  .
    1. Press the UNLOCK button of the keyless transmitter or access key.
    2. 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 .
    • Push button ignition switch: Ref. to SECURITY AND LOCKS>Push Button Ignition Switch>INSPECTION .
    • Door lock switch circuit: Ref. to SECURITY AND LOCKS>Door Lock Control System>INSPECTION>CHECK DOOR LOCK SWITCH .
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