LEMON Manuals: Even more car manuals for everyone
Home >> Subaru >> 2021 >> Crosstrek Hybrid >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Brake Control System (Diagnostics) (Except HEV)) >> Diagnostic Procedure With Diagnostic Trouble Code (DTC) >> DTC C1531: BLS Off Stuck >> Model Without Eyesight (IMPREZA Model) • Mt Model (CROSSTREK Model)

Model Without Eyesight (IMPREZA Model) • Mt Model (CROSSTREK Model)

WARNING: This page is about a different variant/trim than selected.

DTC detecting condition: 

A fault is detected if stop light switch signal is OFF for a predetermined time or more with the pressure signal of the pressure sensor high.

Trouble symptom: 

Wiring diagram: 

Vehicle dynamics control system Ref. to WIRING SYSTEM (IMPREZA MODEL)>VEHICLE DYNAMICS CONTROL SYSTEM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>VEHICLE DYNAMICS CONTROL SYSTEM .

G11257696Courtesy of SUBARU OF AMERICA, INC.
CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to BRAKE CONTROL (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .
  1. CHECK INSTALLATION POSITION OF STOP LIGHT SWITCH  .

    Check the installation position of the stop light switch. Ref. to BRAKE>STOP LIGHT SWITCH>INSPECTION>INSPECT THE SPECIFIED POSITION .

    Is the check result OK?

    Yes:  Go to  2.

    No:  Adjust the installation position of the stop light switch. Ref. to BRAKE>STOP LIGHT SWITCH>INSTALLATION .

  2. CHECK STOP LIGHT SWITCH UNIT  .

    Perform the inspection of stop light switch unit. Ref. to BRAKE>STOP LIGHT SWITCH>INSPECTION>CHECK OUTPUT .

    Is the check result OK?

    Yes:  Go to  3.

    No:  Replace the stop light switch. Ref. to BRAKE>STOP LIGHT SWITCH .

  3. CHECK STOP LIGHT POWER SUPPLY  .

    Measure the voltage between stop light switch terminal and chassis ground.

    Connector and terminal 

    (B65) No. 1 (+) - Chassis ground (-):

    Is the voltage 10 - 15 V?

    Yes:  Go to  4.

    No:  Repair the stop light power supply circuit.

  4. CHECK STOP LIGHT SWITCH HARNESS  .
    1. Disconnect the connector from the VDCCM and H/U.
    2. Measure the resistance between VDCCM and H/U and stop light switch.

      Connector and terminal 

      (B65) No. 2 - (B310) No. 2:

    Is the resistance less than 1 Ω?

    Yes:  Go to  5.

    No:  Repair the stop light switch circuit.

  5. CHECK POOR CONTACT OF CONNECTORS  .

    Is there poor contact of connector between stop light switch and VDCCM and H/U?

    Yes:  Repair the connector.

    No:  Go to  6.

  6. CHECK VDCCM AND H/U  .
    1. Connect all connectors.
    2. Using the Subaru Select Monitor, perform the clear memory of [Brake Control]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
    3. Execute the inspection mode. Ref. to BRAKE CONTROL (DIAGNOSTICS)>INSPECTION MODE .
    4. Read the DTC of [Brake Control] using the Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Is the same DTC displayed?

    Yes:  Replace the VDCCM and H/U. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM AND H/U) .

    No:  Go to  7.

  7. CHECK DETECTION OF OTHER DTCS FOR VDC  .

    Read the DTC of [Brake Control] using the Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Is any other DTC displayed?

    Yes:  Perform the diagnosis according to the DTC. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

    No:  Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

scientia non olet · About LEMON Manuals