Model With Eyesight (IMPREZA Model) • CVT 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:

VDC does not operate.
Hill start assist does not operate.
EyeSight does not operate. (Models with EyeSight)

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 .

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to BRAKE CONTROL (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .

CHECK INSTALLATION POSITION OF STOP LIGHT SWITCH .
1. 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 .
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 .
CHECK STOP LIGHT RELAY .
Measure the resistance of stop light relay terminals.

Terminals

No. 6 - No. 9:

Is the resistance less than 1 Ω?

Yes: Go to 4.

No: Replace the stop light relay. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>RELAY AND FUSE .
CHECK VDCCM AND H/U CONNECTOR .
Disconnect the connector from the VDCCM and H/U.

Is there poor contact or damage of the VDCCM and H/U connector?

Yes: Repair the VDCCM and H/U connector.

No: Go to 5.
CHECK STOP LIGHT SWITCH CIRCUIT (CHECK FOR OPEN CIRCUIT) .
Measure the resistance of stop light switch circuit.

Connector and terminal

(B310) No. 2 - (B225) No. 9:

(B65) No. 2 - (B225) No. 6:

(B65) No. 1 - (F/B fuse) No. 37:

Is the resistance less than 1 Ω?

Yes: Go to 6.

No: Repair the stop light switch circuit.
CHECK STOP LIGHT SWITCH CIRCUIT .
1. Connect all connectors.
2. Turn the ignition switch to ON.
3. Measure the voltage between brake light relay and chassis ground.
  Connector and terminal
  
  (B225) No. 9 (+) - Chassis ground (-):
Is the voltage 10 V or more when the stop light switch is ON (when pedal is depressed)?

Yes: Go to 7.

No: Repair the stop light switch circuit.
CHECK VDCCM AND H/U .
1. Using the Subaru Select Monitor, perform the clear memory of [Brake Control]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
2. Execute the inspection mode. Ref. to BRAKE CONTROL (DIAGNOSTICS)>INSPECTION MODE .
3. 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 8.
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.