EXCEPT FOR NON-TURBO MODEL (WITHOUT EyeSight AND X MODE): Wiring Diagram

Stop light system Ref. to WIRING SYSTEM>Stop Light System>WIRING DIAGRAM>EXCEPT FOR MODEL WITHOUT EyeSight AND X MODE .

Fig 1: Turbo Model Stop Light System Wiring Diagram (BLS OFF Stuck)

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK STOP LIGHT SWITCH. 
   1. Check the stop light switch. Ref. to BRAKE>Stop Light Switch>INSTALLATION .

   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. 
   1. Disconnect the stop light switch connector.
   2. Measure the resistance of stop light switch terminals.

      Terminals 

      No. 1 -No. 2:

   Is the resistance less than 1 Ω when the stop light switch is ON (when pedal is depressed)?

   • Yes  : Go to 3. 
   • No  : Replace the stop light switch. Ref. to BRAKE>Stop Light Switch .
3. CHECK STOP LIGHT RELAY. 

   Measure the resistance of stop light relay terminals.

   Terminals 

   No. 15 -No. 18:

   Is the resistance less than 1 Ω?

   • Yes  : Go to 4. 
   • No  : Replace the stop light relay.
4. CHECK VDCCM&H/U CONNECTOR. 

   Disconnect the connector from the VDCCM&H/U.

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

   • Yes  : Repair the VDCCM&H/U connector.
   • No  : Go to 5. 
5. CHECK STOP LIGHT SWITCH CIRCUIT (CHECK FOR OPEN CIRCUIT). 

   Measure the resistance of stop light switch circuit.

   Connector & terminal 

   (B310) No. 6 - (B564) No. 18:

   (B65) No. 2 - (B564) No. 15:

   (B65) No. 1 - (F/B fuse) No. 8:

   Is the resistance less than 1 Ω?

   • Yes  : Go to 6. 
   • No  : Repair the stop light switch circuit.
6. 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 & terminal 

      (B564) No. 18 (+) - 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.
7. CHECK VDCCM&H/U. 
   1. Clear the memory. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Clear memory .
   2. Perform the Inspection Mode. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode .
   3. Read the DTC. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Read Diagnostic Trouble Code (DTC) .

   Is the same DTC displayed?

   • Yes  : Replace the VDCCM only. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>REPLACEMENT .
   • No  : Go to 8. 
8. CHECK DETECTION OF OTHER DTCS FOR VDC. 

   Ref. to BRAKE CONTROL (DIAGNOSTICS)>Read Diagnostic Trouble Code (DTC) .

   Is any other DTC displayed?

   • Yes  : Perform the diagnosis according to DTC. Ref. to BRAKE CONTROL (DIAGNOSTICS)>List of Diagnostic Trouble Code (DTC) .
   • No  : Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.