Cruise Control Is Not Released After Brake Pedal Has Been Depressed

Wiring diagram: 

Stop light system Ref. to WIRING SYSTEM>STOP LIGHT SYSTEM>WIRING DIAGRAM

Courtesy of SUBARU OF AMERICA, INC.

1. PERFORM REAL TIME DIAGNOSIS  .

   Check the input signal of cruise control system. Ref. to EYESIGHT (DIAGNOSTICS)>REAL-TIME DIAGNOSIS 

   Is the check result OK?

   Yes  : Currently, it is normal. Finish the diagnosis.

   No  : Go to  2.

2. CHECK STOP LIGHT & BRAKE SWITCH  .

   Check the stop light & brake switch. Ref. to BRAKE>STOP LIGHT SWITCH>INSPECTION

   Is the check result OK?

   Yes  : Go to  3.

   No  : Replace the stop light & brake switch. Or adjust the installation position.

3. CHECK STOP LIGHT & BRAKE SWITCH CIRCUIT  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the ground terminal from battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY
   3. Disconnect the connector from the stop light & brake switch.
   4. Using a tester, measure the resistance between the stop light & brake switch connector and chassis ground.

      Connector & terminal 

      (B101) No. 3 - Chassis ground:

   Is the resistance less than 10 Ω?

   Yes  : Go to  4.

   No  : Check the ground system circuit, and if any fault is found, repair the defective parts or replace the harness.

4. CHECK STOP LIGHT & BRAKE SWITCH CIRCUIT  .
   1. Connect the ground terminal to battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY
   2. Turn the ignition switch to ON.
   3. Using a tester, measure the voltage between the stop light & brake switch connector and chassis ground.

      Connector & terminal 

      (B101) No. 1 (+) - Chassis ground (-):

   Is the voltage 10 V or more?

   Yes  : Go to  5.

   No  :

   • Check the fuse No. 3 (main fuse box). Ref. to WIRING SYSTEM>STOP LIGHT SYSTEM>WIRING DIAGRAM
   • Check for open or short circuit in harness between the stop light & brake switch and the main fuse box.
5. CHECK STOP LIGHT & BRAKE SWITCH CIRCUIT  .

   Using a tester, measure the voltage between the stop light & brake switch connector and chassis ground.

   Connector & terminal 

   (B101) No. 5 (+) - Chassis ground (-):

   Is the voltage 10 V or more?

   Yes  : Go to  6.

   No  :

   • Check fuse No. 19 (fuse & relay box). Ref. to WIRING SYSTEM>STOP LIGHT SYSTEM>WIRING DIAGRAM
   • Check for open or short circuit in harness between the stop light & brake switch and the fuse & relay box.
6. CHECK STOP LIGHT & BRAKE SWITCH CIRCUIT  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the connector from ECM.
   3. Using a tester, measure the resistance between the ECM connector and stop light & brake switch connector.

      Connector & terminal 

      (B101) No. 2 - (B61) No. 39:

      (B101) No. 4 - (B61) No. 8:

   Is the resistance less than 10 Ω?

   Yes  : Go to  7.

   No  : Repair the harness.

7. CHECK STOP LIGHT & BRAKE SWITCH CIRCUIT  .
   1. Connect the stop light & brake switch connector.
   2. Turn the ignition switch to ON.
   3. Using a tester, measure the voltage between ECM connector and chassis ground both when the brake pedal is depressed and when not depressed.

      Connector & terminal 

      (B61) No. 8 (+) - Chassis ground (-):

      (B61) No. 39 (+) - Chassis ground (-):

   Does the voltage appear in (B61) No. 39 when the brake pedal is depressed? (0 V when the brake pedal is not depressed)

   Does the voltage appear in (B61) No. 8 when the brake pedal is not depressed? (0 V when the brake pedal is depressed)

   Yes  : Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>ENGINE CONTROL MODULE (ECM)

   No  : Replace the stop light & brake switch. Ref. to LIGHTING SYSTEM>STOP LIGHT SYSTEM