Diagnostic Procedure with Cancel Code: 12

Detected when the brake pedal is depressed, or the error related to the stop light & brake switch occurred.

TROUBLE SYMPTOM:

Cruise control cannot be set.
Cruise control cannot be released.

WIRING DIAGRAM:

Cruise control system <Ref. to WIRING DIAGRAM , Cruise Control System.>

Engine type: FA

Fig 1: Stop Light And Brake Switch - Wiring Diagram (Engine Type FA)
Courtesy of SUBARU OF AMERICA, INC.

Engine type: EJ

Fig 2: Stop Light And Brake Switch - Wiring Diagram (Engine Type EJ)

Courtesy of SUBARU OF AMERICA, INC.

Step	Check	Yes	No
1 CHECK STOP LIGHT & BRAKE SWITCH. Check the stop light & brake switch. <Ref. to Stop Light & Brake Switch .>	Are the check results for the stop light & brake switch unit, and installation position OK?	Go to step 2 .	Replace the stop light & brake switch. Or adjust the installation position.
2 CHECK STOP LIGHT & BRAKE SWITCH CIRCUIT. Turn the ignition switch to OFF. Disconnect the stop light & brake switch harness connector. Turn the ignition switch to ON. Measure the voltage between harness connector terminal and chassis ground. Connector & terminal (B65) No. 1 (+) - Chassis ground (-):	Is the voltage 10 V or more?	Go to step 3 .	Check the fuse No. 8 (fuse & relay box). Check for open or short circuit in harness between the stop light & brake switch and the fuse & relay box.
3 CHECK STOP LIGHT & BRAKE SWITCH CIRCUIT. Measure the voltage between harness connector terminal and chassis ground. Connector & terminal (B65) No. 3 (+) - Chassis ground (-):	Is the voltage 10 V or more?	Go to step 4 .	Check the fuse No. 4 (fuse & relay box). Check for open or short circuit in harness between the stop light & brake switch and the fuse & relay box.
4 CHECK STOP LIGHT & BRAKE SWITCH CIRCUIT. Turn the ignition switch to OFF. Disconnect the harness connector of ECM. Measure the resistance between ECM harness connector terminal and stop light & brake switch harness connector terminal. Connector & terminal Engine type: FA (B134) No. 43 - (B65) No. 4: (E158) No. 8 - (B65) No. 2: Engine type: EJ (B136) No. 3 - (B65) No. 2: (B136) No. 15 - (B65) No. 4:	Is the resistance less than 10 Ω?	Replace the ECM. <Ref. to Engine Control Module (ECM) .> <Ref. to Engine Control Module (ECM) .>	Repair the harness.