Check Stop Light Switch And Brake Switch

WARNING: This page is about a different car, the 2006 Subaru Baja. However, it is still accessible from the selected car via links, so may be relevant.

TROUBLE SYMPTOM:

Cruise control cannot be set.

WIRING DIAGRAM:

Fig 1: Stop Light Switch And Brake Switch Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

STOP LIGHT SWITCH AND BRAKE SWITCH DIAGNOSTIC REFERENCE

Step	Check	Yes	No
1 CHECK STOP LIGHT SWITCH AND BRAKE SWITCH CIRCUIT. Turn ignition switch OFF. Disconnect stop light switch and brake switch harness connector. Turn ignition switch ON. 4) Turn cruise control main switch ON. Measure voltage between harness connector terminal and chassis ground. Connector & terminal (B65) No. 2 (+) - Chassis ground (-):	Is the measured value less than 10 V?	Go to step 2.	Check fuse No. 16 (in fuse & relay box). Check harness for open or short between stop light/ brake switch and fuse & relay box.
2 CHECK STOP LIGHT SWITCH AND BRAKE SWITCH CIRCUIT. Measure voltage between harness connector terminal and chassis ground. Connector & terminal (B65) No. 1 (+) - Chassis ground (-):	Is the measured value less than 10 V?	Go to step 3.	Check harness for open or short between stop light/ brake switch and cruise control module (AT). Check clutch switch and the circuit (MT).
3 CHECK STOP LIGHT SWITCH AND BRAKE SWITCH CIRCUIT. Turn cruise control main switch and ignition switch OFF. Disconnect cruise control module harness connector. Measure resistance between cruise control module harness connector terminal and stop light switch and brake switch harness connector terminal. Connector & terminal (B94) No. 20 - (B65) No. 3: (B94) No. 16 - (B65) No. 4:	Is the measured value less than 10 Ω?	Go to step 4.	Repair harness.
4 CHECK STOP LIGHT SWITCH AND BRAKE SWITCH. Remove and check stop light switch and brake switch. < Ref. to STOP AND BRAKE SWITCH . >	Are stop light switch and brake switch OK?	Stop light switch and brake switch circuit are OK.	Replace stop light switch and brake switch.