Check Cruise Control Main 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 main switch is not turned ON and cruise control cannot be set.

NOTE: When the main relay (built-in cruise control module) operates, the main switch circuit is in normal condition. The main relay operation can be checked by hearing the operation sounds.

This operation sounds will be heard when ignition switch and cruise control main switch is turned to ON.

WIRING DIAGRAM:

Fig 1: Cruise Control Main Switch Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

CRUISE CONTROL MAIN SWITCH DIAGNOSTIC REFERENCE

Step	Check	Yes	No
1 CHECK CRUISE CONTROL MAIN SWITCH CIRCUIT. Turn ignition switch OFF. Disconnect cruise control main switch harness connector. Turn ignition switch ON. Measure voltage between harness connector terminal and chassis ground. Connector & terminal (I19) No. 3 (+) - Chassis ground (-):	Is the measured value less than 10 V?	Go to step 2.	Check fuse No. 18 (in fuse & relay box). Check harness for open or short between cruise control main switch and fuse & relay box.
2 CHECK CRUISE CONTROL MAIN SWITCH CIRCUIT. Turn ignition switch OFF. Disconnect cruise control module harness connector. Measure resistance between cruise control module harness connector terminal and cruise control main switch harness connector terminal. Connector & terminal (B94) No. 15 - (i19) No. 5: (B94) No. 1 - (i19) No. 6: (B94) No. 11- (i19) No. 1:	Is the measured value less than 10 Ω?	Go to step 3.	Repair harness.
3 CHECK CRUISE CONTROL MAIN SWITCH. Remove and check cruise control main switch. < Ref. to CRUISE CONTROL MAIN SWITCH . >	Is cruise control main switch OK?	Replace cruise control module.	Replace cruise control main switch.