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Check Cruise Control Command 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. (Cancelled immediately.)

WIRING DIAGRAM: 

Fig 1: Cruise Control Command Switch Wiring Diagram
G04991893Courtesy of SUBARU OF AMERICA, INC.
CRUISE CONTROL COMMAND SWITCH DIAGNOSTIC REFERENCE

Step Check Yes No
1 CHECK SET/COAST SWITCH CIRCUIT. 
  1. Turn ignition switch OFF.
  2. Disconnect cruise control module harness connector.
  3. Measure voltage between harness connector terminal and chassis ground when SET/ COAST switch is pressed and not pressed.

    Connector & terminal 

    (B94) No. 10 (+) - Chassis ground (-): 

 Is the measured value less than 0 V, when SET/COAST switch is not pressed? Is the measured value less than 10 V, when SET/COAST switch is not pressed? Go to step 2.  Go to step 4. 
2 CHECK RESUME/ACCEL SWITCH CIRCUIT. 
Measure voltage between harness connector terminal and chassis ground when RESUME/ ACCEL switch is pressed and not pressed.
Connector & terminal 
(B94) No. 9 (+) - Chassis ground (-): 		 Is the measured value less than 0 V, when RESUME/ ACCEL switch is not pressed? Is the measured value less than 10 V, when RESUME/ ACCEL switch is not pressed? Go to step 3.  Go to step 4. 
3 CHECK CANCEL SWITCH CIRCUIT. 
Measure voltage between harness connector terminal and chassis ground when CANCEL switch is pressed and not pressed.
Connector & terminal 
(B94) No. 9 (+) - Chassis ground (-): 
(B94) No. 10 (+) - Chassis ground (-): 		 Is the measured value less than 0 V, when CANCEL switch is not pressed? Is the measured value less than 10 V, when CANCEL switch is not pressed? Cruise control command switch circuit is OK. Go to step 4. 
4 CHECK POWER SUPPLY FOR COMMAND SWITCH. 
Check horn operation.		 Does horn sound? Go to step 5. 
  • Check fuse No. 6 (in main fuse box).
  • Check horn relay. < Ref. to HORN RELAY , INSPECTION, HORN SYSTEM. >
  • Check harness for open or short between cruise control command switch and fuse & relay box.
5 CHECK CRUISE CONTROL COMMAND SWITCH. 
Remove and check cruise control command switch. < Ref. to CRUISE CONTROL COMMAND SWITCH . >		 Is cruise control command switch OK? Check harness between cruise control command switch and cruise control module. Replace cruise control command switch.
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