Main Switch Test

1. Turn ignition on. Check voltage between fuse No. 4 and ground. Voltage should be 10-13 volts.
2. Remove cruise control main switch and disconnect connector. With ignition on, measured voltage between harness connector terminal No. 3 and ground should be 10-13 volts. See Fig 1 .
   Fig 1: Testing Voltage At Main Switch Harness

   Courtesy of SUBARU OF AMERICA, INC.
3. To check function of main switch, measure resistance between terminals No. 3 and 5. Resistance should be less than 10 ohms with switch on and greater than one megohm with switch off. See Fig 2 .
4. To check harness between main switch and control module, reconnect harness connector. Turn ignition and main switches on. Measure voltage by backprobing between specified terminals and ground:
   • Terminals No. 3 and 5 of connector i10.
   • Terminal No. 4 of connector B54.

Voltages should be 10-13 volts. See Fig 3 .

Fig 2: Measuring Resistance In Main Switch

Courtesy of SUBARU OF AMERICA, INC.

Fig 3: Checking Harness Between Main Switch & Cruise Control Module

Courtesy of SUBARU OF AMERICA, INC.