Check SET/ACCEL Switch Operation
Turn ignition off. Disconnect speed control servo/actuator connector C146 (located near master cylinder). While pressing SET/ACCEL switch and rotating steering wheel from stop to stop, check resistance between speed control servo/actuator connector C146 terminals No. 5 and 6. See Figure . If resistance is 646-714 ohms, replace speed control servo/actuator and retest system operation. If resistance is not 646-714 ohms, replace speed control switch and retest system operation.