"COAST" Circuit Test
Turn ignition on and connect voltmeter to Lt. Blue Black wire and ground. Depress "ON" switch in steering wheel and hold down on "COAST" button. Voltmeter should read about 6 volts. If all functions check good, perform Servo Test and Sensor Tests, and install a known good amplifier and recheck.
CAUTION:
Do not substitute a new amplifier until actuator coils have been tested as described in Servo Assembly Tests.