Coast Circuit Test
With ignition on, connect voltmeter between circuit No. 151 (Light Blue/Black wire) of amplifier connector and ground. Depress ON switch and hold COAST button. Voltmeter should read approximately 1.5 volts. If all functions check good, perform SERVO ASSEMBLY TEST and install a known good amplifier.
NOTE:
DO NOT substitute a new amplifier until actuator coils have been tested. See SERVO ASSEMBLY TEST section in this article.