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Cruise Control Systems: Testing: Amplifier

CAUTION: DO NOT use a test light to perform amplifier tests because too much current draw will damage electronic components. Use only a voltmeter of 5000 ohm/volt rating or higher.
  1. Make the following tests at the amplifier 6-way connector. Turn ignition on and connect voltmeter between White-Purple stripe wire and ground in connector. Battery voltage should be present.
  2. Connect voltmeter to Lt. Blue-Black wire and ground. With "ON" switch in steering wheel depressed, battery voltage should be present. If not, perform control switch test.
  3. Release "ON" button. Voltmeter should read 7.8 volts. If not, check system ground, wiring, fuse and circuit breaker. Install a known good amplifier and recheck, if necessary.
  4. Depress "OFF" switch. Voltage should drop to zero. If not, perform control switch test. Install a known good amplifier and recheck, if necessary.
  5. Depress and hold "SET-ACC" switch. Voltmeter should read 4.5 volts. Rotate steering wheel several times. If voltage varies more than 0.5 volts, perform control switch test.
  6. Depress and hold "COAST" button. Voltage should be 1.5 volts. Depress and hold "RESUME" button. Voltage should be 6.5 volts. If all readings are correct, test servo assembly.
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