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Power Circuit

  1. Turn ignition off. Access time control unit with harness still connected. Using an ohmmeter, check continuity between terminal No. 15 and ground. Continuity should exist. If not, inspect TCU harness circuit and repair or replace as needed.
  2. Connect a voltmeter between terminals No. 9 (+) and 15 (-) at harness side of connector. Voltmeter should show 12 volts when ignition switch is in any position.
  3. Connect voltmeter to terminals No. 5 (+) and 15 (-). With ignition switch in the OFF or ACC position, voltmeter should show zero volts. With ignition switch in the ON position, voltmeter should show 12 volts. If results are incorrect, inspect TCU harness circuit. If correct, test TCU output wiper relay circuit.
  4. Connect voltmeter leads to terminals No. 2 (+) and 15 (-). With ignition switch in the ACC or ON position, voltmeter should read 12 volts. There should be no voltage reading when ignition switch is in the OFF position. If results are incorrect, inspect TCU harness circuit. If correct, test TCU output wiper relay circuit.
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