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Wiper & Washer Activate Individually But Not In Combination

  1. Leave TCU connector connected. Turn ignition switch to ACC position. Measure voltage between TCU connector terminals No. 13 and 15. See Figure . With washer switch in OFF position, about 12 volts should be present. With washer switch in ON position, no voltage should be present. If voltages are not as specified, repair wiring harness between TCU and wiper switch.
  2. If voltages are as specified, measure voltage between TCU connector terminals No. 1 and 15 after operating washer switch. Voltmeter should indicate zero volts for about 3 seconds after washer has operated. If voltage is as specified, replace wiper amplifier. If voltage is not as specified, replace TCU.
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