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Tailgate Window Defogger: Testing: Relay

  1. Attach negative lead of voltmeter to ground. Touch Red wire with voltmeter positive lead. Battery voltage should be indicated. If no voltage is indicated, operate tailgate window.
  2. If window operates, the wire between the relay and window switch is open. Touch Orange wire with voltmeter positive lead. No voltage should be indicated. Turn ignition switch "ON". Voltmeter should indicate voltage. If not, relay is defective or not receiving voltage from Purple wire.
  3. If relay operates properly, it should remain energized for 8 to 12 minutes before opening. If time period is too short or long, relay is defective. If relay did not energize, connect a jumper wire to a known good 12-volt source in tailgate and touch relay Purple terminal.
  4. If relay clicks, trace Purple wire for open or short. If relay does not click, check relay ground. If ground is satisfactory, replace relay.
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