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Rear Window Defogger Relay

NOTE: Rear window defogger relay may also be referred to as rear defogger relay or defogger relay.
  1. Ensure ignition is off. Remove rear window defogger relay. Rear window defogger relay is located in instrument panel junction block and is marked as DEF relay. See Figure.
  2. Note identification of electrical terminals on rear window defogger relay. See Fig 1. Using ohmmeter, check that no continuity exists between terminals No. 3 and 5 on rear window defogger relay. Check that continuity exists between terminals No. 1 and 2 on rear window defogger relay.
  3. Using jumper wires, apply battery voltage and ground to terminals No. 1 and 2 on rear window defogger relay. Check that continuity now exists between terminals No. 3 and 5 on rear window defogger relay. See Fig 1. Replace rear window defogger relay if defective.
    Fig 1: Identifying Electrical Terminals On Rear Window Defogger Relay Or Taillight Relay
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