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Defogger Test (Canada)

  1. Connect the YEL/BLK with the YEL terminal of the switch and the YEL terminal of the relay with the BLK terminal by jumper wires. See Figure . There should be battery voltage when the ignition switch is turned ON. If there is voltage, go to step  2 . If there is no voltage, check for a break in the YEL wire, poor ground.
  2. Connect the WHT/BLU and on terminal of the relay with a jumper wire and check for voltage between the WHT/BLU terminal and body ground. There should be battery voltage and both mirrors should warm up with the ignition and defogger switch turned on. If there is no voltage or neither warms up, check for:
    • Blown fuse No. 37 (15 A) in the underhood fuse/relay box. A break in the WHT/YEL and ORN wires. For poor ground.
    • If only one fails to warm up, check its defogger.
    • If both fail to warm up, check the defogger switch and defogger relay.
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