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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5
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REAR WINDOW DEFOGGER INSPECTION

1. Switch the ignition ON (engine off).
2. Turn the rear window defogger switch on.

CAUTION:

  • Directly touching the rear window defogger with the lead of the tester could damage it. Wrap aluminum foil around the end of the lead and inspect the rear window defogger by touching it with the aluminum foil.

3. Connect the positive lead of the tester to the positive side of each rear window defogger and the negative lead to ground.
4. Gradually slide the positive lead from the positive side to the negative side and verify that the voltage decreases accordingly.

  • If the voltage changes rapidly, the rear window defogger has a malfunction. Repair the rear window defogger. (See REAR WINDOW DEFOGGER REPAIR.)

Measured part

Voltage (Reference)

(1) to (2)

Approx. 11 V to 0 V
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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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