Introduced in 1966 by Volvo, the rear-window defogger melts snow and ice so you can see out the back window of your vehicle. Increasingly popular, it’s now included on most cars, like the VW Passat. You can identify and repair most problems with the rear-window defogger in a Passat in less than 1/2 hour.
Tools Used: Tools, Voltmeter, Defogger repair kit
Service a Rear-Window Defogger
Locate the fuse box within the front cabin under the steering wheel. Remove the defogger fuse from the slot labeled S226. It should be a 30-amp fuse. Pull it out, and hold the fuse up to the light to check whether the metal plate inside is broken or blown. If it is, then replace the fuse. Check both sides of the slot in the fuse box with a voltmeter to make sure both sides register.
Examine the tabs holding the wires to the rear-window defogger in the Passat. If either side has disconnected from the black grid, pull the tab back from the window.