Checking the rear window defroster (Audi A8 D2)

The rear window defroster is a plurality of horizontal conductors sprayed onto the inner surface of the rear window.

To detect a break in the rear window defroster wire, turn on the ignition and the rear window defroster switch.

To detect a break in the rear window defroster wire, turn on the ignition and the rear window…

Fig. 18–68 Using a foil-wrapped voltmeter lead to detect a break in the rear window defroster wire

Connect one terminal of the voltmeter to the vehicle ground, wrap the other terminal with foil and move it along the heater conductor (Fig. 18–68).

Fig. 18–69 Using a voltmeter to locate a broken rear window defroster wire

Connect the voltmeter lead to the center of each rear window defroster wire. If the voltmeter shows about 5 V, the defroster wire is OK. If the voltmeter shows 0 or 12 V, the defroster wire is broken (Fig. 18–69).

Fig. 18–70. Using a voltmeter to locate a break in the rear window defroster wire

To locate a break in the heater wire, connect one lead of the voltmeter to the positive terminal of the heater and move the other lead along the heater wire from the negative terminal of the heater. The point at which the voltage indicated by the voltmeter drops to zero is the break in the heater wire (Fig. 18–70).

The article is a reprint of material from AUDImanual.ru

The article was checked by auto expert Nikita Rudakov

This article is available at russian, bulgarian, belarusian, ukrainian, serbian, croatian, romanian, polish, slovak, hungarian