Audi A4

since 1994 release

Repair and operation of the car

The warmed back glass

Naked right rack of a roof


1 – connection of the antenna; 2 – connection of the back warmed glass; 3 – an antenna wire to the radio receiver;	4 – a pilot line from the radio receiver; 5 – amplifier of the antenna; 6 – a wire from the switch of the warmed glass.

The point of the weight (shooter) of the warmed back glass and the antenna is in back glass on the right back rack of a roof. It is available after dismantle of facing of a rack of a roof.

Heating of back glass joins and switched off directly by means of the switch on a control panel. Current at the included ignition arrives to the switch from the relay of unloading of H-contact through a safety lock in a white/yellow wire. The electronic scheme of inclusion with the timer which is integrated into the switch of the warmed back glass, disconnects giving of current to glass approximately in 10 min.

Search of malfunctions

If the warmed back glass remains cold, the following opportunities are considered:

PERFORMANCE ORDER

Defective safety lock.
Defective switch. Dismantle (as it is described in this chapter) and check an electric control lamp, whether there is tension in a white wire at the included ignition and the pressed switch.
Dismantle both coverings of a rack of a roof near back glass. It is easier to make it after dismantle of a reception pocket in back part of the car and lateral facing of a seat.
Check the bringing wire to back glass: by means of a control lamp establish, whether there is tension behind in the white giving wire at the left on glass. (It also belongs to cars with the antenna in back glass.)
On the right rack of a roof check, whether as it should be contact of glass with weight.
The damaged threads of heating can be repaired a conducting silver varnish which is on sale in shops of the accompanying goods.

Council: Three conducting paths above on the warmed back glass belong to the antenna and therefore do not heat up.