Table of contents: Troubleshooting Rear Window Antenna ↓ Speakers in the door trim ↓ Removal the rear speakers ↓
The main advantage: it does not disturb others. In addition, it is not damaged when washing the car. With this type of antenna, the antenna for receiving CB is two metal conductors at the very top of the glass. The remaining conductors, which also act as wire heating elements, serve for receiving VHF (FM). The antenna amplifier, located under the trim of the left rear pillar, compensates for the insufficient height of this antenna system.
Left: The ground point (arrow) for the rear window heating and rear window antenna is located on the right rear pillar. The pillar is shown with the trim removed.
Right: Hidden behind the left trim of the rear pillar are:
1 - connecting the antenna for receiving MW;
3 - antenna amplifier;
2 - general connection of rear window heating and VHF antenna;
4 - radio control circuit wire;
5 - connecting wire from the heated rear window switch.
Troubleshooting Rear Window Antenna
Remove the rear seat backrest (chapter "Salon"), rear speakers, rear panel, and then remove the trim of both rear pillars.
Check the ground connection of the rear window heating at the right pillar; then check the connection to the ground (housing) of the antenna amplifier using its mounting bolt.
Carefully check the conductors on the rear window: can a visible break be found? If so, repair with conductive silver varnish (see Fig. "Rear window heating") or replace this glass with a new one.
Now it's time to do some electrical testing; disconnect the plugs on top of the amplifier, measure the voltage on the "ground". To do this, turn on the radio.
Voltage present: The amplifier power supply is OK. Voltage absent: Repair the open circuit.
In the same wire, measure the current between the amplifier connection and the removed wire.
The ammeter should show 30-50 mA, otherwise the antenna amplifier is not receiving power and, accordingly, is faulty - replace it.
Next: disconnect the lower wire of the rear window heating, turn on the ignition and rear window heating, measure the voltage in the wire:
The wire must be under battery voltage, otherwise the wires or amplifier are faulty. Narrow down the search for the fault:
Disconnect the lower wire from the amplifier, measure the voltage with the ignition and rear window heating on:
If the device shows the battery voltage, then the wires are OK, i.e. the amplifier is faulty. Otherwise, it's the other way around.
Speakers in the door trim
If the speakers were installed at the factory, they are located in the front door trim.
Remove the door trim.
Midrange speakers: Disconnect the speaker at the bottom of the trim.
Loosen the three speaker mounting screws and disconnect the wire.
High frequency speakers: unscrew the Phillips-head screws on the back of the speaker, disconnect the wire.
Removal the rear speakers
In the Audi 100, there are speakers on the upper right and left side of the rear panel.
On the luggage compartment side, loosen the three Phillips head screws under the panel.
Remove the speakers from the panel into the passenger compartment and disconnect the wires.
(This article was copied from the website: AudiManual.ru)