Heated Windscreen; Operation Of Heated Windscreen - Audi Air conditioning 2003 A8 Workshop Manual

6

Heated windscreen

6.1

Operation of heated windscreen

♦ The heated windscreen control unit -J505- -A- is installed in
the luggage compartment on the left beneath the battery -A-
(vehicle battery).
♦ The heated windscreen control unit -J505- -A- is actuated by
the front operating and display unit, Climatronic control unit -
J255- ⇒ "Guided fault-finding" function of vehicle diagnostic,
testing and information system VAS 5051 (Reading measured
value block).
– After starting a cold engine if the ambient temperature is less
than + 5° C and the front operating and display unit, Clima‐
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability tronic control unit -J255- is set to „Auto" mode. The tempera‐
with respect to the correctness of information in this document. Copyright by AUDI AG.
ture setting on the front operating and display unit, Climatronic
control unit -J255- must be such that the air conditioner is in
heating mode and the temperature measured by the senders
( left vent temperature sender -G150- , right vent temperature
sender -G151- ) must not be in excess of +35 °C. The heating
period is governed by the ambient temperature (max. 6 mi‐
nutes at -40°).
– On selecting „Defrost" mode on the front operating and display
unit, Climatronic control unit -J255- if the ambient temperature
is less than + 5° C. The heating period is between 2 and 6
minutes depending on the ambient temperature. The lamp in
the button flashes as long as the heated windscreen
Defrost
is switched on. Actuation only takes place with the engine run‐
ning.
♦ The heated windscreen control unit -J505- -A- switches on the
heated windscreen if the following conditions are fulfilled:
– Front operating and display unit, Climatronic control unit -
J255- actuating heated windscreen control unit -J505-
– Voltage at heated windscreen control unit -J505- greater than
12.70 V
– Heated windscreen control unit -J505- not overheated
Audi A8 2003 ➤
Air conditioning - Edition 09.2010
6. Heated windscreen
63