Audi Air conditioning 2003 A8 Workshop Manual page 67

Example:
2
500 W/m (sunlight penetration) x 0.21 m
0.13 (efficiency of solar cells -C20- ) x 0.9 (efficiency of fresh air
blower control unit -J126- )
5.19.1 Checking operation of solar roof
– Move the vehicle into the sun.
Note
If the weather conditions are not suitable, shine two commer‐
♦
cially available 1000 W halogen lamps for example onto the
solar roof, maintaining a distance of at least 500 mm from the
solar roof. To enable the solar cells -C20- to supply sufficient
electrical energy to drive the fresh air blower -V2- , it must be
ensured that all sun roof solar cells -C20- are evenly and fully
illuminated.
The electrical energy supplied is only approx. 1.5 W on shining
♦
halogen lamps onto the solar roof ( fresh air blower -V2- ro‐
tates but air flow is hardly perceptible).
Depending on the version, the measured value block of the
♦
front operating and display unit, Climatronic control unit -J255-
indicates the power currently being supplied by the solar cells
-C20- (voltage and current) immediately after switching off the
ignition ⇒ "Guided fault-finding" function of vehicle diagnostic,
testing and information system VAS 5051.
– Open the „centre" dash panel vents and close all other vents.
– Check the setting at the front operating and display unit, Cli‐
matronic control unit -J255- or MMI (Multi Media Interface); the
„Solar mode" function must have been set.
– Close the sun roof.
– Switch off the ignition (front operating and display unit blank).
A current of air can be felt from the dash panel vents (moisten
palm of hand to check if necessary).
If no current of air can be felt:
– Interrogate the fault memory of the front operating and display
unit, Climatronic control unit -J255- and check the encoding of
the front operating and display unit ⇒ "Guided fault-finding"
function of vehicle diagnostic, testing and information system
VAS 5051.
– Check the setting (and if necessary the adaption) at the front
operating and display unit, Climatronic control unit -J255- and
at the MMI (the „Solar mode" function must have been activa‐
ted) ⇒ "Guided fault-finding" function of vehicle diagnostic,
testing and information system VAS 5051 .
– Switch off ignition.
– Remove the intake housing with air flow flap
2
(sun roof solar area) x
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permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
5. Components for control and regulation of air conditioner not located in passenger compartment
Air conditioning - Edition 09.2010
⇒ page 42 .
Audi A8 2003 ➤
61