Audi 1999 TT, Repair Manual, Page: 31 / 199

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
with respect to the correctness of information in this document. Copyright by AUDI AG.
1.3 A/C System Control and Regulation
Components Inside Passenger Com‐
partment
Note
♦
If there is a malfunction in the system, first check the Clima‐
tronic control module -J255- DTC memory. Refer to Vehicle
diagnosis, testing and information system -VAS5051B- in the
"Guided Fault Finding" function.
♦
If no fault is displayed, read the measured value block for the
Climatronic control module -J255- and activate the component
with the “output diagnosis test mode“ function on the Vehicle
diagnosis, testing and information system -VAS5051B- in the
"Guided Fault Finding" function.
♦
The electrical test for various actuators, potentiometers and
sensors is described in Guided Fault Finding using Vehicle
diagnosis, testing and information system -VAS5051B- in the
"Guided Fault Finding" function.
♦
Servicing operations on refrigerant circuit are described in
⇒ “1.19 Refrigerant Circuit, Servicing“, page 38 .
♦ Perform the following work after completion of repair opera‐
tions:
– Check Climatronic control module -J255- DTC memory and
erase any possible displayed malfunctions using Vehicle di‐
agnosis, testing and information system -VAS5051B- in the
"Guided Fault Finding" function.
– Check coding of Climatronic control module using Vehicle di‐
agnosis, testing and information system -VAS5051B- in the
"Guided Fault Finding" function.
– If necessary, check adaptation of the Climatronic control mod‐
ule using Vehicle diagnosis, testing and information system -
VAS5051B- in the "Guided Fault Finding" function.
– Perform A/C system basic setting using Vehicle diagnosis,
testing and information system -VAS5051B- in the "Guided
Fault Finding" function.
♦ Left side components, refer to
⇒ “2.8 A/C Components Inside Passenger Compartment, Left
Side“, page 59 .
♦ Right side components, refer to
⇒ “2.9 A/C Components Inside Passenger Compartment,
Right Side“, page 61 .
Audi TT 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 01.2011
1. General Information
27