Control module identification (e.g. display field - 2 -)

WARNING: This page is about a different car, the 2008 Audi S4, 2008 Audi RS 4, and 2008 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Locating Control Module Identification With Code Indicated On The Display

Courtesy of VOLKSWAGEN UNITED STATES, INC.

08 - AC heating electronics	Selected vehicle system
8E0 820 043 X	Part No.; allocation
A4 Automatic AC	Audi A4 A/C control module
XXXX	Data version (hardware and software) of control module
Code XXXXX:	Applies to vehicle-specific optional extras → Climatronic Control Module J255, coding (function 07)
WSC XXXXX:	Dealer identification number of dealer with which coding was last performed

NOTE:

As of April 2002, operating and display modules, Climatronic Control Module J255 with part number index "H" onwards (with software version as of "XX15") have gradually been installed. With these operating and display modules, Climatronic Control Module J255 the passenger compartment temperature regulation is designed somewhat cooler.
Vehicles as of Model Year 2003 are only to be installed with operating and display modules, Climatronic Control Module J255 with part number index "H" onwards.
Vehicles with 4-cyl. engine and gasoline direct injection (FSI) are only to be installed with operating and display modules, Climatronic Control Module J255 with part number index "H" onwards.
Vehicles up to VIN "399999" in Model Year 2005 (Saloon and Avant; gradual introduction for the Cabrio in week 46/04 with no prior specification of any particular VIN ) are not to be installed with operating and display modules, Climatronic Control Module J255 with part number index "AJ" onwards.
Vehicles as of VIN "400000" in Model Year 2005 (Saloon and Avant; gradual introduction for the Cabrio in week 46/04 with no prior specification of any particular VIN ) are only to be installed with operating and display modules, Climatronic Control Module J255 with part number index "AJ" onwards.
The operating and display module, Climatronic Control Module J255 switches automatically to "ECON" mode if, following installation of a new operating and display module, Climatronic Control Module J255, basic setting was not performed or if the pressure measured by the High Pressure Sensor G65 is too low or too high (the compressor must not be activated) → Read Measuring Value Block (function 08) . This status is displayed as being a malfunction as of hardware/software version "0711".
If, after switching on the ignition, the operating and display module, Climatronic Control Module J255 switches automatically to "Off" mode and if it is only possible to set "Def" mode (no other settings possible) with the ignition switched on, check the assignment of the ignition key. If, for example, the ignition has been switched on using a key which has not been released for this vehicle or the Instrument Cluster Control Module J285 does not transmit a key number via the CAN-Bus comfort system (provided as of hardware/software version "0711"), functioning of the operating and display module, Climatronic Control Module J255 is restricted to these modes.
As of hardware/software version "0711", the operating and display module, Climatronic Control Module J255 saves the VIN transmitted via the CAN-Bus comfort system. If an operating and display module, Climatronic Control Module J255 which has already been installed is installed in a different vehicle, this is detected by the operating and display module, Climatronic Control Module J255 and the malfunction "Control module incorrect Vehicle Identification Number (VIN)" is stored. If this malfunction is displayed, the old VIN must be erased via the "Adaptation" function → Climatronic Control Module J255, Adaptation (function 10) .
With the Audi Cabrio, different settings are stored for closed and open convertible top in the operating and display module, Climatronic Control Module J255. On opening and closing the convertible top, the operating and display module, Climatronic Control Module J255 then automatically alters the setting to the value last set with convertible top closed or open.