Available functions

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.

Diagnostic Operation System VAS 5051A		Ignition switched on, engine not running	Engine idling	Vehicle in drive mode	Refer to
Address words
08	A/C heater electronics	Yes	Yes	Yes	→ Diagnostic Operation System VAS 5051A, connecting and selecting functions
00	Automatic test sequence	Yes	Yes	Yes	→ Diagnostic Operation System VAS 5051A, connecting and selecting functions
Functions
01	Checking control module version	Yes * See note¹	Yes * See note¹	Yes * See note¹	→ Diagnostic Operation System VAS 5051A, connecting and selecting functions
02	Checking DTC Memory	Yes	Yes	Yes	→ Diagnostic Trouble Code (DTC) Memory, checking (function 02)
03	Output Diagnostic Test Mode (DTM)	Yes/No * See note²	No/Yes * See note²	No * See note²	→ Output Diagnostic Test Mode (DTM) (function 03)
04	Performing basic setting	Yes	Yes	No	→ Basic Setting (function 04)
05	Erasing DTC Memory	Yes	Yes	Yes	→ Diagnostic Trouble Code (DTC) Memory, erasing (function 05)
06	End of output	Yes	Yes	Yes	→ End Output (function 06)
07	Coding control Module	Yes * See note³	Yes * See note³	No	→ Climatronic Control Module J255, coding (function 07)
08	Read measuring value block	Yes	Yes	Yes	→ Read Measuring Value Block (function 08)
10	Adaptation * See note⁴	Yes	Yes	No	→ Climatronic Control Module J255, Adaptation (function 10)

* 1- The control module version is always displayed on the Diagnostic Operation System VAS 5051A during the On Board Diagnostic (OBD) process.

* 2- Output Diagnostic Test Mode (DTM) diagnosis can only be performed up to an engine speed of 3000 RPM and at vehicle speeds below 5 km/h. The A/C Compressor Regulator Valve N280 is only activated by the operating and display module, Climatronic Control Module J255 with the engine stopped. The request for activation of the Coolant fan (1 to 100%) is transmitted by the operating and display module, Climatronic Control Module J255 to the relevant engine control module via the comfort and drive CAN-Bus systems. However, the engine control module only switches on the Coolant Fan V7 when the engine is running "Guided Fault-Finding" Vehicle Diagnosis, Testing Info. System VAS5051B or Vehicle Diagnosis Service Syst. VAS5052.

* 3- On this vehicle, the basic settings (e.g. country version, left-hand drive or right-hand drive) of the operating and display module, Climatronic Control Module J255 are coded by the Instrument Cluster Control Module J285. The data are transmitted via the CAN-Bus comfort system to the operating and display module, Climatronic Control Module J255. The currently valid code is displayed in the measuring value block → Read Measuring Value Block (function 08) . Direct coding in the operating and display module, Climatronic Control Module J255 is only provided for certain optional equipment (e.g. Heated Windshield Z2 or sunroof with solar cells, etc.). "Guided Fault-Finding" Vehicle Diagnosis, Testing Info. System VAS5051B or Vehicle Diagnosis Service Syst. VAS5052

* 4- As of the hardware/software version "0711" of the operating and display module, Climatronic Control Module J255, the VIN transmitted via the CAN-Bus comfort system is stored on initial start-up of the operating and display module, Climatronic Control Module J255. If such an operating and display module, Climatronic Control Module J255 is installed in a different vehicle, this VIN must be erased via the "Adaptation" function.

NOTE:

This article describes On Board Diagnostic (OBD) using the Diagnostic Operation System VAS 5051A.
On Board Diagnostic (OBD) can be performed using the Vehicle Diagnosis Service Syst. VAS 5052, the Fault Read Out Device V.A.G 1551 or the Mobile Scan Tool V.A.G 1552. In order to have a record of any faults, it is appropriate to connect the Diagnostic Operation System VAS 5051A or the Fault Read Out Device V.A.G 1551 before erasing the DTC memory and to print out the faults present (the Mobile Scan Tool V.A.G 1552 is not equipped with a printer).
If a new operating and display module, Climatronic Control Module J255 has been installed and Basic Setting was not performed after installation, the A/C Compressor Regulator Valve N280 is not activated and display group "002" in the measuring value block indicates compressor shutoff condition "6".
A/C control is not interrupted when starting On Board Diagnostic (OBD). It is however deactivated on selecting the following functions: "Output Diagnostic Test Mode (DTM) diagnosis", "Basic setting procedure".
Control function remains fully operational when other functions are selected.
For install locations of air conditioner components, refer to → A/C system control and regulation components .