Climatronic Control Module J255, removing and installing: Notes

WARNING: This page does not describe the selected car, but rather 17 other vehicles, including the 2009 Audi S4, 2009 Audi A4, 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.

NOTE:

Depending on the date of issue, the operating and display module, Climatronic Control Module J255 may also be referred to as A/C Control Head E87 in various workshop publications (e.g. in wiring diagrams for vehicles up to Model Year 2004).

Removing and installing operating and display module, Climatronic Control Module J255.

There are different versions of the operating and display module, Climatronic Control Module J255, the part number index must therefore be observed

With and without radio navigation system (or radio with large control panel)
With and without switch for seat heating
With Off button or with "Automatic air recirculation" button (vehicles with Air Quality Sensor G238
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.

NOTE:

When replacing operating and display module, Climatronic Control Module J255, attention must be paid to exact assignment .
After installing an operating and display module, Climatronic Control Module J255, perform air conditioner basic setting in the specified manner → Basic Setting (function 04) .
If a new operating and display module, Climatronic Control Module J255 has been installed and basic setting not performed, the A/C Compressor Regulator Valve N280 is not activated and shutoff condition "6" appears in measuring value block "2" when performing air conditioner On Board Diagnostic (OBD).
The functions selected are indicated by lighting of LEDs in the various operating and display module, Climatronic Control Module J255 buttons.
With this version of the operating and display module, Climatronic Control Module J255, the Instrument Panel Interior Temperature Sensor G56, the Interior Temperature Sensor Fan V42 and the Heated Rear Window switch (including potentiometers for heated seats) are integrated and cannot be replaced separately.
After replacement of the operating and display module, Climatronic Control Module J255 :
- Always code operating and display module, Climatronic Control Module J255 → Climatronic Control Module J255, coding (function 07) .
- Always perform basic setting → Basic Setting (function 04) .
- Always check DTC memory → Diagnostic Trouble Code (DTC) Memory, checking (function 02) .
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) . The direct entry of a code in the operating and display module, Climatronic Control Module J255 is provided for certain items of equipment (e.g. Heated Windshield or sunroof with solar cells) "Guided Fault-Finding" Vehicle Diagnosis, Testing Info. System VAS5051B or Vehicle Diagnosis Service Syst. VAS5052.
The unit (°C or °F) for the temperature display of the operating and display module, Climatronic Control Module J255 is transmitted by the Instrument Cluster Control Module J285 and is determined by the code entered in this.
The module used for the display can be switched by simultaneously pressing the "Air recirculation mode" and "Temperature +" buttons for the left side for more than 2 seconds.
The operating and display module, Climatronic Control Module J255 then transmits the ambient temperature with the altered unit to the Instrument Cluster Control Module J285. The Instrument Cluster Control Module J285 adopts this change. The same unit is used for the display in the operating and display module, Climatronic Control Module J255 and the ambient temperature display in the instrument cluster.
Switching of the unit used for the display in the operating and display module, Climatronic Control Module J255 applies to all ignition keys.
As of April 2002, operating and display modules, Climatronic Control Module J255 with part number index "H" onwards (with hardware/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 to be somewhat cooler.
As of Model Year 2003, operating and display modules, Climatronic Control Module J255 with part number index "H" onwards (with hardware/software version as of "XX16") have gradually been installed. These operating and display modules, Climatronic Control Module J255 differ as follows from the model with software version "XX15" :
- Modified passenger compartment temperature regulation for Audi Cabrio and open convertible top (designed to be somewhat cooler)
- Extended temperature adjustment range; 16 °C (instead of 18 °C) is now the lowest temperature which can be set
- 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.
If the operating and display module, Climatronic Control Module J255 displays a number, check the DTC memory of the operating and display module, Climatronic Control Module J255 (the number "60" for example indicates a fault at the Interior Temperature Sensor Fan V42). If the display of the operating and display module, Climatronic Control Module J255 flashes and No fault is displayed in the DTC memory (e.g. with display "09"), there is a malfunction in the electronics of the operating and display module, Climatronic Control Module J255.