Audi Workshop Service and Repair Manuals

List of adaption channels   Note t  Adaption channels “01”, “02”, “06” and “07” are only active on vehicles fitted with an auxiliary heater as optional extra. On these vehicles, data are exchanged between the operating and display unit, Climatronic control unit -J255-, the auxiliary heater control unit -J364- and the control unit in dash panel insert -J285- by way of the convenience data bus system. t  Adaption channels “08”, “09” and “81” are only provided for operating and display units, Climatronic control unit -J255- as of hardware/software version “0711”. t  Adaption channels “10” to “16” are only provided for operating and display units, Climatronic control unit -J255- as of hardware/software version “1323” (gradual introduction at the factory as of 09.03). t  Adaption channels “17” to “19”, “21” to “80” and “82” onwards are not used at present. t  Adaption channel “20” is only used with operating and display units, Climatronic control unit -J255- with part number index “AJ” onwards (intended for resetting of all altered settings to factory adaption). These operating and display units, Climatronic control unit -J255- are fitted on vehicles as of chassis number “400000” in Model Year 2005 (Saloon and Avant) and “012913” in Model Year 2005 (Cabrio) → Parts catalogue. t  Adaption channels “01” and “02” can be used to enter a temperature increase in the operating and display unit, Climatronic control unit -J255- of max. 4° C (input value up to “8”) in auxiliary heating mode. t  If the setting entered in adaption channel “03” is “0”, a note is to be made in the vehicle documentation to the effect that the air conditioning system compressor regulating valve -N280- can no longer be deactivated by the engine control unit by way of the “air conditioner compressor shutoff” function. t  Adaption channel “07” can be used to enter the function auxiliary heater deactivation by operating and display unit, Climatronic control unit -J255-. Auxiliary heater actuation can also be set in the control unit in dash panel insert -J285- by way of the adaption function (adaption channel “18”) → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051 and → Electrical system; Rep. Gr. 01.

Adaption channel	Basic setting at factory	Function	Altering basic setting, Page
01	0 (or 4) → Note1	Temperature increase after starting auxiliary heating/ventilation mode t  If, with the ignition switched off, the operating and display unit, Climatronic control unit -J255- is actuated by way of the convenience data bus system in auxiliary heating/auxiliary ventilation mode, the operating and display unit, Climatronic control unit -J255- regulates the specified temperature in the vehicle by the entered amount above the specified temperature set. –  In basic setting “0” → Note, the specified temperature in auxiliary heating/auxiliary ventilation mode is set to the same level as the specified temperature in air conditioning mode –  In basic setting “4” → Note, the specified temperature in auxiliary heating/auxiliary ventilation mode is set to 2 °C higher than the specified temperature in air conditioning mode –  Depending on version, the adaption function can be used to increase the specified temperature in 0.5° C increments by up to 4.0° C (or 8 °C) (input value “1......8” or “1......16”).	→ Chapter

1)	Depending on the version of the operating and display unit, Climatronic control unit -J255-, the factory setting may be “0” or “4”; alter if applicable.

Adaption channel	Basic setting at factory	Function	Altering basic setting, Page
02	0	Temperature increase at end of specified auxiliary heating/auxiliary ventilation time t  If, with the ignition switched off, the operating and display unit, Climatronic control unit -J255- is actuated by way of the convenience data bus system in auxiliary heating/auxiliary ventilation mode, the operating and display unit, Climatronic control unit -J255- regulates the specified temperature in the vehicle by the entered amount above the specified temperature set. –  In basic setting “0”, the specified temperature in auxiliary heating/auxiliary ventilation mode is set to the same level as the specified temperature in air conditioning mode. –  Depending on version, the adaption function can be used to increase the specified temperature in 0.5° C increments by up to 2.0° C (or 4 °C) (input value “1......4” or “1......8”).	→ Chapter

Adaption channel	Basic setting at factory	Function	Altering basic setting, Page
03	1 (on)	Compressor shutoff by engine control unit via “Air conditioner compressor shutoff” function t  In basic setting “1”, the air conditioning system compressor regulating valve -N280- (and thus the compressor) is switched off as soon as the request is received from the engine control unit via the convenience data bus system (e.g. on acceleration) → Chapter (Reading measured value block, display group “002”) –  The adaption function can be used to suppress deactivation of the air conditioning system compressor regulating valve -N280- on account of “air conditioner compressor shutoff” by changing the adaption to “0” (the operating and display unit, Climatronic control unit -J255- ignores the request)	→ Chapter
04	0 → Note	Engine/air conditioner compressor transmission ratio t  Adaption cannot be altered; assignment is specified in operating and display unit, Climatronic control unit -J255-. –  The assignment to the relevant engine is transmitted via the convenience data bus system

2)	Depending on version of operating and display unit, Climatronic control unit -J255- and engine

Adaption channel	Basic setting at factory	Function	Altering basic setting, Page
05	1	Extended air conditioner requirement t  Adaption cannot be altered; assignment is specified in operating and display unit, Climatronic control unit -J255-.
06	0	Decision-making process for auxiliary heating/auxiliary ventilation mode t  If the auxiliary heater is started up by way of remote control or by the control unit in dash panel insert -J285- on the basis of a specified activation time (via the convenience data bus system), this determines the auxiliary heater starting mode –  In basic setting “0” (automatic) and with ignition off, the operating and display unit, Climatronic control unit -J255- determines by way of the measured actual temperatures and the set specified temperatures whether the auxiliary heater is to be started up or the system is to operate in auxiliary ventilation mode. –  In setting “1” (last function), the operating and display unit, Climatronic control unit -J255- always requests the last mode set (“Auxiliary heating” or “Auxiliary ventilation” mode activated manually in dash panel insert) regardless of the measured/set temperatures.	→ Chapter

Adaption channel	Basic setting at factory	Function	Altering basic setting, Page
07	0	Shutoff characteristics for auxiliary heating/auxiliary ventilation mode t  If the engine is started with auxiliary heating/auxiliary ventilation activated and switched off again before the end of the set auxiliary heating/auxiliary ventilation operating time: –  In setting “0”, auxiliary heating/auxiliary ventilation remains in operation until the set operating time has elapsed or until manually shut off (e.g. if the engine is switched off at a level crossing, the operating and display unit, Climatronic control unit -J255- does not transmit deactivation information via the convenience data bus system) –  In setting “1”, auxiliary heating/auxiliary ventilation is deactivated on switching off the engine (e.g. if the vehicle is only driven short distances, the operating and display unit, Climatronic control unit -J255- transmits deactivation information via the convenience data bus system).	→ Chapter

Note t  Adaption “1” in adaption channel “07” is only to be entered for operating and display units, Climatronic control unit -J255- up to software version “XX13” if auxiliary heating/auxiliary ventilation is activated by way of remote control. As the ignition must be switched on for activation of the auxiliary heating/auxiliary ventilation “Immediate on” function, activation is cancelled again on switching off the ignition with these operating and display units, Climatronic control unit -J255-. As of software version “XX14”, the function is then as described above. t  The auxiliary heating/auxiliary ventilation shutoff characteristics can also be set in the control unit in dash panel insert -J285- and the auxiliary heater control unit -J364-. → Auxiliary heating; Rep. Gr.01 (adaption of auxiliary heater).

Adaption channel	Basic setting at factory	Function	Altering basic setting, Page
08	3480 or 6400 → Note	Reduction of fresh air blower speed on voice recognition t  To improve voice recognition and the clarity of telephone voice input, the fresh air blower speed is reduced to the set value on vehicles as of Model Year 2002 (with operating and display unit, Climatronic control unit -J255- as of hardware/software version “0711”). The reduction takes effect as soon as the message “Telephone voice input” is transmitted via the convenience data bus system. –  In setting “6800”, the maximum fresh air blower speed is reduced to approx. 25 % –  In the adjustment range “3480” (approx. 15% ) to “22528” (approx. 88% ), “256” units correspond to roughly 1% more or less reduction	→ Chapter

3)	Depending on version of operating and display unit, Climatronic control unit -J255-, “3480” (approx. 15%) or “6800” (approx. 25%)

Adaption channel	Basic setting at factory	Function	Altering basic setting, Page
09	118 (corresponds to 11.8 V)	Undervoltage shutoff value for “Auxiliary ventilation” function –  With operating and display units, Climatronic control unit -J255- fitted at the start of production, this value cannot yet be altered (gradual introduction) t  In setting “118”, the “auxiliary ventilation” function is deactivated at a voltage of 11.8 V by the operating and display unit, Climatronic control unit -J255-. –  To ensure reliable engine starting, the voltage should never be adapted to a value less than 11.3 V (input “113”).	→ Chapter

Adaption channel	Basic setting at factory	Function	Altering basic setting, Page
10	0	Adaption of air flow to windscreen in cooling mode (summer mode) in “Auto” setting on operating and display unit, Climatronic control unit -J255- –  This function is only provided for operating and display units, Climatronic control unit -J255- as of hardware/software version “1323” (gradual introduction at the factory as of 09.03). –  In “Auto” mode, cooled air is routed to the windscreen in summer and may under certain circumstances lead to condensation forming on the outside of the windscreen. t  In setting “0”, the volume of air stored for this setting in the operating and display unit, Climatronic control unit -J255- in accordance with the ambient conditions is routed to the windscreen (corresponds to setting “2” for Rest of World except USA and Japan and setting “1” for USA and Japan) –  In setting “1”, no air is routed to the windscreen in cooling mode (defroster flap is completely closed). –  In setting “2”, a greater volume of air is routed to the windscreen (the defroster flap is opened or closed in accordance with the stored characteristic control curve).	→ Chapter

Adaption channel	Basic setting at factory	Function	Altering basic setting, Page
11		Adaption of characteristic temperature curve in cooling mode (summer mode) –  This function is only provided for operating and display units, Climatronic control unit -J255- as of hardware/software version “1323” (gradual introduction at the factory as of 09.03). –  Different characteristic control curves are stored for cooling and heating mode. The setting in this adaption channel can be used to alter the characteristic curve in cooling mode without influencing the characteristic curve in heating mode (winter mode). t  In setting “0”, the operating and display unit, Climatronic control unit -J255- regulates the temperature to the values assigned to this code (corresponds to setting “2” for Rest of World except USA and Japan and setting “3” for USA and Japan). –  In setting “1”, the temperature in cooling mode is regulated on a somewhat warmer characteristic temperature curve than that specified for the Rest of the World. –  In setting “2”, the temperature in cooling mode is regulated in line with the characteristic temperature curve for the Rest of the World (somewhat warmer than with code for USA and Japan). –  In setting “3”, the temperature in cooling mode is regulated to be somewhat cooler than for the Rest of the World (corresponds to characteristic curve stored for USA and Japan encoding). –  In setting “4”, the temperature in cooling mode is regulated to be somewhat cooler again than stored for USA and Japan encoding.	→ Chapter

Adaption channel	Basic setting at factory	Function	Altering basic setting, Page
12		Adaption of fresh air blower characteristic curve –  This function is only provided for operating and display units, Climatronic control unit -J255- as of hardware/software version “1323” (gradual introduction at the factory as of 09.03). t  In setting “0”, the fresh air blower -V2- runs at the output level assigned to this code (corresponds to setting “2” for Rest of World except USA and Japan and setting “3” for USA and Japan). –  In setting “1”, the fresh air blower is actuated at a somewhat lower output level than that specified for the Rest of the World. –  In setting “2”, the fresh air blower is actuated in line with the characteristic curve for the Rest of the World (somewhat lower output level than with code for USA and Japan). –  In setting “3”, the fresh air blower is actuated at a somewhat higher output level than that stored for the Rest of the World (corresponds to characteristic curve stored for USA and Japan encoding).	→ Chapter

Adaption channel	Basic setting at factory	Function	Altering basic setting, Page
13	0	Adaption of characteristic temperature curve during warm-up phase –  This function is only provided for operating and display units, Climatronic control unit -J255- as of hardware/software version “1323” (gradual introduction at the factory as of 09.03). –  To attain the set passenger compartment temperature as soon as possible following a cold start in winter, the operating and display unit, Climatronic control unit -J255- regulates the temperature in the passenger compartment during the warm-up phase to a higher value than that set (the aim is to warm the cold passenger compartment components as quickly as possible). t  In setting “0”, the operating and display unit, Climatronic control unit -J255- regulates the temperature to the values assigned to this code (corresponds to setting “2” for Rest of World except encoding for Scandinavia). –  In setting “1”, the temperature in winter during the warm-up phase is regulated to a somewhat cooler characteristic temperature curve (corresponds to characteristic curve stored for Scandinavia encoding). Special encoding for Scandinavia is not provided at present (introduction not yet finalised), however the corresponding characteristic control curve is already stored. –  In setting “2”, the temperature in winter during the warm-up phase is regulated in accordance with the characteristic curve for the Rest of the World (somewhat warmer than with encoding for Scandinavia).	→ Chapter

Adaption channel	Basic setting at factory	Function	Altering basic setting, Page
14	0	Adaption of characteristic temperature curve over entire control range depending on ambient temperature –  This function is only provided for operating and display units, Climatronic control unit -J255- as of hardware/software version “1323” (gradual introduction at the factory as of 09.03). –  The passenger compartment temperature is regulated by way of different characteristic curves for heating and cooling mode depending on the measured ambient temperature and the specified temperature set t  In setting “0”, the operating and display unit, Climatronic control unit -J255- regulates the temperature to the values assigned to this code (corresponds to setting “2” for Rest of World except USA and Japan and setting “3” for USA and Japan). –  In setting “1”, the temperature is regulated on a somewhat warmer characteristic temperature curve than with encoding for the Rest of the World –  In setting “2”, the temperature is regulated in line with the characteristic curve for the Rest of the World (somewhat warmer than with code for USA and Japan). –  In setting “3”, the temperature is regulated in line with the characteristic curve for USA and Japan (somewhat cooler than with code for Rest of World).	→ Chapter

Adaption channel	Basic setting at factory	Function	Altering basic setting, Page
15	0	Recirculated-air mode operating time during cooling phase after starting –  This function is only provided for operating and display units, Climatronic control unit -J255- as of hardware/software version “1323” (gradual introduction at the factory as of 09.03). –  To ensure that an extremely hot passenger compartment can be cooled as quickly as possible, for example, the operating and display unit, Climatronic control unit -J255- switches the air conditioner to recirculated-air mode approx. 1 minute after starting the engine and if the actual temperature in the passenger compartment exceeds the specified temperature by a certain amount t  In setting “0”, the operating and display unit, Climatronic control unit -J255- regulates the recirculated-air mode operating time during the cooling phase by way of its characteristic control curve (corresponds to setting “2”). –  In setting “1”, switching back to fresh-air mode is implemented sooner than specified by way of the characteristic control curve –  In setting “2”, the recirculated-air mode operating time is controlled in line with the characteristic control curve by the operating and display unit, Climatronic control unit -J255- (this setting is currently active with all codes).	→ Chapter

Adaption channel	Basic setting at factory	Function	Altering basic setting, Page
16	0	Adaption of air flow to footwell in cooling mode (summer mode) in “Auto” setting on operating and display unit, Climatronic control unit -J255- –  This function is only provided for operating and display units, Climatronic control unit -J255- as of hardware/software version “1323” (gradual introduction at the factory as of 09.03). –  In “Auto” mode, no cooled air is routed into the footwell in cooling mode (this is designed to prevent excessive cooling of the foot area) t  In setting “0”, the air flow to the footwell corresponds to that stored for this setting in the operating and display unit, Climatronic control unit -J255- in line with the ambient conditions (corresponds to setting “2”) –  In setting “1”, a greater volume of cooled air is routed to the footwell (the footwell flap is also opened slightly in cooling mode in line with the stored characteristic control curve). –  In setting “2”, only a small volume of cooled air is routed into the footwell (the footwell flap is closed in cooling mode; this setting is currently active with all settings).	→ Chapter

Adaption channel	Basic setting at factory	Function	Altering basic setting, Page
20	0	Resetting of all changes made to settings at operating and display unit, Climatronic control unit -J255- –  This function is only provided with operating and display units, Climatronic control unit -J255- with part number as of index “AJ” fitted on vehicles as of chassis number “400000” in Model Year 2005 (Saloon and Avant) and “012913” in Model Year 2005 (Cabrio) → Parts catalogue. t  If “0” is displayed, all adjustable adaption values are in the factory setting. –  No changes have been made to adaption in adaption channels “01” to “16” of operating and display unit, Climatronic control unit -J255- –  Any changes made to settings have been reset by way of the “Adaption” function t  If “1” is displayed, at least one factory-set adaption has been altered. –  Changes have been made to adaption in adaption channels “01” to “16” of operating and display unit, Climatronic control unit -J255- –  The adaption channels in which changes have been made to the adaption are displayed in the measured value block, display group “028” → Chapter –  To reset all altered settings, change the adaption in this adaption channel to “0” if applicable	→ Chapter

Adaption channel	Basic setting at factory	Function	Altering basic setting, Page
81		Adaption of chassis number t  The “Adaption” function is to be performed for operating and display units, Climatronic control unit -J255- as of hardware/software version “0711” for which the fault “Control unit incorrect chassis number” is displayed.	→ Chapter