A8 Quattro Sedan V8-4.2L (BVJ) (2008)
‹› Two rotary knobs are attached. They can be removed and replaced separately.
Perform the following steps after replacing Climatronic Control Module (J255) front A/C control head Vehicle diagnosis, testing and information
system VAS 5051 in "Guided Fault Finding" function.
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Check encoding.
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Implement basic setting.
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Check adaption
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Check the DTC memory.
‹› From model year 2009, the Climatronic Control Module (J255) front A/C control head with part number 4E0 820 043 from index "J" will be
installed as a running change. On vehicles with these front A/C control heads, the screen in the "MMI" display will not switch to "A/C system"
when the buttons and knobs on the front A/C control head are pressed. The selected A/C system functions are shown in the running display.
Certain A/C system functions in these vehicles are selected and activated with the rotary knobs on the "MMI" unit => Owner's Manual and =>
"Infotainment/MMI " Owner's Manual. On these front A/C control heads, the Setup button is replaced with the A/C button and the ON /OFF
button is replaced with the OFF button => Owner's Manual.
‹› On vehicles that have a Climatronic Control Module (J255) front A/C control head without the Setup button, select the additional functions
through the "Multi Media Interface (MMI) terminal" => Owner's Manual and => "Infotainment/MMI" Owner's Manual.
‹› Make sure the Climatronic Control Module (J255) front A/C control head is allocated correctly to the Information Electronics Control Module 1
(J794). There are different versions. If the allocation is incorrect, various A/C system functions cannot be displayed and selected in the MMI.