Remove/install upper control panel control unit - AR54.21-P-1262RT

MODELS 251 

Shown: Vehicle with COMAND APS USA (with navigation), code 530 and with comfort automatic air conditioning, code 581 

Fig 1: Identifying Upper Control Panel Control Unit Remove/Install Components

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Notes on avoiding damage to electronic components due to electrostatic discharge	All models	AH54.00-P-0001-01A
1	Switch off ignition and remove the transmitter key from the EIS [EZS] control unit	On vehicles with Keyless Go, code 889: Press keyless go start/stop button repeatedly until ignition is switched off Remove transmitter key from vehicle and store it in a location beyond its transmission range (at least 2 m).
2	Unclip center part of instrument panel (2) using long wedge (1), remove and put down on the center console	Put down on a soft base as the center part of the instrument panel (2) and/or the center console may become damaged. Insert the center part of the instrument panel (2) first with the two bottom lugs in the clips (3) then fold upwards and clip in.
		Long wedge	Figure
3	Unlock plug (5) and detach from upper control panel control unit (N72/1)
4	Unscrew bolts (4), remove AAC [KLA] control and operating unit (N22) or comfort AAC control and operating unit (N22/7), then remove upper control panel control unit (N72/1)	Put the AAC [KLA] control and operating unit (N22) or comfort AAC control and operating unit (N22/7) on a soft base as the unit and/or center console may become damaged. Do not disconnect AAC [KLA] control and operating unit (N22) or comfort AAC control and operating unit (N22/7) electrically. Pay attention to different lengths of bolts. Insert the upper control panel control unit (N72/1), before the AAC [KLA] control and operating unit (N22) or comfort AAC control and operating unit (N22/7) is inserted.
5	Install in the reverse order

Fig 2: Identifying Long Wedge (115 589 03 59 00)

Courtesy of MERCEDES-BENZ USA