Remove/install COMAND controller unit - AR82.85-P-1100LW

Model 205 with code 520 (Audio 20 USB)

Model 205 with code 522 (Audio 20 radio)

Model 205 with code 531 (COMAND APS)

Model 253 with code 520 (Audio 20 USB)

Model 253 with code 522 (Audio 20 radio)

Model 253 with code 531 (COMAND APS)

Fig 1: Identifying COMAND Controller Unit Remove/Install Components - Shown With Code 531

Courtesy of MERCEDES-BENZ USA

Shown with CODE 531 (COMAND APS)

	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Notes on avoiding damage to optical fibers during repair work		AH82.60-P-0001-05AK
	Remove/install
1	Connect diagnostic system and perform initial startup of head unit (A26/17)	When replacing head unit (A26/17).
			AD00.00-P-2000-04B
2	Switch off ignition and remove transmitter key
3.1	Remove cover on center console	Model 205 with transmission 722, 724, 725 with code 520 (Audio 20 USB) Model 205 with transmission 722, 724, 725 with code 522 (Audio 20 radio) Model 205 with transmission 722, 724, 725 with code 531 (COMAND APS) Model 253 with transmission 724, 725 with code 520 (Audio 20 USB) Model 253 with transmission 724, 725 with code 522 (Audio 20 radio) Model 253 with transmission 724, 725 with code 531 (COMAND APS)
3.1	Remove cover on center console		AR68.20-P-2350LW
3.2	Remove cover for upper control panel control unit	Model 205 with transmission 716 with code 520 (Audio 20 USB) Model 205 with transmission 716 with code 522 (Audio 20 radio) Model 205 with transmission 716 with code 531 (COMAND APS) Model 253 with transmission 716 with code 520 (Audio 20 USB) Model 253 with transmission 716 with code 522 (Audio 20 radio) Model 253 with transmission 716 with code 531 (COMAND APS)
3.2	Remove cover for upper control panel control unit		AR68.20-P-2313LW
4	Loosen screw/bolts (1) at locks (2)	Screws/bolts (1) remain at locks (2).
5	Guide head unit (A26/17) at locks (2) out of instrument panel
6	Remove head unit (A26/17) from locks (2) until electrical female connector (3) and electrical connectors (4) are accessible	Retaining bolts (arrows) of head unit (A26/17) must be inserted into the locks (2).
7	Disconnect electrical female connector (3) and electrical connectors (4)	The number of electrical connectors (4) can vary depending on the equipment installed.
8	Remove head unit (A26/17)
9	Install in the reverse order