Remove/Install Touchpad Control Unit - AR54.21-P-0503ME

Model 167 

Fig 1: Touchpad Control Unit Components Location - Model 167

Courtesy of MERCEDES-BENZ USA

Topical note	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Remove/install
1	Perform commissioning of touchpad (A105).	If the touchpad (A105) is replaced.	AD00.00-P-2000-06ME
2	Switch off ignition and store transmitter key outside of transmitter range (min. 2 m).
3	Unclip handrest (1) at the rear end upward (arrow A) and remove toward rear.
4	Unscrew screws (2) and remove base of handrest (1).
5	Unclip cover (4) from front to rear until the electrical connectors underneath it are accessible. 1	Long wedge	Fig 2
6	Release electrical connectors, disconnect and remove cover (4).	The number of electrical connectors varies according to vehicle equipment.
7	Unscrew screws (3) and remove touchpad (A105).
8	Install in the reverse order.

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

Courtesy of MERCEDES-BENZ USA