Remove/install front SAM control unit - AR54.21-P-1254MCU

MODEL 451.3/4 

Fig 1: Identifying Front SAM Control Unit Remove/Install Components

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Notes on avoiding damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
1	Turn off ignition
2	Disconnect ground line of battery		AR54.10-P-0003MCC
3	Adjust the left front seat to the rear
4	Unclip left tweeter from the dashboard and place to one side with the electric line connected	Vehicles up to 30.8.10 with code (C17) Sound package (2 tweeters, 2 bass reflex boxes and diplexer) (FFO) or Vehicles with code (C54) Sound system 2	AR82.62-P-1000MCC
5	Unclip SAM control unit (N10/10) in the rear area (arrow A) and fold down forwards
6	Unscrew bolts (1) and carefully lower the SAM control unit (N10/10) until the electrical connectors (3) are accessible
7	Unclip cover (5) on SAM control unit (N10/10)
8	Unscrew nut (6) and remove positive battery cable (4)	If the nut (6) is detached from the positive battery cable (4), it must be replaced by a collar nut.
9	Remove additional fuses (2) with connector on SAM control unit (N10/10)	The number of additional fuses may vary (2) depending on the vehicle model and equipment. Remove additional fuses (2) with connector as the connectors are coded.
10	Separate electrical connectors (3) and electrical connector (arrow B)
11	Remove SAM control unit (N10/10) from the vehicle
12	Install in the reverse order
13	Flash the SAM control unit (N10/10)	When replacing the SAM control unit (N10/10).	AR54.21-P-0012MCU