Remove/install rear SAM control unit - AR54.21-P-1269RT

MODEL 251 

Fig 1: Identifying Rear Sam Control Unit Remove/Install Components - Shown On Vehicle With Spare Tire

Courtesy of MERCEDES-BENZ USA

Shown on vehicle with spare tire on steel rim, code 669 

Fig 2: Identifying Rear Sam Control Unit Remove/Install Components - Shown On Vehicle With Spare Tire

Courtesy of MERCEDES-BENZ USA

Shown on vehicle with spare tire on steel rim, code 669 

Fig 3: Identifying Rear Sam Control Unit Remove/Install Components - Shown On Vehicle Without Spare Tire

Courtesy of MERCEDES-BENZ USA

Shown on vehicle without spare tire on steel rim, code 669 

	Remove/install
	Notes on avoiding damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
1	Read out coding from rear SAM control unit (N10/8) using STAR DIAGNOSIS	Only when exchanging the rear SAM control unit (N10/8) and if it can still be read out using STAR DIAGNOSIS.
	Connect STAR DIAGNOSIS and read out fault memory		AD00.00-P-2000-04A
		STAR DIAGNOSIS diagnosis system	*WH58.30-Z-1048-13A
2	Open tailgate
3	Remove luggage compartment cover	On vehicles with luggage compartment cover, code 723.
4	Open load compartment floor (1) at the handle (20), fold upwards (arrow) and secure
5.1	Open retaining strap (23), take out jack (22), unscrew mounting bolt (25), lift the spare tire (2) and the plastic insert (24) under it out of the vehicle	On vehicles with code 669 spare tire on steel rim When lifting out, cover the trunk sill with a rag for example otherwise the paint of the trunk sill and/or the steel rim may become damaged.
5.2	Unscrew mounting bolt (25) and lift the vehicle tool kit molded part (26) out of the vehicle	On vehicles with code 669 spare tire on steel rim Lift the vehicle tool kit molded part (26) first, then lift out upwards at an angle otherwise the lugs on the bottom side may break off.
6	Remove right spare tire well trim (3)	Slip out wiring harness.
7	Using a suitable tool, press the clips (5) towards the rear SAM control unit (N10/8) and pull out of the bracket
8	Unlock plug (4) and detach from rear SAM control unit (N10/8)	The number of plugs (4) can vary depending on the vehicle equipment.
9	Remove rear SAM control module (N10/8)
10	Install in the reverse order
11	Code the rear SAM control unit (N10/8)	Only when installing a new rear SAM control unit (N10/8).
	Connect STAR DIAGNOSIS and read out fault memory		AD00.00-P-2000-04A
		STAR DIAGNOSIS diagnosis system	*WH58.30-Z-1048-13A