Remove/install multifunction steering wheel electronics unit - AR54.21-P-2050SX

MODEL 216, 221.0/1 

Fig 1: Identifying Multifunction Steering Wheel Electronics 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
	Multifunction steering wheel electronics units (A74/1) that have already been replaced must be identified by an adhesive label.
1	Remove steering wheel (1)	The multifunction steering wheel electronics unit (A74/1) should be replaced once only in the steering wheel (1). If it has to be removed again, the steering wheel (1) must be replaced.	AR46.10-P-0100SX
2	Separate electrical connectors (2)
3	Remove bolts (3)		*BA46.10-P-1002-02I
4	Remove multifunction steering wheel electronics unit (A74/1)
5	Transfer springs (4)	Make sure that the retaining lugs are engaged correctly.
6	Blow out threaded holes (5) in steering wheel (1)
7	Install in the reverse sequence

STEERING WHEEL

Number	Designation		Model 216	Model 221
BA46.10-P-1002-02I	Bolt, electronic unit to steering wheel	Nm	7	7