Remove/install airbag/belt tensioner control unit - AR91.60-P-0622GM

MODEL 463.202/222/236/237/243/244/245/246/247/248/249/250/254/270/271/303/306/309/322/323/332/333/336/340/341/346 

Fig 1: Identifying Airbag/Belt Tensioner Control Unit

Courtesy of MERCEDES-BENZ USA

	Remove/install
1	Remove tow-away protection control unit		AR54.21-P-0011GM
2	Unscrew emergency tensioning retractor (ETR [GUS]) with airbag (AB) control unit (N2/2) from body and remove	Installation:  Mount ground line to ground (restraint systems control unit) (W26) provided.
3	Disconnect electrical connector from emergency tensioning retractor (ETR [GUS]) with airbag (AB) control unit (N2/2)
4	Install in the reverse order
5	Read out fault memory and erase	STAR DIAGNOSIS: Stored faults which can result from cables being disconnected or from simulation during assembly or testing work have to be processed and erased in the fault memories after completing work.
	Connect STAR DIAGNOSIS and read out fault memory		AD00.00-P-2000-04A
6	Perform basic programming		AR00.19-P-0200P