Remove/install towing sensor control unit - AR54.21-P-0011GM

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 Towing Sensor Control Unit

Courtesy of MERCEDES-BENZ USA

	Remove/install
1	Activate service mode in Telematic Alarm Identification on Demand (emergency call system) (TELE AID)	Only on model 463.243/244/245/250/309/322/323/332/333 with code (ET2) Tele-Aid -car telephone emergency call system, 463.247/248/254/270 up to 1.04.07 with code (ET2) Tele-Aid - car telephone emergency call system	AR82.95-P-0005-03GR
	Notes regarding the Tele-Aid emergency call system	Model 463.243/244/245/250/309/322/323/332/333, Model 463.247/248/254/270 up to 1.04.07	AH82.95-P-0001-01GA
	Risk of explosion  caused by oxyhydrogen gas. Risk of poisoning and caustic burns  caused by swallowing battery acid. Risk of injury  caused by burns to skin and eyes from battery acid or when handling damaged lead-acid batteries	No fire, sparks, open flames or smoking. Wear acid-resistant gloves, clothing and glasses. Only pour battery acid into suitable and appropriately marked containers.	AS54.10-Z-0001-01A
2	Disconnect battery ground line	All models except 463.236/248 with code (979) Special protection version	AR54.10-P-0003G
		Model 463.236/248 with code (979) Special protection version, with code (ZS6) Special protection version FB6, with code (E26) 100 Ah additional battery incl. cutoff relay, Model 463.236/248 with code (979) Special protection version, with code (ZS7) Special protection version FB7, with code (E26) 100 Ah additional battery incl. cutoff relay,	AR54.10-P-0003PM
	Notes on battery	All models	AH54.10-P-0001-01A
3	Remove center console	Model 463.202/222/236/243/244/245/247/248/250/254/270/303/306/309/322/323/332/333/336/340/341/346	AR68.20-P-2000GA
		Model 463.237/246/249/271	AR68.20-P-2000US
4	Remove rear signal acquisition and actuation module (SAM) (N10/2)		AR54.21-P-1259GM
5	Disconnect electrical connector on control unit for tow-away protection (N27)
6	Detach retaining plate with control unit for tow-away protection (N27)
7	Install in the reverse order
8	Deactivate service mode in Telematic Alarm Identification on Demand	Only on model 463.243/244/245/250/309/322/323/332/333 with code (ET2) Tele-Aid -car telephone emergency call system, 463.247/248/254/270 up to 1.04.07 with code (ET2) Tele-Aid - car telephone emergency call system	AR82.95-P-0005-03GR
	Notes regarding the Tele-Aid emergency call system	Model 463.243/244/245/250/309/322/323/332/333, Model 463.247/248/254/270 up to 1.04.07	AH82.95-P-0001-01GA
9	Read out fault memory and erase	STAR DIAGNOSIS Stored faults which can result from cables being disconnected or from simulation during removal and installation or test work, have to be processed and erased in the fault memories after completing the work.
	Connect STAR DIAGNOSIS and read out fault memory		AD00.00-P-2000-04A
10	Perform basic programming		AR00.19-P-0200P