Retrofit trailer coupling - AN31.10-P-8080M

MODEL 220.026 /028 /063 /065 /070 /075 /128 /165 /170 /175 /178 1# up to 31.8.02 except CODE (772) AMG styling package - front spoiler, side skirts and rear apron Mechanical swing-away trailer hitch MK1 

MODEL 220.025 /028 /063 /067 /070 /075 /083 /084 /087 /128 /167 /170 /175 /176 /183 /184 /187 1# as of 1.9.02 except CODE (772) AMG styling package - front spoiler, side skirts and rear apron except CODE (855) TELE AID except CODE (979) Special protection version Mechanical swing-away trailer hitch MK1, as of model year 2003 (CODE) 803 

Fig 1: Identifying Retrofit Trailer Coupling Components Function

Model 220.025 only 

Check the fan motor's part number. It can be found on the upper left of the fan shroud (3) (see magnified view).

Fan motors with the part number A 220 500 01 93 are rated at 650 watts.

Fan motors with the part number A 220 500 02 93 are rated at 850 watts.

If a shroud with the 650 fan motor is currently installed, it will have to be replaced with the installation of an 850 fan motor. If an 850 watt fan motor is already installed, no additional modifications will be required.

Failure to retrofit this component will render the warranty/goodwill warranty invalid.

Fig 2: Identifying Fan Motor With Part Number

	Remove
	Notes on installing a trailer coupling	Model 220.	AH31.10-P-1000-02M
	Notes on EU type approval requirements	Applies only to countries within the European Union. Information on obtaining approval for installed trailer hitches at an approved inspection station (Technical Inspection Association).	AH31.10-P-1000-03T
1	Connect no load current retention unit	Quiescent current retention unit, CMP 12.2.	*WH58.30-Z-1012-09A
2	Remove battery
			AR54.10-P-0005I
3	Remove coverings in trunk	The rear wall paneling does not need to be removed.
			AR68.30-P-4600M
4.1	Remove CD changer
		220.0 /1 up to 31.8.02 with CODE (819) CD-changer (6CDs).	AR82.64-P-7507I
		220.0 /1 as of 1.9.02 with CODE (819) CD-changer (6CDs) with common bracket for CD-changer and navigation processor.	AR82.64-P-7507MN
5	Remove plastic cover in left rain trough on rear fender
6	Remove rear seat backrest
	Vehicles without  code (223b) electrically adjustable rear bench seat, without  code (224c) Electrically adjustable individual rear seats, with seat ventilation, heated seats and memory package		AR91.12-P-1620MA
		Vehicles with CODE  (223b) Electrically adjustable rear bench seat.	AR91.12-P-1620M
			Vehicles with  code (224c) Electrically adjustable individual rear seats, with seat ventilation, heated seats and memory package. AR91.12-P-1620MB
7	Fold back insulation mat behind right rear seat
8	Remove control unit holder below right rear seat
9	Remove rear SAM control unit with fuse and relay box	Do not disconnect electrical wiring plugs.
			AR54.21-P-1259I
10	Remove rear bumper
			AR88.20-P-2200M
11	Remove exhaust system as of flange connection	Refer to Removing exhaust system complete: ↓
		Engine 112, 113.	AR49.10-P-7000AA
		Engine 137.970 in 220.178.	AR49.10-P-7000L
		Engine 613.960.	AR49.10-P-7000M
		Engine 628.960 in MODEL 220.028/128.	AR49.10-P-7000MB
12	Remove screens at left and right above the rear muffler
13.1	Remove engine mounts	Models 220.063 /065 /067 /087 / 165 /167 /187 only. Replace both front engine mounts with the new mounts supplied as part of the package contents.
		engine 112.975.	AR22.10-P-1100IW
		Engine 112.922 /944 /972.
14.1	Remove fan shroud	Applies only to Model 220.025 with 650 watt electric fan. Installation:  Replace the factory-installed fan shroud with the 650 watt electric fan by installing a shroud with an 850 watt electric fan in its place.
	Install
15.1	Retrofit additional cooler	Applies to vehicles with Engine 613.960 only Additional radiator coolant	AN20.20-P-1000A
16	Retrofit mechanical detachable parts	Do not remove the transport locking element on the swiveling ball neck until the release lever has been installed.	AN31.11-P-8080-05M
		Nut, trailer coupling to rear center assembly	*BA31.11-P-1001-01A
		Bolt, trailer coupling to side member reinforcement	*BA31.11-P-1002-01A
		Collar nut, side member reinforcement to frame side member	*BA31.11-P-1003-01A
		Bolt, bumper to bumper reinforcement	*BA31.11-P-1004-01A
17	Retrofit release lever		AN31.11-P-8080-06M
18	Retrofit trailer coupling control unit		AN31.19-P-8080-05M
19	Connect wiring harness		AN31.19-P-8080-03M
20	Install rear bumper
		Model 220 with CODE (550) trailer hitch	AR88.20-P-2200MA
		Nut securing bumper reinforcement to trailer hitch	*BA31.11-P-1005-01A
21	Install in the reverse sequence	Steps 14.1 up to 1.
	Check
22	Perform version coding subsequently
23	Conduct operational check of swivel-mounted trailer coupling	If the detent on the ball neck fails to engage securely, the LED in the trailer hitch release mechanism (A63) will start to flash (see arrow). The LED stops flashing when the trailer hitch is engaged in one of the end positions or after approx. 8 minutes.
24	Conduct operation check of the light activation signal at the 13-pin trailer hitch socket (X58)	Model 220.	AN31.19-P-8100-06MN
25	Enter special equipment in the vehicle data card and in the vehicle's online data card	Trailer hitch, Code (550).

The following applies throughout the European Union:

TRAILER COUPLING MECHANICAL SYSTEM