Remove/Install Horn - AR54.35-S-1556E

Model 447, 448 

Except Code XM0 (Facelift) 

Except Code XM7 (MOPF II) 

Shown on model 447.8, 448 

Courtesy of MERCEDES-BENZ USA

Courtesy of MERCEDES-BENZ USA

Shown on model 447.8, 448 

Shown on model 447.8 with removed bumper 

Fig 1: Horn Components Location - Model 447 Except Code XM0, XM7 (Shown On Model 447.8)

Courtesy of MERCEDES-BENZ USA

Notice	General information on vehicles with high-voltage on-board electrical system and/or lithium-ion battery and/or gaseous-fuel drive system as well as personal protective equipment	Model 447 with Motor 780	AH00.00-Z-0300-01A
	Remove/install
1	Remove the retaining clips (1) and remove the trim (2).	Model 447.8, 448 except code XM0 (Facelift) except code XM7 (MOPF II) Check retaining clips (1). If retaining clips are damaged, ↓ Replace the retaining clips (1).
2	Remove left and right locks (3).	Model 447.8, 448 except code XM0 (Facelift) except code XM7 (MOPF II)
3	Remove left and right holders (4).	Model 447.8, 448 except code XM0 (Facelift) except code XM7 (MOPF II)
4	Open quick-release fastener (5), disengage catch hook (arrow A) and remove left support (6).	Model 447.8, 448 except code XM0 (Facelift) except code XM7 (MOPF II)
5	Open quick-release fastener (7), disengage catch hook (arrow A) and remove right support (8).	Model 447.8, 448 except code XM0 (Facelift) except code XM7 (MOPF II)
6	Push radiator package (10) in direction of arrow and insert assembly wedge (9) into opening of the right holder (4).	Model 447.8, 448 except code XM0 (Facelift) except code XM7 (MOPF II) Only push radiator package (10) rearward far enough so that the assembly wedge fits into the opening. Mounting wedge	Fig 2
7	Remove front bumper.	Model 447.6/7 except code XM0 (Facelift) except code XM7 (MOPF II)	AR88.20-S-2000E
8	Remove screw (11) and remove right horn (H2) as far as possible until the electrical connector (12) is accessible.	Model 447.8, 448 except code XM0 (Facelift) except code XM7 (MOPF II)
9	Disconnect electrical connector (12) and remove right horn (H2).	Model 447.8, 448 except code XM0 (Facelift) except code XM7 (MOPF II)
10	Remove screw (14) and remove left horn (H2/1) as far as possible until the electrical connector (13) is accessible.
11	Disconnect electrical connector (13) and remove left horn (H2/1).
12	Install in the reverse order.
	Check
13.1	Perform function check on left horn (H2).	Model 447.6/7 except code XM0 (Facelift) except code XM7 (MOPF II)
13.2	Perform function check on left horn (H2) and right horn (H2/1).	Model 447.8, 448 except code XM0 (Facelift) except code XM7 (MOPF II)

Fig 2: Identifying Mounting Wedge (110 589 03 59 00)

Courtesy of MERCEDES-BENZ USA