Remove/Install Armrest Heater Control Unit - AR54.21-P-0045FR

Model 257 

with code 906 (Front armrest heater) 

Courtesy of MERCEDES-BENZ USA

Shown on model 257 with code 810 (Sound system) and code B63 (Sporty engine sound) and code 489 (AIR BODY CONTROL) and code 881 (Remote trunk closing) 

Courtesy of MERCEDES-BENZ USA

	Risk of injury  caused by fingers being jammed or pinched when removing, installing or aligning hoods, doors, trunk lid/rear-end door or sliding roof.	No parts of the body or limbs should be within the operating area when the components are moving.	AS00.00-Z-0011-01A
Topical note	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Notes on HANDS-FREE ACCESS		AH80.61-P-0001-01A
	Remove/install
1	Perform commissioning of armrest heater control unit (N5)	When replacing the armrest heater control unit (N5).
			AD00.00-P-2000-06FR
2	Remove left luggage compartment lining at side	Model 257 with code 906 (Front armrest heater) except code 811 (Advanced sound system)	AR68.30-P-4800FR
3	Switch off ignition and store transmitter key outside of transmission range (min. 2 m)
4	Remove subwoofer from trunk	Model 257 with code 811 (Advanced sound system) with code 906 (Front armrest heater)	AR82.62-P-7841FR
5	Remove bolts (1), unscrew nuts (2) and remove bracket (3) with sound system control unit and place to one side	Model 257 with code 810 (Sound system) with code 906 (Front armrest heater) Model 257 with code 811 (Advanced sound system) with code 906 (Front armrest heater) Do not separate the electrical connectors.
6	Remove holder (4) with control units and place to one side	Model 257 with code 459 (Steel suspension with adjustable damping) with code 906 (Front armrest heater) Model 257 with code 489 (AIR BODY CONTROL) with code 906 (Front armrest heater) Model 257 with code 906 (Front armrest heater) with code B63 (Sporty engine sound) Do not separate the electrical connectors. The number of control units installed on the holder (4) can vary depending on the vehicle equipment installed.
7	Unscrew nut (6), remove bolts (5) and remove holder (7) with control units, then place to one side	Model 257 with code 489 (AIR BODY CONTROL) with code 906 (Front armrest heater) Model 257 with code 881 (Remote boot lid closing) with code 906 (Front armrest heater) Do not separate the electrical connectors. The number of control units installed on the holder (7) can vary depending on the vehicle equipment installed.
8	Release bolts (8), remove holder (9) with armrest heater control unit (N5) and place into vehicle
9	Disconnect electrical connector from armrest heating control unit (N5)
10	Unclip armrest heater control unit (N5) from holder (9) and remove
11	Install in the reverse order