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Remove/install front central operating unit - AR54.21-P-0500SX

MODEL 221.0/1 up to 31.5.09 except CODE (800) Model year 2010 

Fig 1: Identifying Front Central Operating Unit Remove/Install Components
G10127722Courtesy of MERCEDES-BENZ USA
REMOVINGINSTALLING Remove/install     
1.1 Temporarily store basic data from front central operating unit (A40/9) in STAR DIAGNOSIS When replacing the front central operating unit (A40/9).
INSTALLATION IMPORTANT Transfer the temporarily stored basic data to the new front central operating unit (A40/9).
 
REFER TO SELF-DIAGNOSTIC SYSTEMS Connect STAR DIAGNOSIS and read out fault memory   AD00.00-P-2000-04A
2 Switch off ignition and withdraw transmitter key or Keyless Go start/stop button from the EIS [EZS] control unit IMPORTANT Keyless Go start/stop button only for vehicles with code (889) Keyless Go.  
3 Remove turn/push control   AR54.21-P-0501SX 
4.1 Press release button (3) and lift armrest (1) towards the rear On vehicles without code (582) Rear air conditioning  
4.2 Press release button (2) and open telephone or stowage compartment (11) On vehicles with code (582) Rear air conditioning  
5 Unlock telephone or stowage compartment (11) using suitable tools through the openings (arrows) and lift towards the rear On vehicles with code (582) Rear air conditioning  
6 Unclip cover (14) from center console SPECIAL TOOL Fig 2
7 Close off stowage compartment ventilation via adjustment wheel (13) and unclip maintenance flap (7) using a suitable screwdriver (12) On vehicles without code (582) Rear air conditioning  
8 Expose wiring harness in center console and separate electrical connectors (8) IMPORTANT The number of electrical connectors (8) varies depending on the vehicle equipment.  
9 Remove trim at rear of center console   AR68.20-P-5169SX
10 Unclip hinge cover (5)    
11 Remove bolts (4, 6)    
12.1 Lift trim (10) at front, guide it backwards out of center console together with telephone or stowage compartment (11) and remove On vehicles without code (386) Preinstallation for telephone "Handy", UPCI system or without code (388) Telephone "Handy", UPCI system
INSTALLATION IMPORTANT Ensure that the wiring harness of the front central operating unit (A40/9) is correctly routed.
 
12.2 Lift trim (10) until the underside of the front central operating unit (A40/9) is accessible On vehicles with code (386) Preinstallation for telephone "Handy", UPCI system or with code (388) Telephone "Handy", UPCI system
INSTALLATION IMPORTANT Ensure that the wiring harness of the front central operating unit (A40/9) is correctly routed.
 
13 Remove bolts (9) and remove front central operating unit (A40/9) from trim (10)    
NOTES Information on preventing damage to electronic components due to electrostatic discharge   AH54.00-P-0001-01A
14 Install in the reverse order    
Fig 2: Identifying Mounting Wedge (110 589 03 59 00)
G07079389Courtesy of MERCEDES-BENZ USA