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Remove/Install Electric Liftgate Control Unit - AR72.29-P-0003LWX

Model 253.3 

with code 890 (EASY-PACK-tailgate) 

Fig 1: Tailgate Control, Control Unit Components Location - Model 253.3 with code 890 (EASY-PACK-tailgate)
G12941122NOTESIMPORTANTREMOVINGINSTALLINGREFER TO SELF-DIAGNOSTIC SYSTEMSINSTALLATION IMPORTANTREFER TO SELF-DIAGNOSTIC SYSTEMSCourtesy 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
NOTES Information on preventing damage to electronic components due to electrostatic discharge   AH54.00-P-0001-01A
IMPORTANT Notes on sensor system for trunk lid opening/closing Model 253.3
with code 871 (HANDS-FREE ACCESS)
with code 889 (KEYLESS-GO)
with code 890 (EASY-PACK-tailgate)
AH80.61-P-0001-01A
REMOVINGINSTALLING Remove/install     
1 Perform initial startup for liftgate control unit (N121/1) When replacing liftgate control unit (N121/1).  
REFER TO SELF-DIAGNOSTIC SYSTEMS     AD00.00-P-2000-04B
2 Remove center liftgate paneling   AR72.20-P-6618LWS 
3 Unscrew nut (1)    
4 Disconnect electrical connectors (2) and remove liftgate roof control unit (N121/1) INSTALLATION IMPORTANT : Ensure that guides (3) are seated correctly in liftgate.  
5 Install in the reverse order    
6 Normalize liftgate control trunk lid drive unit with diagnostic system When replacing liftgate control unit (N121/1).  
REFER TO SELF-DIAGNOSTIC SYSTEMS     AD00.00-P-2000-04B