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Sound System > < Removing and installing the mount for the mobile phone
Removing and installing the control unit for the mobile phone operating electronicsJ412
Removing and installing the control unit for the mobile phone operating electronics -J412-
The control unit for the mobile phone operating electronics -J412- is located below the right front seat.
  Note
as of CW 22.11, a Bluetooth module is integrated in the navigation system Amundsen which fulfills the function of the GSM II mobile phone pre-installation. On vehicles equipped with this navigation system and with the GSM II mobile phone pre-installation, the control unit for the mobile phone operating electronics -J412- is no longer installed separately as of CW 22.11.
Removing
–  Switch off all electrical components and take out the ignition key.
–  Push the right front seat completely towards the rear and the highest point.
   
–  Slightly raise the edges of the cover -arrows A- and pull out the cover -arrow B-.
GSM II up to CW 21.10
  S91-0181
–  Release screw -4- (6 Nm).
–  Slightly raise the bracket for the control unit -5--arrow A- and pull out the control unit -3--arrow B-.
–  Unlock by tilting out the clamp -2- and disconnect the plug connection -1-.
GSM II as of CW 22.10 and GSM III
  S91-0183
–  Release screws -arrows- (3 Nm).
  N91-10673
–  Press the catch -A- and disconnect the plug connection by tilting out the clamp -arrow B-.
–  Unlock the plug of the aerial cable -arrows- and detach.
Install
Installation is performed in the reverse order, pay attention to the following points:
–  When replacing, code the new control unit after the installation → Vehicle diagnostic tester.
  N91-10674

Sound System > < Removing and installing the mount for the mobile phone