Retrofitting navigation processor in trunk - AN82.85-P-0001-01TTZ

On vehicles without Trailer hitch (Code 550)
- Undo nut (1) from bracket of rear SAM control unit with fuse and relay module.
- Fit bracket (2) onto stud and fasten in place using nuts (1).
  
  Fig 1: Identifying Bracket And Nut
  Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
All vehicles
Push navigation processor (N41/1) into control unit bracket (4) until the catches can be heard to engage (see arrow and detail).

Fig 2: Locating Navigation Processor Catches
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fit control unit bracket (4) with navigation processor (N41/1) on guides (see arrows) of bracket for rear SAM control unit with fuse and relay module (N10/2).

Fig 3: Locating Guides Of Bracket For Rear SAM Control Unit With Fuse And Relay Module
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Connect the navigation processor coupling (12), MOST coupling (8) and GPS navigation processor coupling (9) to the navigation processor (N41/1).
The connectors are coded to prevent misconnection.

Fig 4: Identifying Navigation Processor Coupling, MOST Coupling And GPS Navigation Processor Coupling
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Push control unit bracket (4) with navigation processor (N41/1) into guide for bracket (2) as far as the stop.
Fasten control unit bracket (4) onto bracket (2) using bolt (5).

Fig 5: Identifying Navigation Processor, Control Unit Bracket & Bolt
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.