84 11 650 Removing and installing/replacing telematic control unit (TCU) (option SA633/SA638/SA639/SA664)

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IMPORTANT: Replacement with option SA638/SA664:

Carry out programming/coding
If necessary, carry out coupling procedure

Replacement with option SA633/SA639:

Carry out programming/coding
Via Diagnosis and Information System (DIS):
- Service functions
- Start subsequent assessment

IMPORTANT: Protect against electrostatic damage (ESD).

NOTE: Follow instructions for handling fibre optic cables. The minimum permitted bending radius is 25 mm. Do not subject optical fibers to compressive and tensile load. Protect optical fibers against the effects of heat (e.g. during welding work, drying work with infrared heater or hot air blower). Optical fibers are permitted to show only one junction point (bridge), replace optical fibers if necessary. The optical fibers are colored differently as follows: Green=MOST (Media Oriented Systems Transport) optical fibers. Yellow=ISIS (Intelligent Safety and Integration System) optical fibers.

Necessary preliminary tasks:

Disconnect battery negative lead
Remove backrest for rear seat . See 52 24 010 REMOVING AND INSTALLING / REPLACING BACKREST .

Disconnect plug connection (1).

Disconnect antenna plug (3).

Installation:

Observe color coding of aerial/antenna plugs (3).

Release nuts (2) and remove TCU (4).

Fig 1: Identifying Plug Connection, Antenna Plug And Nuts

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