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: Read and comply with notes on protection against electrostatic damage (ESD protection). See 61 35... NOTES ON ESD PROTECTION (ELECTRO STATIC DISCHARGE)
.

NOTE: Follow instructions for handling fibre optic cables.

Necessary preliminary tasks:

Disconnect battery negative lead
Remove luggage compartment wheel arch trim on left . See 51 47 151 REMOVING AND INSTALLING/REPLACING LEFT LUGGAGE COMPARTMENT WHEEL ARCH TRIM .

Unlock plug connections (1) and (2) and disconnect.

Unfasten antenna plug (3) and disconnect.

Release nuts (4) and remove TCU (5).

Installation:

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

Fig 1: Identifying Plug Connections, Antenna Plug And Nuts

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