Communications Control Module: Service and Repair

84 11 660 - Removing and installing/replacing telematic control unit (TCU) (option SA633/SA638/SA639/SA664)





Important!
Replacement with option SA638/SA664:
- Carry out vehicle programming/coding Programming and Relearning

- If necessary, carry out coupling procedure

Replacement with option SA633/SA639:
- Carry out vehicle programming/coding Programming and Relearning

- Via Diagnosis and Information System (DIS):

- Service functions

- Start subsequent assessment





Important!
Read and comply with notes on protection against electrostatic damage (ESD protection) 61 35 ... Notes on ESD Protection (Electro Static Discharge).





Note:
Comply with notes and instructions on handling optical waveguides 61 00 ... Notes on Handling Optical Fibers.





Necessary preliminary tasks:
- Disconnect battery negative lead Disconnecting and Connecting Battery Negative Lead

- Remove backrest for rear seat Removing and Installing/Replacing Backrest





Disconnect plug connections (1) and (3).
Release nuts (2) and place holder (4) to one side.
Remove telematic control unit (5).

Installation Note:
Make sure wiring harnesses are correctly routed.