Communications Control Module: Service and Repair

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





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

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

- Via Diagnosis and Information System (DIS):

- Service functions

- Start subsequent assessment

Replacement with option SA633/SA638/SA639:
- If necessary, carry out coupling procedure

- Remove sticker (Bluetooth passkey) from front of TCU and stick to Service Booklet insert





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





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

- Remove luggage compartment wheel arch trim on left





Disconnect antenna plug (1).
Disconnect plug connection (3).
Release nuts (4) and remove TCU (2).

Installation Note:
Observe color coding of aerial/antenna plugs (1).