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Notes on control unit replacement > < Overall layout of telematics system

A3 Mk1

Removing and installing telephone/telematics control unitJ526
Removing and installing telephone/telematics control unit -J526-
If control unit is defective (unit replacement), a new emergency battery must be installed together with new unit.
This is not necessary if only the SIM card is replaced.
–  Switch off all electrical equipment.
–  Remove ignition key.
Removing:
–  Activate control unit service mode → Chapter.
–  Remove right luggage compartment side trim → General body repairs, Interior; Rep. Gr.70.
–  Unplug connectors at control unit.
   
–  Unfasten nuts -1- (5 Nm) and detach control unit from holder.
–  Take out telematics SIM card → Chapter.
  Note!
Leave telematics SIM card in control unit in vehicle.
Installing:
–  Install accordingly in reverse order of removal.
–  Fit new emergency battery (unit replacement only) → Chapter.
–  Deactivate control unit service mode → Chapter.
–  Perform initialisation → Chapter.
  A91-0561

Notes on control unit replacement > < Overall layout of telematics system