Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
TCB: Telematic Communication Box control unit basic version
The Telematic Communication Box (TCB) control unit basic version is connected to the CAN bus. It consists of a housing made of plastic. A battery compartment is integrated on the top side, which includes the emergency battery (see "EMERGENCY BATTERY ").
The following aerials are integrated into the TCB control unit basic version.
- GSM aerial
GSM stands for Global Standard for Mobile Communications. The GSM aerial is the telephone aerial for mobile phones. The GSM aerial is also used for data transfer by the telematics services.
- GPS aerial
GPS stands for Global Positioning System. The global positioning system (GPS) determines the position of the vehicle by taking a bearing from several satellites and measuring their signal propagation delays.
A SIM card is also permanently installed in the TCB control unit basic version. SIM stands for Subscriber Identity Module. The permanently installed SIM card enables registration in the GSM network.
| Item | Explanation |
|---|---|
| 1 | Telematic Communication Box (TCB) basic version |
| 2 | Cover of battery compartment |
| 3 | 18-pin plug connection |
The TCB control unit basic version is supplied with power by the Body Domain Controller (BDC), via terminal 30F.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.