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.
Antenna Module (ATM)
The main function of the antenna module (ATM) is to handle the antenna signals for:
- AM/FM
- GPS (Global Positioning System), receiving position signals
- Traffic message channel (TMC), receiving traffic information.
The antenna module (ATM) consists of a thin film antenna and a receiver. There is a base unit which only has AM/FM reception. The control module can be upgraded with GPS and traffic message channel (TMC) units. The following types are available:
- base unit with only AM/FM-reception without the possibility of upgrading, for market codes EU and US
- base unit with only AM/FM-reception with the possibility of upgrading, for market codes EU and US
- base unit with only AM/FM-reception with the possibility of upgrading, for market code JP.
The control module is positioned in the rear of the roof. Detach the headlining in the passenger compartment if the control module is replaced.
The antenna module (ATM) uses serial communication on the MOST network to communicate with other control modules.
The control module checks activations and input and output signals via an integrated diagnostic system. A diagnostic trouble code (DTC) is stored if the control module detects a fault.
Any diagnostic trouble codes (DTCs) are stored in the control module memory. This information can be read off using VIDA via the data link connector (DLC) in the car.
If the antenna module (ATM) is not supplied with voltage communication on the MOST net does not function and the Infotainment system shuts down.
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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.
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