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) (2003-2006): Design: GPS
The data transmitted from the GPS unit consists of signals received from GPS satellites.
The GPS unit transmits the signal to the multimedia module (MMM) via the MOST network.
The navigation system requires at least three satellites in order calculate the position of the car. The position calculated from the GPS satellites is accurate to within 25 meters.
The power supply to the GPS unit is from the antenna module (ATM).
The GPS unit is integrated with the antenna module (ATM) and transmits signals via the MOST network.
If the GPS signal is being diagnosed because it is missing, the signal should be tested outdoors. This is because the signal may be blocked if the vehicle is indoors.
Use the Manual With the Right Hardware
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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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