Answer
Nov 12, 2025 - 04:15 PM
The radio antenna on the ’04 ML350 (W163) is separate — it’s only used for AM/FM reception. It doesn’t handle GPS or phone stuff.
Here’s the breakdown:
- Stereo antenna: built into the rear side glass or tailgate glass (depending on option). It’s just for the radio.
- GPS antenna: small puck or pad under the dash top or in the rear roof area if the car has factory navigation.
- Telematics/phone antenna: a separate unit, usually mounted on the roof near the rear (that shark-fin or stubby antenna).
So if you’re missing the rear antenna, that’ll only kill your radio reception. It won’t cause your nav or communication system to stop talking. Your nav being stuck in Utah means the GPS antenna/module isn’t getting signal — either the GPS antenna’s disconnected, its coax cable’s broken, or the nav unit itself lost satellite lock.
If both the GPS and the “service/communication” systems are dead, I’d check the roof antenna base or the nav signal cable behind the COMAND unit first — water intrusion in those connections is pretty common on these.
