It's not necessarily the Kenwood. BMW uses an odd system in their cars. There is the antenna, either on teh roof or in the rear window, that feeds analog to a receiver usually in the trunk that converts the signal into 2 wires. Analog and Digital. It uses a European antenna connection which requires an adaptor to interface our US Radios. So. It can be a couple of things that I've seen.
1. The adapter may not be perfectly nestled into the factory connection.
2. The adapter could be bad.
3. The car had an amplified signal processor built into the radio that amplified the antenna signal.
here are your possible solutions.
1. Check the Adapter and be sure it is plugged in properly. If it is still not working change it and try again.
2. If the adapter does not work, purchase a wired window-mount antenna and wire it thru your car. If you really want that kenwood, then you may have to compromise a little.
3. If neither works, then the only drawn conclusion would be the radio. Swap it and run thru the steps again.
There is not easy answer for this, it's troubleshooting stuff that has to be pin pointed. Good Luck!
FM reception is weak
What to do
• Extend the power cord as much as possible. The FM antenna is in the power cord.
• Move the power cord to adjust the FM antenna
• If you still have problems with FM reception, you may need an external antenna.
* Call Bose®Customer Service to request one.
The external antenna on your radio is a coax (round) design It needs an adaptor and an antenna which are cheap.
Easy to make, radio shack "F" connector 90 degrees or straight, to 300 ohm wire connections. Attatch a 300 ohm flat ribbon antenna cable to those two screws and plug into radio and see how your reception is. You will need to position the antenna wires to get best reception. I have hid them in back of paintings and so on.
Cheapest solution next to putting an extension cord on radio power cord.
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