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I'm trying to fix my girlfriend's reception problem in her 01 LX sedan but I can't seem to find the issue. The reception isn't completely lost, AM stations have a lot of static, and the closer FM stations come in OK, but can be finicky. There is only one station that comes in all the time. Based on multiple threads, it seems that the 2001 coupes have a separate antenna amp behind the c-pillar on the passenger's side. The sedans, based on only one other thread, may have that amp built into the head unit. So if you replace the head unit with one without that amp, you lose reception. She purchased her's used with an aftermarket JVC already installed (KD-G120). I can't find JVC documentation on that unit that shows it has an antenna amp.

Also, there is no continuity between the center plug on the coaxial cable (going into the HU) and where the wire connects to the metal plug on the back windshield. Every resistance setting on the omh meter shows this is an open circuit. Yet when it's connected I get some stations, when it's disconnected, I get nothing...so it has to be working somewhat. I traced out most of the cable from the back to the front and can't find any breaks.

Am I missing something with the diagnostics? Do I need to buy a HU with a built in antenna amp?

Thanks

 
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The diagram I see does not show an antenna amp in a 4 door car.

If you have an open circuit between the connector on the back of the radio and the glass, you have a problem.
There should be an antenna lead coupler somewhere around or behind the passengers kick panel. Make sure it hasn't been unplugged.

 
Rep Power: 291

i'd say you've done a good bit of research and troubleshooting already. from the resistance readings, if you're checking center pin to center pin and it's reading open, it would indicate to me that the antenna cable is broken somewhere. i had an 02 LX sedan and while the reception with an aftermarket HU wasn't quite as good as stock, it was still very good.

 
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Thanks for the replies. I guess I'll just keep looking for the break, starting with the passenger kick panel.

 
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I should have done this before, but I shoved one of the ohm meter leads into the back of the radio and like magic all of the stations started coming in, so I know this is an antenna issue and not a HU issue. Further troubleshooting, I found the main antenna cable has good continuity but the sub feeder cable shows an open, but I couldn't find any breaks. Looks like I'll be ordering one of those cables. Thanks again for the replies.