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11-26-2006, 07:36 PM | #1 |
Drives: 07 Yaris Sedan Join Date: Nov 2006
Location: NC
Posts: 37
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No AM radio signal on two aftermarket HUs?
I've tried two different model Alpine HUs in my 07 sedan, and have noticed in both cases that AM radio reception is pretty much non-existent. FM radio comes in strong/fine, so I don't think it's a case of a bad windshield antenna connection to the radio.
I originally had the "integrated" AM/FM/CD stereo in the car. I'm almost starting to wonder if the factory radio had a built-in AM loop antenna or something like that, instead of it using the windshield antenna? The only other thing I can think of is maybe there's a separate feed for the AM antenna on the wiring harness that I wasn't aware of. Not having AM isn't a huge deal...99.995% of the time I'm listening to either XM or the iPod, but in my area there are some decent AM news stations that I listen to every once and a while. Has anyone else had an issue with AM (or even tried to listen to AM) after replacing their stock HU? |
11-26-2006, 08:18 PM | #2 |
Drives: 07 Yaris Sedan Join Date: Nov 2006
Location: RI, USA
Posts: 25
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Antenna
The antenna is in the rear glass. It is a powered antenna, and there is fair FM reception when unpowered. It could be that the current capability of the Alpine power antenna wire is too low. You may wish to try connecting the Yaris power antenna lead (Socket A pin 8) to the accessory lead (Socket A pin 3) instead of to the alpine blue wire. If your AM reception comes back, you may either leave it as is, or have the alpine turn on a relay to connect battery power to the antenna.
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11-28-2006, 08:18 PM | #3 |
Drives: 07 Yaris Sedan Join Date: Nov 2006
Location: NC
Posts: 37
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Ah...I didn't realize it was a powered antenna. My strong guess is that the power lead for the antenna isn't connected at all. FM reception is pretty good, so that much certainly bodes well with your theory. I'll have to yank the HU & check out the wiring...sounds like an easy fix.
Thanks for the info...I would have never guessed it was a powered antenna! |
11-30-2006, 11:23 AM | #4 |
Drives: 07 Yaris Hatch 5speed Join Date: Nov 2006
Location: BC, Canada
Posts: 146
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Does anybody know if the hatchback(liftback) also has a powered antenna? I don't get any AM reception in my car with an aftermarket deck.
If it has a powered antenna, which coloured(colored) wire on the Scosche wiring adaptor do I connect the powered antenna wire from my deck to? Thanks, earljail |
11-30-2006, 12:16 PM | #5 | |
Drives: 2007 Yaris Liftback Join Date: Apr 2006
Location: United States
Posts: 18
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Quote:
The hatch antenna is powered. How do we all know if we connected the wires correctly for the amplifier on the antenna to work? |
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12-01-2006, 09:07 AM | #6 |
Drives: Yaris HB 2007 Join Date: Jun 2006
Location: Quebec, Canada
Posts: 22
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I have the exact issue with my HB and Alpine Head Unit with FM reception
didn't try AM... What do the power antenna change to the FM reception? And btw, my reception was VERY good with my Toyota Heand Unit... I tought the power antenna cable was for the antennas which go up and go down all alone.... |
12-01-2006, 11:08 AM | #7 | |
Drives: 2007 Yaris Liftback Join Date: Apr 2006
Location: United States
Posts: 18
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Quote:
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12-01-2006, 10:51 PM | #8 |
Drives: Yaris HB 2007 Join Date: Jun 2006
Location: Quebec, Canada
Posts: 22
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12-01-2006, 11:11 PM | #9 |
Drives: 07 Yaris Sedan Join Date: Nov 2006
Location: NC
Posts: 37
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Yes, powering the in-glass antenna now provides me with AM reception (as opposed to no AM reception) & improved FM reception!
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12-04-2006, 03:21 PM | #10 |
Drives: 2007 Yaris Liftback Join Date: Sep 2006
Location: Chicago
Posts: 129
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Does anybody know how much current the antenna amplifier draws? The wire for a power antenna (motorized) or an external amplifier (on/off) on my head unit states 300mV max.
I have AM reception but it sucks. I too have made the mistake of not supplying power to the antenna amplifier. |
12-04-2006, 11:29 PM | #11 |
Drives: 07 Yaris Sedan Join Date: Nov 2006
Location: RI, USA
Posts: 25
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I think the scoche adapter power antenna lead is blue....it might be blue with a white stripe
I *think* the antenna amplifier draws about an amp, but I'm not sure. I didn't measure it. I do know that Yaris sedan's glass antenna is one of the best in the industry, beating antennas in cars most of us could only dream of owning... |
12-05-2006, 07:33 AM | #12 |
Drives: 2007 Yaris Liftback Join Date: Sep 2006
Location: Chicago
Posts: 129
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12-07-2006, 03:49 AM | #13 |
Drives: 07 Meteorite Metallic Yaris LB Join Date: Jul 2006
Location: USA
Posts: 441
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Well at least Toyota doesn't use something like Nissan's Diversity Antenna... I have a rear-window printed antenna AND a power post type antenna, apparently the head unit decides which one is getting the best reception and switches, it's a real nice headache for aftermarket, as if my car's built in Bose Audio system's balanced-line signal output and odd impedences weren't bad enough.
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07-25-2012, 09:45 AM | #14 |
Drives: Yaris Hatch yr 2011 Join Date: Jul 2012
Location: Aus
Posts: 3
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Barryware,
which wire did you connect to for the power antenna for the AM signal? |
07-25-2012, 12:56 PM | #15 | |
Drives: 2007 Yaris Liftback Join Date: Sep 2006
Location: Chicago
Posts: 129
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Quote:
Using the harness I bought for my head unit.. I connected the wire to power the rf amp to the switched 12v wire to the head unit. So.. when ever I turn on the ignition, the rf amp powers up. |
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11-24-2012, 07:32 PM | #16 |
Drives: 2008 HB, A/T, Power W/L/M Join Date: Oct 2008
Location: LI, New Yawk
Posts: 2,063
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Hmmm.. I'm experiencing the same misery with a 2013 Tc deck in my '08 hatch. No AM! as a talk radio fan I need it...
The 2013 deck needs an adapter cable to work on the '08 antenna plug. There is a powered wire for the antenna coming from the antenna adapter. So which color harness wire would I need to tap into to juice up my OEM antenna then? Can I just use a squeeze on wire tap instead of cutting?
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Never take eyes off opponent - Bruce Lee |
07-23-2013, 06:33 PM | #17 |
Drives: 2005 Vitz RS, NCP91, Manual Join Date: Jun 2013
Location: Wellington, New Zealand
Posts: 34
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I'm having similar problems and have written about it in this thread.
http://www.yarisworld.com/forums/showthread.php?t=46256 If anybody has a solution please let me know. Cheers |
05-25-2014, 03:20 PM | #18 | |
I've made a post!
Drives: 2007 Yaris sedan Join Date: May 2014
Location: Michigan
Posts: 1
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Quote:
Scosche Radio Wiring Harness for 1987-Up Toyota Power/4 Speaker Connector to Kenwood Excelon KDC-X598 CD Receiver I was having radio reception issues and connected the Blue wire on the Sc osche connector to the White/Blue wire on the Kenwood. As soon as I powered on the unit my AM reception was working and the FM signal was strong. The original radio was the factory integrate mode. It fried about a week ago. I did a bunch of Googling to see what I could replace it with. That's when I found this site. After using the Search function (yes I actually used it) I was able to install the new radio quite easily. This last little glitch with the reception was the last outstanding issue. I did solder all my wires and heat shrank them rather than use crimp connectors. I should note that I worked on avionics in the Air Force (B-52's and KC-135's) and have no fear of soldering and a working knowledge of wiring diagrams. Thanks to everyone on Yaris World for your posts!!! |
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