No AM radio signal on two aftermarket HUs?

[enkid]

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.

[atebit]

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!

[earljail]

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

[redbluff]

Originally Posted by earljail

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

Same issue for me. Very poor AM recepton on the hatch back and not real good FM. Using an aftermarket radio. Called while it was under warranty and had them send me a new one. Put it in and does the exact same thing.

The hatch antenna is powered. How do we all know if we connected the wires correctly for the amplifier on the antenna to work?

[jbll]

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....

[redbluff]

Originally Posted by jbll

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....

The antenna is amplified to boost the signal. I only guess that we dont have the non stock units connected up right.

[jbll]

Originally Posted by redbluff

The antenna is amplified to boost the signal. I only guess that we dont have the non stock units connected up right.

so, if i change the wire, I will get a better reception???

[bobdawonderweasel]

Originally Posted by enkid

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.

Confirmed on a 2007 Yaris sedan that the antenna amp needs power.

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!!!