Radio Noise When Rear Defrost Is On?

[Ornery]

I used my son's car today, and found the radio is useless with the rear defrost on. Guess I missed that after installing the radio last year. Of course, the antenna is in the rear window, so this noise isn't too surprising, but I must have left a filter off somewhere. Otherwise, this would be a really common problem... or is it?

 

[Zim Hosein]

What source did you tap the 12v lead to from the radio?

 

[Ornery]

Used the exact harness as the factory unit via adapter.

I'm searching for info online, but finding VERY little! I'm very surprised this isn't more common. Just my luck I guess...

 

[Zim Hosein]

Originally posted by: Ornery
Used the exact harness as the factory unit via adapter.

I'm searching for info online, but finding VERY little! I'm very surprised this isn't more common. Just my luck I guess...

I've done a few installs in my life both w/ and w/ out the adapters and I've never seen this issue either

 

[Kalvin00]

AM.....FM...or all the bands or what?

Maybe a short somewhere in the wiring?

 

[myusername]

Did you change any wiring or did you just do a straight swap of the HU?

 

[Ornery]

FM is the only thing I tried. It was basically just a straight swap. Replaced the orginal radio with an AIWA MP3 unit about 4 years ago. That was stolen last year, without hurting any wiring, and replaced with a Pioneer DEHP4600MP.

Hmmm, I'll have to play with it more tomorrow.

 

[Wuffsunie]

Hope you find a solution. Mine does it with a factory install. As soon as I hit the defrost, all but one or two stations becomes useless.