FM Modulator grounding problem

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parody

Member - Posts: 4

Joined: January 16, 2003

Location: United States

Posted: June 12, 2003 at 5:42 AM / IP Logged

Hi All,

I installed a (Pyramid?) fm modulator in my Toyota Sienna, to get audio input from a dvd. I noticed that I was getting a high pitched whine when the engine was on, so I assumed I had a grounding problem.

I tapped into power from an auxiliary 12v jack, and grounded to a bare metal portion of the body. As I was fiddling around with it, I deliberately cut the ground wire, expecting the FM modulator to stop working. However, it did not!

It's obviously grounding thru the antenna wire. Is this FM modulator defective -- it's not supposed to work this way, right????

Thanks!

esmith69

Gold - Posts: 1,511

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Joined: November 26, 2002

Location: United States

Posted: June 12, 2003 at 8:15 AM / IP Logged

Actually it is supposed to work that way, but usually you need a better ground than just the one in the antenna. After cutting the grounding wire, are you still getting the high pitched whining sound? What year is the sienna, and have you tried one of these antenna noise filters?

Finally, does the pitch of the whining sound change along with the engine RPMs? Or does it stay constant the whole time?

Ethan

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"Patience, persistence, and perspiration make an unbeatable combination for success"

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parody

Member - Posts: 4

Joined: January 16, 2003

Location: United States

Posted: June 12, 2003 at 10:27 AM / IP Logged

esmith69 wrote:

Finally, does the pitch of the whining sound change along with the engine RPMs? Or does it stay constant the whole time?

Yes, it the whining sound changes with RPM's. It's a 2003 Sienna. I haven't tried an antenna noise filter.

I had my wife pick up one of these:

Ground loop Isolator

We'll see if that makes any difference. Otherwise, try a noise filter?

esmith69

Gold - Posts: 1,511

Joined: November 26, 2002

Location: United States

Posted: June 12, 2003 at 11:19 AM / IP Logged

The ground loop isolator could very well fix your problem. If not, also make sure the head unit has a good ground connection. And then the next step if it's still getting the noise would be to try one of these alternator whine noise filters.

Ethan

-----

"Patience, persistence, and perspiration make an unbeatable combination for success"

Donate to the12volt.com

parody

Member - Posts: 4

Joined: January 16, 2003

Location: United States

Posted: June 13, 2003 at 6:17 AM / IP Logged

esmith69 wrote:

Yes, the ground loop isolator solved the problem -- no more whine!

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FM Modulator grounding problem

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