Question about 1998 Lexus Gs 400

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1998 GS 400 - Loud high pitch noise on the inside cabin

I have a GS400 and I was coming to a stop when I heard a loud high pitch noise coming from the front inside cabin. Initially I thought it was the radio and cut it off but it kept hissing. Finally after a few more seconds it stopped on it's own. Has anyone had this problem and what the heck could it be?

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  • charalynrena Jan 19, 2009

    It's a loud high pitch noise, almost like a radio signal trying to come in

  • charalynrena Jan 19, 2009

    The sound comes from the inside cabin always at low or no speeds. Today it continued for 5-10 seconds while I was holding on the brake. I opened the window and it did not appear as if the sound was coming from outside. The sound is never on long enough for me to open the hood to check.

  • hitechjunkie Apr 28, 2009

    Local oil change shop changed the cabin filter 3 weeks ago and a high pitch noise inside the cabin recently started. Started out as a high pitch noise, now its a low buzzing sound and only when the A/C is on. I suspect the A/C fan in the glove compartment area. Could it be something (loose screw) fell into the fan area and is in the way causing the fan to rub/buzz against it? How do I get there to tell?

  • gs400lover May 11, 2010

    was your A/C or heater on when you first heard it?

  • Jack Iaria
    Jack Iaria May 11, 2010

    Would you say the sound is electrical or mechanical?

  • Scott May 11, 2010

    you will have to provide more info in order for us to help diagnose this problem. try to take note of when exactly it occurs, try to find a pattern there and let us know, ty

  • Jack Iaria
    Jack Iaria May 11, 2010

    Is it a hissing or more like a scraping?


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Never had that problem with my GS400 but on my 95 maxima, i used to have that same high pitch squealing noise... i used some belt dressing that i got from R & S Strauss for a few dollars and sprayed it on my belts and pulleys that ran around the alternator, compressor, etc. and never heard the noise again. hope your problem is as simple and cheap to fix as mine was

Posted on Mar 08, 2009

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The first thing I would check is you emergency brake lever. Sometimes a coin or something will fall into the mechanism preventing you from releasing the e. brakes fully. Usually that buzzer means that the brakes are still on. If you're not having any other problems with the brakes, this is where I would look first.

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I have a 98 Lexus gs400 just got new battery and it ran fine all day now it has to be jumped to start it will not stay started nothing comes on and noticed loud noise coming from relay fuse box. And opened...

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Firing order diagram 1998 lexus gs400

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Locating the starter on 1998 Lexus GS400

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98 gs300 loud screeching noise that last for about 5-10 seconds

The only four rotating items under the hood are
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A/C compressor
and smog emission pump.
==== I would check the fluid level on the power steering first. Check for pink fluid leak on the ground,
==== Check the A/C system with the wheel turn to one side and APPLY ALL LOADS.
Example: high beam on,A/C max,radio on and deforster on.
This will give you system a stress test.
All eyes on the pully and locate to part that generate the loud screeching noise.
My bet is on the power steering pump.

Please post more info on the comment window.
I will follow up on it.

Feb 12, 2009 | 1998 Lexus Gs 400

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