vidlev

I recently purchased a used '98 LS400. The car originally came with air suspension, but according to its maintenance history the air system was replaced by lexus in favor of a traditional shock/struts a few years back.

Now, sometimes when I start the car, I hear a low hum of an electric motor. If I flip the air suspension switch on the center console the sound goes away. After a few seconds the hum comes back, and I can flip the switch again to turn it off. The response of flipping the switch and stopping the hum is instant. There is definitely a direct correlation.

After driving down the street for a block or two I don't notice the hum noise anymore. Sometimes after not hearing the humming upon startup, I pull up to a stop sign and the hum noise starts.

My question is, what is causing the hum noise and is there a way to permanently shut it off? It's annoying to have to deal with the extra noise almost everytime I turn the key. I've attached a video that will hopefully help to make my issue clear.

Yamae

The dealer didn't do a good job.
Check the fuse "40A H/CTRL" behind the battery. You don't need it any more.
There is one more fuse to remove under the dash. I don't know how it is named in English but it must be named "15A Air Suspension" or something.

Those 2 fuses should be removed otherwise the pump motor works as well as messages related to air suspension appear.

vidlev

thanks Yamae! Just removed both of those fuses. will report back if the issue is resolved or not.