20 Most Recent 1999 Lexus LS 400 Questions & Answers

https://www.allcarmanuals.com/factory-service-manual-103-Lexus-LS400-XF10-XF20.html

Doubtful it's an intermittent electrical problem. Far more likely you've got a wheel speed sensor issue. Since VSC gets all it's information from the ABS system, start by pulling the trouble codes. I bet you'll see an ABS code. Read this post ABS What are ABS brakes Ricks Free Auto Repair Advice

There's a short in a wire. Its touching a ground to make it cut on and off.

Level sensor failing, replace

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Fuse bank should be in a black box under the hood in the engine compartment, usually its close to the battery.

Check catalytic converter. Maybe clogged or chaned

I had a similar problem in a GMC truck. After being stumped by the console fastener system, I used a flexible camera to locate the dropped item and a "fishing tool" to remove it.