I pulled the wires out of one of the rear sensors and got the light - unfortunately you can only get the rear sensors as a pair and of course very expensive - ~$400. I would unplug and replug each sensor connector as I have had a loose front one that would randomly throw the light due to vibration.
The VX Workshop manual (downloadable on my site) has great troubleshooting steps / flow charts for most all of the systems on the vehicle. There is also a paper Electrical Troubleshooting Manual I got from Isuzu that has been extremely helpful - pdf of ABS system attached and I've emailed you the component location page that did not scan properly.
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