4x4 not working

2006 TOYOTA SEQUOIA
170,000 MILES • 4.7L • V6 • 4WD • AUTOMATIC
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CVT
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  • 1 POST
4x4 worked fine until went on long road trip, using 4x4 a lot. at the end of the trip near home, I pressed the 4x4 switch on the dash and nothing happened. No dash lights, no 4x4. The switch just didn't work.

I let it sit for ten minutes at home and it worked again. I drove it in and out of 4wd with no problem until three days later. Again the switch didn't work. nothing happens when the button is pressed.

A while ago, same thing happened with my rear window wiper and defroster: stopped working then a few days later started working again.
Feb 19, 2019 at 8:22 PM
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SCGRANTURISMO
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Hello,

This could be a problem with loose or corroded ground. Ground 10 at right dash brace looks to ground all the circuits that are intermittently failing. I have included the wiring diagrams in the diagrams down below. Let us know what you find out.

Thanks,
Alex
2CarPros
Feb 19, 2019 at 10:12 PM