Quote:
Originally Posted by Wiseguy813
Thanks. I gave it a look and both ends of the grommet look good. Would it be wiring if all the components work just fine when the engine isn't running?
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It does sound like something wiring related has flaked out. Have you looked closely at your fuse panel for anything out of the ordinary like a blown fuse, burn marks or scoring, melted wiring or plastic? Same for behind the dash window switch. I'd even go so far as to remove kick plates and door sill trim to visually inspect any wiring going to the back. If everything works properly with just ACC ON then nothing after you roll on the ignition then it's reasonable to assume that one or more electrical components like a relay or sys diagnostic coming online is failing somewhere and faulting the system. Is the computer throwing any codes?
Check the ECU-B 10A Fuse
Have you taken on water anywhere? i.e. the hatch which can get clogged drain holes much like the sunroof. A-pillar (drivers side) water leaks from a clogged sunroof drain is common. That water may not drip where you see it right away but it can definitely find its way behind the dash and down the firewall to where all your moisture sensitive fuses, wiring, and electrical connectors are. I had this problem with my 4th gen and it caused the horn to start blasting randomly which was quite annoying.
I know that the hatch has a lot of things going on and its ECU is tied to the security system. The 4runners computer may have to relearn the setup when the negative cable is pulled or a major electrical component is changed out. Though, I've never run into this myself. The owner's manual has instructions on how to relearn the system.
Electrical issues are fun, ain't they? Good luck!