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Discussion Starter #1 (Edited)
2008 MDX turns off and back on while driving. I have a 2008 MDX Entertainment, Navigation and Power Lift Gate with about 98K. This has happened to me four times now. First three times happened while driving at a constant highway speed. To best describe this, while driving, shut off the ignition and turn it back on again very quickly, one time. That describes it perfectly except that no feeling of the engine shutting off experienced. Dash idiot lights come on and go off and my Navigation restarts as if I just started the truck but it now requires me to enter the unlock code to begin using it again. First 3 times no engine noise or stutter felt or heard. Seemed as though the issue affected only the cabin dash lights and Navigation. Last time it happened I was traveling down my street at about 30 MPH when it happened but this time it was shutting down and turning the engine back on along with the dash lights and Navi. Was a violent and jerking experience. Truck never stalled out completely, just felt like someone turned off and turning back on the ignition key for about 4 times in maybe 2 or 3 seconds in rapid succession while under slight acceleration. Transmission was making clunking sounds as well as the vehicle lunging the times it turned off and on. I have a 400 mile drive tomorrow so I am not only seeking advice as to what I may have to replace to repair this issue, but suggestions as to what I may be able to do to get back under way should this happen while on the road tomorrow disabling the vehicle during my trip. Any and all suggestions are helpful especially if that are received before my Monday 7/1/2019 trip. I know this sounds like a faulty ignition switch but I also know that it could be caused by something else, like a relay or something. Thank you all in advance.
Ray

UPDATE:

This just happened while parked in my driveway: Parked in driveway, opened both front windows all the way, opened rear tailgate using door switch, shut off engine, removed key and keyfob,closed D/S front door, opened and left 2 rear doors open. Loaded furniture in the back of the truck which took about 30 minutes while leaving all previously opened doors n windows open. Went to close tailgate with keyfob, NG, went to close tailgate with door button, NG, closed tailgate manually then full control resumed from both the keyfob and the door switch. Rolled up D/S window, OK, could not roll up P/S window from drivers door but could from passenger door and then full control resumed and was able to operate all windows from drivers side. Could not lock/unlock doors from drivers door and neither seat/steering wheel memory position responded until after I re-memorized the positions. Door locks began to work as well. Could somebody provide me with a link to the applicable wiring diagrams so I can troubleshoot this issue. Once I find the common denominator, I will be able to fix this highly intermittent problem.
 

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Discussion Starter #3
First of all: STOP DRIVING immediately and get it properly diagnosed. You do not want to get injured or die while trying to figure this out on a forum.
While I appreciate your concern, neither of what you mentioned will happen. Not only have I been a mechanic for many years, (although not in a professional capacity) I have been an owner and driver of race cars for most of my life. Even fortunate enough to spend some time in the Winston Cup Ranks (as it was called back in the day). I am fully aware of the stiffer than manual steering I would have without the P/S pump available should I loose engine power. Brakes will work as well as long as I have the reserve vacuum available. Again, thank you for your concern.
 

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Discussion Starter #6
Thanks for the replies. Since I re-positioned the positive battery terminal connection the problem disappeared. I believe I am going to have to look into the connections that go from the + battery terminal over to the fuse/relay box right next to the battery. May have corrosion there somewhere. Will update the post once I get into the cleaning of the connections.
 
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