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Right after spending $2,000 on engine work...(oil pump, timing belt, etc.) I was driving home and the Navigation clicked on and off... then the orange warning lists started... "Check Charging system"... then... "Check ABS"... "Check VSA"... then a big "pop" through the audio system and my Navigation came back on... but the radio went off... then the nav back off and then the warning lights again...

I have done some research... I took out and cleaned the Nav CD... still the light show... I pulled the Nav CD altogether... a little better...(not so frequent) but still happening. This has been going on now for 2-months.

I went back to the Dealer and they want to change out the ABS (computer)... for almost $2K. Seriously? The ABS? Someone else told me the Navigation has gone gunnysack... a $3K fix. Really? I'm at 97K miles... guessing it might be time to trade it in.

I have noticed one very interesting thing... it mainly happens when I TAKE MY FOOT OFF THE GAS!! When I go around a corner... the light show starts, when I slow down to take an exit... light show... and most of the time I get "Check Charging System". Checking with the Dealer... the previous owner had the Alternator replaced with an after-market unit. Could this be it? Looking online it looks there's really no issue with an after-market unit. However I had someone tell me that there are computer chips in the Acura Alternator that talk to the computers... if true, I'm guessing the after-market unit doesn't work the same way? Is this why I'm getting the check Charging System light? It can't talk to the computers? Thinking of getting an Acura or Honda alternator and installing it... cheaper than a new ABS or Nav system.

Anyone else with this problem that found a resolution? Thanks!
 

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Try checking your battery terminal connections. Especially the positive terminal. Give it a good tug up and a wiggle. With the way the harness pulls down, it can fool you into thinking the terminal is tight. This might sound dumb, but it can cause that problem. I speak from first hand experience. I would be driving and radio and rear entertainment would flicker and reset. Sometimes the transmission would act up. Other times I would get random error messages. Wouldn't act up until after about 15-20 minutes driving and not every time. Re-seated the terminal and car has been fine since.
 

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I'm still new to the MDX but on my other car when the alternator was on it's way out, it made the car do the same thing by displaying all kinds of errors because of the voltage drops and spikes. So the system to protect itself, will try to shut down certain modules to protect themselves and come back on when it reads a certain voltage.

One clue you mention is when taking your foot off the gas, that slows down the engine rpm which spins the alternator pulley, so that's an indicator it has something to do with the alternator and charging system
 

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I think you have a simple problem. Simple but a few hundred dollars. I think both your battery and alternator is shot.

Any general repair shop (I'm partial to Honda/Acura specialists) will be able to test your battery and charging system for free, and tell you with confidence which item is malfunctioning. If the alternator is not charging sufficiently, the battery may need to be charged through a charger first before testing.

Even retail-only stores like O'Reilly's, Autozone, Napa, etc will test your system for free. Probably makes sense to take it to a location which sells the brand of battery you like. If you are a AAA member, they'll come to you to test your vehicle, and have batteries to sell and install at your home, and they seem like quality, robust, and not cheap at all batteries.

If you are told the alternator is shot, I would rethink about another random off-brand unit. I recommend a rebuilt from an acura dealer, perhaps even an acura online dealer. Then have a Honda specialist install it for you.

A faulty alternator can fry your various computers and controllers before they are able to self-shut down and before the fuses can react. I've seen a blown fuse arc and continue transmitting electricity because the voltage was way beyond what the fuse was intended to handle.
 

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Discussion Starter #5
This is the obvious place to start! Thanks! I will give the battery terminals a try first... thanks!

The next step is then to have the battery and alternator checked out... another simple thing to try to see if that's the issue!

Went for a 3-hour drive yesterday and the Warning lights didn't happen once! Guessing that's because the air-conditioner was on, thus a constant pull on the system...

THANK YOU for your replies!!
 

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This is the obvious place to start! Thanks! I will give the battery terminals a try first... thanks!

The next step is then to have the battery and alternator checked out... another simple thing to try to see if that's the issue!

Went for a 3-hour drive yesterday and the Warning lights didn't happen once! Guessing that's because the air-conditioner was on, thus a constant pull on the system...

THANK YOU for your replies!!
Hello! This is an old thread, but worth a shot. My 07 MDX seems to be having the same exact issue, did you ever figure out what it was?
 
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