i was having a similar issue turned out the NAV MAPS dvd that i dl'd and burned wasn't liked by my dvd player...

put the original disk in and it worked

so ij ust broke down and spent $100 and found a used navteq DVD for my system from 07 haven't had an issue since!

 

Let me see if I can find someone who knows about these things.

 

Ok, here is what I got back from my resource who knows the in's and outs of the Nav system. I hope this helps but from what I have copied and pasted below, the problem is most likely with the Nav computer and not the display.

It sounds more like an internal power
supply problem. Reason I say that is the fact that he can press and
hold the eject button and all is well. The system was designed to
power for 40 seconds with one eject button press, the second press
would then eject the CD. The was done so the key did not have to be
in the ignition. So I would guess that this problem is related to the
switched (key on) power inside the unit (since temperature changes the
cycle) rather than on the vehicle side.

Not sure on the vehicle, but the "key on" could be data.

 

power supply issue?

Thanks jstover

Aha - now this is what I've always suspected it to be. I suspected there was something 'special' about the eject button power. This is EXACTLY the kind of info I was hoping somebody would turn up.

In old cars (like my first cars back in the 80s and earlier for some), almost every electrical problem turned out to be a bad ground. Basically, the connection between the ground and the body would corrode over time and give a patch connection. Amusingly enough, a sharp knock (though not with a hammer) would often make a faulty brake light start working again.

So I figure it could be something similar with the GPS. That might explain the temperature variants. However, unless it's something in the purple or blue plugs it might be something on the PCB inside the unit itself since bringing it to room temperature seems to fix it sometimes (but that could also be coincidence).

When you say "key on" related, I guess it's also possible that this could be related to a dodgy connection on the iBus...do you think?

So has your friend managed to fix this? If so, how?

 

xxpanipuri - are you saying you saw these exact same symptoms? I don't *think* it's disc related because it does this with original CDs/DVDs as well (my old MK3 did the exact same thing as my MK4) and it also does the exact same thing with the disc out. Of course it asks for a map disc if it manages to boot, but the reboot cycle is just the same.

 

No. The problem is not the disc. Please read his reply again. It has something to do with the Nav Computer internal power supply and possibly with the "switched power circuit" inside the computer. The computer is connected to a constant voltage in order to insert or eject the disc with the ignition "off" but there is also a switched circuit which tells it to turn on when the key is "on". Because you have power at the computer, the problem with yours is most likely the "switched power" inside the Nav computer.

If you havent done so already, I will recommend doing a little investigative work yourself and find the pin-out for the power plug coming into the computer. Make sure you have constant and switched power in the right places as well as ground. If you have power and ground where you are supposed to, its an internal problem and the unit should be replaced or repaired.