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  #1  
Old 02-22-2015, 07:15 AM
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How long should the negative cable be disconnected

So that all the electronics reset?

I ask because after updating my Navteq maps, my Uconnect system is locked up. I don't even know if the updates worked. It only shows "updating maps". I've removed the update disc after letting them be read for several hours. Very frustrating.

This will be the first time I've disconnected the battery cable.

Dan

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  #2  
Old 02-22-2015, 08:23 AM
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Re: How long should the negative cable be disconnected

On this forum, people say about 30 minutes.
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Old 02-22-2015, 09:30 AM
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30 minutes or longger, thats not any type of official number but the idea is that you are not just pulling it off and immediately putting it right back on.
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Old 02-22-2015, 10:23 AM
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Re: How long should the negative cable be disconnected

When I had a flash update that resulted in the heater to turn on in 90 degree weather the service rep at first didn't have a clue. Then finally took it back to the bay and a FEW MINUTES later they rebooted it via the cable disconnect and all was fine. I don't know why some people are saying 30+ minutes is necessary...I'm not gonna argue with them as they may have their reasons, but I'd like to know what their reasons are (not being sarcastic, truly am curious as to why 30+ minutes may be needed)?
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Old 02-22-2015, 10:45 AM
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Re: How long should the negative cable be disconnected

Thanks guys.

After lifting up the battery compartment cover, I don't think I'm going to attempt to remove the negative cable. That cable post clamp is intimidating.

If you've done it, any tips and reassurance?
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Old 02-22-2015, 10:57 AM
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Quote:
Originally Posted by Dan JGC View Post
When I had a flash update that resulted in the heater to turn on in 90 degree weather the service rep at first didn't have a clue. Then finally took it back to the bay and a FEW MINUTES later they rebooted it via the cable disconnect and all was fine. I don't know why some people are saying 30+ minutes is necessary...I'm not gonna argue with them as they may have their reasons, but I'd like to know what their reasons are (not being sarcastic, truly am curious as to why 30+ minutes may be needed)?
It comes from the line of thought that some power can be temperarey retained in capacitors within modules. Leaving the cable off will allow that power to drain. It may work fine pulling it off and putting it on quicky or it might not. The 30 minutes thing is giving some extra time just making sure all power is purged. Pressing the brake pedal a few times also would help to drain off any risidual.
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Old 02-22-2015, 11:00 AM
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Quote:
Originally Posted by Lightninrod View Post
Thanks guys.

After lifting up the battery compartment cover, I don't think I'm going to attempt to remove the negative cable. That cable post clamp is intimidating.

If you've done it, any tips and reassurance?
Its not that bad just loosen the negative terminal with a 10mm, wiggle it back and forth and it will come off.
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Old 02-22-2015, 11:07 AM
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Re: How long should the negative cable be disconnected

^^^ I was guessing it was because of capacitors in the electronics. Once the negative is disconnected, perhaps pressing the start button (with the fob inside) may also help drain the capacitors. Having the doors open probably drains some of the capacitors in the systems too as it calls for energy for the lights.
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Old 02-22-2015, 11:12 AM
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Re: How long should the negative cable be disconnected

That's encouraging so I may try it.

I've worked on many of my vehicles over the last 45 years; starting with modifying my 1964 Corvair Spyder for autocrossing in the Florida Keys. But I've had to back off mechanical work lately. Still love talking about it and contemplating upgrading my JGC Overland.
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Old 02-22-2015, 01:04 PM
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Re: How long should the negative cable be disconnected

Stepping on the brake pedal drains the residual power as well...

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Old 02-22-2015, 04:45 PM
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Re: How long should the negative cable be disconnected

Quote:
Originally Posted by Lightninrod View Post
So that all the electronics reset?

I ask because after updating my Navteq maps, my Uconnect system is locked up. I don't even know if the updates worked. It only shows "updating maps". I've removed the update disc after letting them be read for several hours. Very frustrating.

This will be the first time I've disconnected the battery cable.

Dan
Question...
Why disconnect the battery cable for a radio reset?
Just locate the radio fuse (or fuses) and pull them for a couple minutes.
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Old 02-22-2015, 04:49 PM
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Re: How long should the negative cable be disconnected

Quote:
Originally Posted by Todd3.6 View Post
Question...
Why disconnect the battery cable for a radio reset?
Just locate the radio fuse (or fuses) and pull them for a couple minutes.
Thanks. I'm new to this vehicle. Where should I look? Under the hood or under the dash?
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