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garmin GPS Vehicle charging cable?

2,292 52 July 24, 2019 at 08:46 PM
2017 Chevy Impala (rental car) - I plugged in my GPS and it thinks that its connected a computer - hence GPS didn't work.This is what GPS does when u plug it into your pc. I tried all three USB port - same result.

Seems like I need a power charging cable without Data Transfer option - where can I buy such a cable?

2017 Chevy Impala doesn't seem to have cigarette lighter port?

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#2
I hate to say it but I think you're only option is to hard wire something from the battery, through the firewall and into your car interior...

Pretty sure you need a 12V source (which is what a car cigarette lighter provides) for the Garmin to enter 'use' mode instead of 'charge' mode. The USB ports in your car are surely 2.4V max, probably more likely they are 0.5V...
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#3
Quote from ms2000
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2017 Chevy Impala (rental car) - I plugged in my GPS and it thinks that its connected a computer - hence GPS didn't work.This is what GPS does when u plug it into your pc. I tried all three USB port - same result.

Seems like I need a power charging cable without Data Transfer option - where can I buy such a cable?

2017 Chevy Impala doesn't seem to have cigarette lighter port?
You can use a data blocker device like this with any existing USB cable:
https://www.amazon.com/PortaPow-3...B00QRRZ2QM
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#4
Quote from jagojago
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You can use a data blocker device like this with any existing USB cable:
https://www.amazon.com/PortaPow-3...B00QRRZ2QM
I don't think that will work, but I'm only speculating. Have you actually used this with a GPS?

I think the issue is that the GPS doesn't enter GPS mode unless it recognizes a 12V connection. If that's the case, using the data block won't make any difference to the GPS, it will just prevent the car from thinking a data source was plugged in.
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#5
Quote from jagojago
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You can use a data blocker device like this with any existing USB cable:
https://www.amazon.com/PortaPow-3...B00QRRZ2QM
Should work - will try it out
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#6
I doubt there is much you can do except run off the navs internal battery and let it charge at every opportunity. Or invest in a phone mount and load up Waze.
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#7
Quote from ms2000
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Should work - will try it out
Garmin's vehicle cables are usually traffic or camera receivers, and AFAIK never simple USB cables, so IMO it isn't the data connection that is the problem, but rather what is missing from your cable.
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#8
Quote from ms2000
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Should work - will try it out
I highly doubt it, but if you do try it please post back and let us know the results. I always like learning something new, even if it means I've been proven wrong.
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#9
Quote from ChinaRider
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I think the issue is that the GPS doesn't enter GPS mode unless it recognizes a 12V connection. If that's the case, using the data block won't make any difference to the GPS, it will just prevent the car from thinking a data source was plugged in.
You're confusing volts and amps.

All USB connections (with the exception of USB-C PD) are 5v.

There may be a problem with data ports not supplying enough amperage (data ports are often 5v@500mA instead of 2.0-2.4A like many charging ports), but the most likely result would just be the GPS slowly draining its internal battery despite being plugged in.
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#10
Quote from FlashX83
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You're confusing volts and amps.

All USB connections (with the exception of USB-C PD) are 5v.

There may be a problem with data ports not supplying enough amperage (data ports are often 5v@500mA instead of 2.0-2.4A like many charging ports), but the most likely result would just be the GPS slowly draining its internal battery despite being plugged in.
No, I'm not confusing it (too many years of EE courses). Thank you for the clarification, though.

The difference is USB port vs. cigarette lighter. When the Garmin is powered from a cigarette lighter it recognizes a 12V input (or perhaps it's 10V?) and powers on into GPS mode.

When the Garmin is powered from a USB port, it recognizes a 5V input and powers on into charge mode. In this mode, a computer can access its data, etc., but it will not operate as a GPS.

I'm suggesting that the 'data block' connector that was proposed will not solve the problem as it's not providing the voltage required for GPS mode.

And after I've written this out, perhaps I am confusing the volts and amps and perhaps it's the amps that are recognized and dictate what state the GPS powers into. But either way, the argument is the same. And I'd truly like to know if the OP tries the proposed solution because one of the best ways to learn something is to be proven wrong.
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Last edited by ChinaRider July 29, 2019 at 07:10 AM.
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#11
Quote from ChinaRider
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The difference is USB port vs. cigarette lighter. When the Garmin is powered from a cigarette lighter it recognizes a 12V input (or perhaps it's 10V?) and powers on into GPS mode.

When the Garmin is powered from a USB port, it recognizes a 5V input and powers on into charge mode. In this mode, a computer can access its data, etc., but it will not operate as a GPS.
My assumption here is that the Garmin only has a USB port (like my old 1450LMT does) and always operates at 5v. There's no barrel connector or anything for it to receive 12v from the car.

Quote from ChinaRider
:
And after I've written this out, perhaps I am confusing the volts and amps and perhaps it's the amps that are recognized and dictate what state the GPS powers into. But either way, the argument is the same. And I'd truly like to know if the OP tries the proposed solution because one of the best ways to learn something is to be proven wrong.
Amperage would change based on how much power the device was actually using, the spec is just the max. Using that to dictate mode would be unpredictable at best.
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#12
Quote from FlashX83
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My assumption here is that the Garmin only has a USB port (like my old 1450LMT does) and always operates at 5v. There's no barrel connector or anything for it to receive 12v from the car.
Yes, that's certainly a possibility. Perhaps the cigarette lighter power cable has a transformer in it? If that's the case, then it must also have some sort of signalling device in it, as the Garmin will only enter GPS mode when powered through the cigarette lighter, not when powered via USB port. So something is obviously different and as you can tell, I don't know what that something is. One would think that if it was a signalling device that you could find a USB cable with the signalling device but they don't exist. Which is why I'm hoping the OP reports back.

I always assumed it was the voltage difference but you know what happens when I assume...
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Last edited by ChinaRider July 29, 2019 at 07:33 AM.
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#13
Not quite:
- I can use the wall phone charger adapter and a usb cable to both charge and simultaneously use the GPS.

GPS senses the data transfer options - if it does, then GPS is not usable.
With the wall phone charger does not have datacables' active - so it works.

One of my car has two USB ports - one connects to the radio other does not - it works on the other. Chevy Impala has all the USB connects to their radio I believe.

I did try with a power bank in the Impala - it worked for a while and then not - maybe the power bank is not good enough.
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#14
Interesting. I've plugged my Garmin in via USB cable and wall plug / USB and it will only charge. This is the early Nuvi 200 (old, old, old, but still works like a champ).

Sounds as if you are saying your Garmin model will enter GPS mode when plugged in via USB cable and wall plug.

If that's the case, and I were in your shoes, I would give the 'data blocker' that the other poster recommended a try. If I remember right it wasn't expensive...

Perhaps the new models of Garmin work differently than mine?
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#15
Good call on generic chargers. Also this can happen if you are using a power splitter, and I've also seen it when there was an electrical issue in the car.
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