Thread: Garmin nuvi 3790v + ecoroute HD (OBD module)

Originally Posted by chadiln

Hi everyone,

I'm currently living here in Bangkok and recently found the Garmin ecoroute HD module at a local gadget shop. I decided to check with the sales person, but they didn't seem to have a clue as to what it did or if it supported my then Nuvi 3770T (a localized unit sold here in Thailand). So I decided to buy it anyway and try my luck in the Internet. Its a Garmin, and my Nuvi 3770T was only a year and a half old. Worth the risk, right? So I got home and after some searches at the Garmin website, it turns out that my Nuvi 3770T wasn't on the compatibility list. :rain:

Nevermind.... At least the compatibility list included some models from the 37xx series. Maybe it would work.

The ecoroute HD did a series of 3 quick flashes once plugged in to my car. My Nuvi showed no sign / menu to connect with the ecoroute HD.

So yesterday I went and bought the Nuvi 3790V here (the compatibility list included the 3790, but LMT and the T versions). I still got the same results from the 3790V, no menu. no dialog box. It does have ASR...

After further searches, it turns out that the US version of the 3790 are able to link to the ecoroute HD. So today after going through some of the tutorials here on this excellent forum, I was planning to flash the US version of 37xx firmware to my Nuvi. After some more reading, I decided to try the 34xx instead so I flashed the latest version of the 34xx on to my Asian firmware 3790V.

The 3790 (with 34xx firmware) starts up fine and everything seems to work ok. I am currently at work, so I didn't get the chance to try the ecoroute HD connection yet. The only thing missing seems to be the lack of a Thai keyboard.

The big problem is, when I wake/unlock the Nuvi (with 34xx firmware) from sleep mode, the display stays locked on "portrait mode" and will not switch to "landscape mode" like it used to. However, if I turn it off and turn it back on again, it will be in "landscape mode".

Has anyone experience this? Is there a fix to this?

Thanks,
Chad

Bad news.
1). Once you flash us fw into Thai unit ***and changed hwid ***then your 3790v Thai will be US unit and very hard to go back To be Thai unit again.
2). 3790v has eCompass while 34xx US has not. It means you will loss dual orientation mode. You will get this feature back if you can flash with eCompass firmware. All of Us/eu fw has no ecompass, but now you can not go to Asian .
3). Now you permanently loss Thai jcv.
4). You will permanently loss eCompass.

Good news.
You still get fm traffic via you original gtm35 but with 34xx features. You won't see the list of all traffic anymore.
- you will loss Thai Narisa. But you can get it back by firmware patching.
-***you can go back to 3790v Thai if now your hwid is still original.