reggiek945

I just wanted you guys to know that I have just tried this and it works great. I'm not even a good at soldering and it came out better than I thought. I recommend this to anyone who has onstar and want to use the gps.


http://openminds.net/onstar/

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pimpJ

wow, looks interesting

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WakeBdr

Just make sure you have the correct Onstar hardware. I have a 2003 Tahoe that has a different board in it. The 2003+ models have different hardware and cannot be hacked using this mod.

reggiek945

Thanks for the heads up WakeBdr.

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Question

Wow, awesome find reggie.

blaster

OMG, why people pay for "OnStar" and then for subscription?

Leddy

This has been around for a while and it's great.
I used http://members.cox.net/onstar which I believe was the "founder" of this mod.

I friend my converter somehow and still need to order another

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cash_Money

Correct me if I'm wrong but there is a seperate GPS network for military uses. Does anyone remember several years ago when they made WAAS freely availble to the public?

Isn't the EU and China building their own GPS network?

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grepzen

No, same network for mil and pub use. The mil has access to more signals that provide greater accuracy.

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Peoples

How would you go about figuring out that you just need to solder these 4 pins to your serial port?....thats crazy? Do these guys work for onstar?

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TaylorMade

Just got a 2K1 Denali and had to pull the carputer out of the jeep, but wasn't able to remove the GPS mouse from the roof... put it on too well, damn adhesive. I'll DEFINITELY be giving this thing a whirl.

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Dudes99

LAT/LONG + HEIGHT!!! Sweet for using as aimpoints for PGM's.

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SnyperBob

Nice information guys. Thanks for the links, I will be sure to look further into this

Saab9-5

OnStar started its switchover in 2002 so some cars have the correct modules and some don't. The easiest way to tell is if there are two boxes - one is the computer, the other is the cellphone used by OnStar. The newer modules are a single box with the GPS and cellphone integrated into the circuit board.


No, some people just enjoy hacking stuff apart to figure out how it works. Reverse engineering can be fun sometimes.

The GPS module used inside the older OnStar boxes is actually a Motorola GT Plus OnCore GPS receiver. Details are here - http://www.motorola.com/ies/GPS/products_legacy.html. I pulled the OnCore module out of an old OnStar unit I got from the junkyard and used a modified version of the first circuit on this site - http://neutrino.phys.washington.edu/~berns/K2K/TACGPS/ - to build an RS232 serial interface for the board. Its been working great ever since. I can post the modified schematic if anyone is interested.

TaylorMade

I haven't been able to start this little venture yet, but it IS intriguing me more and more every day. I do have a question, though. In the 2001 Yukon, is the GPS antenna above the rear view mirror? And if so, how is the reception??? I know I had fits with my GPS antenna being inside my last car, so I moved it to the roof where it worked great. Next stop is finding the box to hack away!

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