OnStar GPS - help identify and access in 2002 TB - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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  #1  
Old 10-04-2009, 03:06 PM
cliff42 cliff42 is offline
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2002 Chevy TrailBlazer LTZ
Red Metallic 4.2L I6 4X4
Join Date: Dec 2008
Location: Raleigh, NC
Posts: 2
Question OnStar GPS - help identify and access in 2002 TB

Hi all,
Can someone help me with a project? I have a 2002 TrailBlazer LTZ with the obsolete analog OnStar system. I have the unit sitting on my desk, but can't identify which model of the Motorola(?) GPS is in this vehicle. I've done internet searches on part numbers, but nothing comes up.

Can someone help me identify which unit this is, and help me find a way to access the GPS data? I will tie the data feed into a computer and/or a ham radio APRS system.

The various numbers on this unit are listed here:

OnStar + GPS package:
Motorola
Part NO: 12451224
Model NO: OSF1S14D10
STID (20S): 0002087304
TRACE (T): BV1224T211550814
FCC ID: IHDT5SZI EES
CANADA: 109 182 197A
TYPE: DNKA
ESN (22S): A84CBA6BBJT

Internal unit, sealed in metal shielding beneath main board with connectors.
(Is it GPS or the cellphone radio?)
Motorola
FCC ID: IHDT5ZY1 EE3
CANADA: 109 182 332A; TYPE ZYKA
SUN3007AC H9 191C02PL01



thanks,
Cliff
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  #2  
Old 10-04-2009, 03:29 PM
the roadie's Avatar
the roadie the roadie is offline
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2004 GMC Envoy SLT "Roadiemobile"
Extreme Offroad Pewter 4.2L I6 4X4
Join Date: Apr 2005
Posts: 26,181
Google for "hacking onstar gps". Lots of data. Pretty much doesn't care what kind of Moto module you have. Just snag the serial data.

http://www.openminds.net/onstar/

http://www.i-hacked.com/content/view/15/45/

http://members.cox.net/onstar/
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  #3  
Old 10-04-2009, 05:43 PM
cliff42 cliff42 is offline
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2002 Chevy TrailBlazer LTZ
Red Metallic 4.2L I6 4X4
Join Date: Dec 2008
Location: Raleigh, NC
Posts: 2
I've been to those sites and more. Yes, it's a simple matter to snag the data, as long as you know where to connect. There are at least two versions of the GPS units, the GT and the M12. Unfortunately, mine doesn't resemble either of them. The reason for this thread is to identify my GPS module and to get info on pin out diagrams and/or where I can tap the data lines and power the module. It would also be a big plus if I could power the GPS without powering the obsolete OnStar module. (I really hate the annoying "Check OnStar" message that it generates every few minutes.)


Combined unit:
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Cover removed:
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OnStar and GPS modules
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GPS Module with cover removed
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Anyone recognize these? They're in an early 2002 TB LTZ
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  #4  
Old 10-04-2009, 05:49 PM
the roadie's Avatar
the roadie the roadie is offline
No longer with us
 
2004 GMC Envoy SLT "Roadiemobile"
Extreme Offroad Pewter 4.2L I6 4X4
Join Date: Apr 2005
Posts: 26,181
Got a scope? Just poke about for RS-232 serial signalling? Trailvoy really isn't a hotbed of Onstar hacking enthusiasts, I'm afraid. Not many engineers, either.
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data, gps, motorola, onstar, wiring

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