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Discussion Starter #1
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

:eek:

thanks,
Cliff
 

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Discussion Starter #3
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:
125_2550.JPG

Cover removed:
125_2552.JPG

OnStar and GPS modules
125_2555.JPG

GPS Module with cover removed
125_2557.JPG

Anyone recognize these? They're in an early 2002 TB LTZ
 

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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. :sadcry:
 
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