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Old 09-23-2011, 06:13 AM   #1
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How does one disconnect GM's OnStar?


My vehicle came OnStar enabled and free for one year. I found the service to be of no use to me and did not renew it after the free year. If one read the privacy statement of OnStar, it USED to say the information collected would be kept private. They have now changed it, indicating they will collect your base location, where you have been, your speed, seat belt use, and god only know what else is being recorded, AND will SELL the information. Even if you do not pay for the service, the vehicle is still collecting data and sending it to OnStar. Frankly, I don't really give a hoot what they know about me and my driving habits, however it galls me that more of the "big brother" effect is kicking in, and I really want nothing to do with it. How can I disconnect OnStar without any negative effect on the vehicle operation (not sure if it would or not) . I believe it is the unit in the trunk, bolted to the upper deck...can I just disconnect all wiring to it, and that would be it???? Fuse maybe although I didn't see one in the manual.

Thanks for your help.

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Old 09-23-2011, 07:40 AM   #2
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How does one disconnect GM's OnStar?


On most cars they used to put in the trunk, many times right behind back seat. not sure if that's changed over the years. if there is a wire harness that plugs in that can easily be unplugged, give it a try. i can't imagine you'd do any harm

If you just want to disable the tracking portion, look for the gps antenna connection and just unplug it. probably a push-in or bnc connector . If you can't find in the trunk, might be in the dash, behind the stereo

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Last edited by Mr Chips; 09-23-2011 at 09:20 AM.
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Old 09-23-2011, 09:59 AM   #3
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How does one disconnect GM's OnStar?


your SRS module will record a lot of info at any impact that trips bags also. Going to disconnect that too?
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Old 09-23-2011, 12:26 PM   #4
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How does one disconnect GM's OnStar?


Just be careful disconnecting the Onstar module. The computers talk to each other and if certain computers can not talk to the onstar, then it may not shut them down fully an can run down the battery. A dealership may be able to turn off the Onstar option so it dosen't think it should be there.
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Old 09-23-2011, 06:00 PM   #5
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How does one disconnect GM's OnStar?


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Originally Posted by ukrkoz View Post
your SRS module will record a lot of info at any impact that trips bags also. Going to disconnect that too?
ukrkoz, I respect you a lot from your knowledge in most of your answers that I have read. With your usual good advice, you generally have a little "bite" to your responses, that most people either ignore or it goes over their heads. My SRS module is different than OnStar...I know the difference. It seems you do not if you read my post. SRS is not sold, it is may be used in court cases, but it is not sold... Perhaps a little less bitterness or whatever would be beneficial.
Frankly I thought YOU would be so much against "big brother" because your general replies seem to be against dealers, government, and are probably living somewhere in a cabin in the Ozarks with M-16s waiting for the agents.

Last edited by polarzak; 09-23-2011 at 06:09 PM.
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Old 09-23-2011, 06:07 PM   #6
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How does one disconnect GM's OnStar?


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Originally Posted by D-rock View Post
Just be careful disconnecting the Onstar module. The computers talk to each other and if certain computers can not talk to the onstar, then it may not shut them down fully an can run down the battery. A dealership may be able to turn off the Onstar option so it dosen't think it should be there.
Thanks...D-rock..I think I will test it out on my wife's car. She has the same setup. OnStar knows what her tire pressure is, and probably the weight of the groceries she has in the trunk. I will unplug the device, with her approval, and get back to all to let anyone searching to know if it does or does not have an effect on the vehicle.
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Old 09-23-2011, 08:40 PM   #7
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How does one disconnect GM's OnStar?


no, I read your posts. SRS module records a lot of "last moment" information before impact. If you want to mention Big Brother watching, then keep in mind, that SRS module will record at least your speed at the impact moment, and if you were accelerating or braking. Logically, if you do not want to have any data available to any people in any situations - OnStar is not the only one saving them.
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Old 09-23-2011, 09:07 PM   #8
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How does one disconnect GM's OnStar?


I can tell you that in a Ford you can unplug the GPS transceiver. It's usually separate as it must have a more or less line of sight to function. No GPS, no position/speed/etc info. Will not affect other systems except satellite radio.
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Old 09-23-2011, 09:13 PM   #9
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How does one disconnect GM's OnStar?


so, if you have 94 and younger GM (and I know my Toyota is same way)...... here's a black box not many know about

The Automotive “Black Box”
Before deciding on automotive accident fault be sure to consider the possibility of the
electronic witness present in most General Motors and select Ford and Isuzu cars.
Since 1994, GM vehicles have been equipped with a Sensing and Diagnostic Module
(SDM) acting like a “Black Box” responsible for recording Crash Data and controlling air
bag deployment. Valuable vehicle data and switch conditions are stored for the critical
seconds before and following a crash event on the air bag module’s EEPROM.
There are two types of SDM recorded events (air bag Non-Deployment and Deployment). A Non-Deployment
event is significant enough to “wake up” or trigger the sensing algorithm but not severe enough to deploy or
fire any air bags. The module records Pre-Crash and Post-Crash data. The SDM can eraseably store
information for one Non-Deployment Event. The Non-Deployment data can be overwritten by an event that
has a greater SDM recorded velocity change (Delta-V) or will be cleared by the SDM after the ignition has
been cycled 250 times (about 60 days of normal driving).
The second type of SDM recorded crash event is an air bag Deployment Event. The module also maintains
Pre-Crash and Post-Crash data. The SDM can permanently store up to two different Deployment Events, if
they occur within five seconds of one another. The first deployment event will be stored in the deployment file
(this would have been the event that deployed the air bag) and the second Deployment Event will be stored in
the Near Deployment file. Deployment events cannot be overwritten or cleared from the SDM, thus once the
SDM has deployed the air bag, the SDM must be replaced.
Depending on the specific vehicle any or all of the following information is available:
- Vehicle speed (5 seconds before impact) - Engine speed (5 seconds before impact)
- Brake status (5 seconds before impact) - Throttle position (5 seconds before impact)
- State of driver's seat belt switch (On/Off) - SIR Warning Lamp status (On/Off)
- Passenger's air bag enabled or disabled state - Ignition cycle count at event time
- Time from vehicle impact to air bag deployment - Ignition cycle count at investigation
- Maximum ΔV for non-deployment event - ΔV vs. time for frontal air bag deployment event
- Time from vehicle impact to time of maximum ΔV - Time between non-deploy and deploy event
The SDM may be accessed and read by the Vetronix Crash Data Retrieval system. If the vehicle's electrical
system is operational, data can be read by connecting to the vehicle's Data Link Connector (DLC). The DLC
is located underneath the dash by the steering column, and is used by technicians to communicate with the
vehicle's on-board computer. If the vehicle's electrical system is not operational, then SDM data can be read
by connecting directly to the air bag module whether in or out of the vehicle through interface cables and an
external power supply.
The Crash Data stored in the SDM is utilized for many purposes by:
- Accident Reconstructionists - Law Enforcement - Insurance Adjusters
- Automobile Manufacturers - Vehicle Fleet Managers - Others
- NTSB (National Transportation Safety Board) - NHTSA (National Highway Traffic Safety Administration)
The readable Sensing & Diagnostic Module (SDM), “Black Box,” could yield vital information regarding Precrash,
Crash, and Non-Deployment events. Florida Forensic Engineering, Inc. owns and employs the Vetronix
Crash Data Retrieval system to obtain this valuable data for vehicle accident analysis.
Elliot L. Stern, PhD, PE
Florida Forensic Engineering, Inc
www.FlaForEng.com
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Old 09-24-2011, 07:22 AM   #10
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How does one disconnect GM's OnStar?


Quote:
Originally Posted by ukrkoz View Post
no, I read your posts. SRS module records a lot of "last moment" information before impact. If you want to mention Big Brother watching, then keep in mind, that SRS module will record at least your speed at the impact moment, and if you were accelerating or braking. Logically, if you do not want to have any data available to any people in any situations - OnStar is not the only one saving them.

I think the "bite" he is talking about is the smart azz attitude found in some of your posts. He was asking about Onstar and you threw out your SRS unit disconnect comment.
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Old 09-24-2011, 06:19 PM   #11
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How does one disconnect GM's OnStar?


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Originally Posted by D-rock View Post
I think the "bite" he is talking about is the smart azz attitude found in some of your posts. He was asking about Onstar and you threw out your SRS unit disconnect comment.
Exactly...Seems I am not the only one who has noticed. Thanks D-rock.
Anyway, I disconnected the antenna..it is now collecting but not sending.
Once people learn about OnStar collecting and selling....class action suits will prevail.
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Old 09-24-2011, 08:20 PM   #12
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How does one disconnect GM's OnStar?


Glad to hear the antenna disconnect worked for you. I get leery of folks wanting to unplug whole modules in newer vehicles because unless you have the network layout schematics, you don't know which modules serve as 'network bridges'. The average new car has 4 or 5 different types of network, and some modules serve as a transition point. IE, disconnect the RCM (airbag module), and you may lose certain functions of the Instrument Cluster, and so on. Just unplugging an antenna usually won't affect anything except sat radio and navigation.
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Old 09-25-2011, 09:58 AM   #13
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How does one disconnect GM's OnStar?


Thought OP might find this of interest. In my morning paper there's a story from the AP out of New York involving a few senators that are investigating GM and On Star for.... Selling information about customers after the subscription ended.
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Old 09-26-2011, 05:55 AM   #14
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How does one disconnect GM's OnStar?


Quote:
Originally Posted by ukrkoz View Post
so, if you have 94 and younger GM (and I know my Toyota is same way)...... here's a black box not many know about

The Automotive “Black Box”

The readable Sensing & Diagnostic Module (SDM), “Black Box,” could yield vital information regarding Precrash,
Crash, and Non-Deployment events. Florida Forensic Engineering, Inc. owns and employs the Vetronix
Crash Data Retrieval system to obtain this valuable data for vehicle accident analysis.
Elliot L. Stern, PhD, PE
Florida Forensic Engineering, Inc
www.FlaForEng.com
I am aware of the so called "black box", and have no animosity towards it all. I mentioned in my post that particular information is used diagnostics and court cases and as far as I know it is not sold. As a matter of fact I read in the paper some time ago about a fellow in Quebec that had and accident and the cops said he was speeding. A dump of the "black Box" info, proved he was actually going under the speed limit. So I do not have an issue with it.
I do have an issue with OnStar "SELLING" information to third parties. Example, my wife goes to the a particular grocery store twice a week, suddenly she starts getting phone calls from a competitor about their special sales. Probably not the best example, but I think you understand my concern. Collect the information you want, just don't sell it and then flood me with advertising or other junk phone calls. Anyway, there is no antenna connection now, so screw off OnStar.
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Old 09-26-2011, 06:42 AM   #15
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How does one disconnect GM's OnStar?


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Originally Posted by polarzak View Post
Collect the information you want, just don't sell it and then flood me with advertising or other junk phone calls.
I kinda have the opposite feeling: I've accepted the fact that I'm going to be flooded with advertising and phone calls regardless, so at least let it be for products & services I might actually want

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