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Car Forum / Honda Cars / October 2007"Black Box" information retention?
I've heard many conflicting stories and I'm hoping someone here knows a little more definitively. I am looking to find out if the "Black Box" on my Honda can retain information from a ceratin date a few months ago. (The car was involved in an accident, and has been repaired and driven since....) How long does the box retain the data? Thanks for your help. > I've heard many conflicting stories and I'm hoping someone here knows a > little more definitively. [quoted text clipped - 8 lines] > > Thanks for your help. It's a FIFO system. Stores something like 2 hours of data. I forget exactly how much.  SignatureTegger The Unofficial Honda/Acura FAQ www.tegger.com/hondafaq/ >> I've heard many conflicting stories and I'm hoping someone here knows a >> little more definitively. [quoted text clipped - 11 lines] > It's a FIFO system. Stores something like 2 hours of data. I forget exactly > how much. obd0 = zero obd1 = 30 secs i think obd2 varies depending on year and manufacturer, but the info is supposed to be pretty much comprehensive for anything the computer controls and covers an extensive period. > obd0 = zero > obd1 = 30 secs > > i think obd2 varies depending on year and manufacturer, but the info > is supposed to be pretty much comprehensive for anything the computer > controls and covers an extensive period. The data recorder ("black box") is independent of the ODB system. It records stuff like seat belt usage, air bag deployment, car speed and engine RPM. Automakers are beginning to add "black boxes" to their cars as protection against liability and fraudulent warranty claims. SignatureTegger The Unofficial Honda/Acura FAQ www.tegger.com/hondafaq/ >> obd0 = zero >> obd1 = 30 secs [quoted text clipped - 9 lines] > Automakers are beginning to add "black boxes" to their cars as protection > against liability and fraudulent warranty claims. that's very recent. prior to that, data recording is done by the ecu. >>> obd0 = zero >>> obd1 = 30 secs [quoted text clipped - 11 lines] >> > that's very recent. prior to that, data recording is done by the ecu. I'm not sure the data I list above was ever recorded by the ECU. That's why they started installing "black boxes" in the first place. SignatureTegger The Unofficial Honda/Acura FAQ www.tegger.com/hondafaq/ >>>> obd0 = zero >>>> obd1 = 30 secs [quoted text clipped - 13 lines] > > I'm not sure the data I list above was ever recorded by the ECU. the data i listed is though. > That's why > they started installing "black boxes" in the first place. original reason was a manufacturer legacy of product development and testing. then law enforcement became interested. the rest is history. >> obd0 = zero >> obd1 = 30 secs [quoted text clipped - 9 lines] > Automakers are beginning to add "black boxes" to their cars as > protection against liability and fraudulent warranty claims. Having typed the above, I remember now that I read once (not online) that the black box actually holds more like a minute to five minutes of engine- running time. The automakers are interested only in the events immediately prior to, and during, a collision or mechanical failure. SignatureTegger The Unofficial Honda/Acura FAQ www.tegger.com/hondafaq/ >>> obd0 = zero >>> obd1 = 30 secs [quoted text clipped - 16 lines] > The automakers are interested only in the events immediately prior to, > and during, a collision or mechanical failure. not necessarily. manufacturers are interested in driving habits and 5 mins isn't sufficient for that. law enforcement is /definitely/ interested in habit. if data analysis says you're an habitual speeder, late braker, and all-around madman, they want to throw the book at you. if your habit is law abiding, but you got in a fender bender, they won't bother. word is that insurance companies are interested in driving habit data too. imagine that! >>> obd0 = zero >>> obd1 = 30 secs > Having typed the above, I remember now that I read once (not online) that > the black box actually holds more like a minute to five minutes of engine- > running time. > > The automakers are interested only in the events immediately prior to, > and during, a collision or mechanical failure.\ Well again, the question comes forth...how far back is the information about a crash retrievable? If I wanted to access crash information from a day in the summer...would it still be there? Does it hold that information indefinitely...until the next crash? ...until you drive it again? ?? Thanks for your help! >>>> obd0 = zero >>>> obd1 = 30 secs [quoted text clipped - 16 lines] > > Thanks for your help! ------------------------------ Yes, the info would still be there if the vehicle has not been powered up since the crash. There would be x minutes of data available. You said the car has been driven since. If the 'black box' is in the car, the data is now gone. 'Curly' >>>>> obd0 = zero >>>>> obd1 = 30 secs [quoted text clipped - 24 lines] > You said the car has been driven since. If the 'black box' is in the > car, the data is now gone. I've got some answers: 1) The info is stored by the SRS computer, not the engine's ECU. 2) The SRS computer stores a "snapshot" of the final state of all the inputs when the engine was stopped for the last time. 3) The SRS computer also stores about 15 seconds of real-time data immediately prior to the last engine stoppage. 4) Dealership employees and techs are not able to access the info stored. This is only accessible by Honda. I have just asked when they started storing this info. SignatureTegger The Unofficial Honda/Acura FAQ www.tegger.com/hondafaq/ >>>>>> obd0 = zero >>>>>> obd1 = 30 secs [quoted text clipped - 36 lines] > > I have just asked when they started storing this info. further reading: http://www.vehicle-info.com/articles.php?id=22 now imagine your onstar "driver assistance" system phoning home your, er, "driving habits" to your insurance company, complete with gps coordinates in real time.... also: http://www.harristechnical.com/cdr5.htm > further reading: > http://www.vehicle-info.com/articles.php?id=22 [quoted text clipped - 5 lines] > also: > http://www.harristechnical.com/cdr5.htm --------------------------- Slightly OT, but I've heard of rental agencies handing the customer a big 'surcharge' for breaking the TERMS & CONDITIONS of the rental agreement for driving the vehicle like it was stolen. (the GPS tracking flagged them). They apparently thought they could bet from 'A' to 'B' at the speed of a rented jet. :-) 'Curly' >> further reading: >> http://www.vehicle-info.com/articles.php?id=22 [quoted text clipped - 15 lines] > > 'Curly' well, you /could/ do this with an individual's cell phone too. or credit card as you buy fuel along the freeway. or use license plate reading cameras every few miles. or have a transponder in every license plate and sensors in the road. in fact, there are already sensors in the road in many places. you know where there are two rings in the lane one after the other? those are used to sense average vehicle speeds and density, and thus manage traffic flow. putting a transponder in the license plate and having it talk to one of those speed sensors as you drive over it is trivial. automatic ticket issuance is more trivial still. >>> further reading: >>> http://www.vehicle-info.com/articles.php?id=22 [quoted text clipped - 26 lines] > of those speed sensors as you drive over it is trivial. automatic > ticket issuance is more trivial still. I often wonder if those double sensor loops are used to change an upcoming light to red if you're exceeeding the speed limit. It's possible. And all they need is to add a camera to get your lic.plate number as you trip the sensors at SL+ xMPH.Then you get a ticket in the mail. No need for any transponders in your car.(or the transponder microchip could be in the plate itself,in the sticker,or a reflective barcode read by a laser scanner.) SignatureJim Yanik jyanik at kua.net >>>> obd0 = zero >>>> obd1 = 30 secs [quoted text clipped - 14 lines] > Does it hold that information indefinitely...until the next crash? > ...until you drive it again? ?? From what I understand and have read, the information is very short-lived. If you've driven the car more than a few minutes since the summer, summer's information is long gone. I have asked these questions of somebody I know who is in the trade. If I get a response, I will post the results here. SignatureTegger The Unofficial Honda/Acura FAQ www.tegger.com/hondafaq/ reminds me of the joke about Bubba. the black box was set up to record voices just before a collision. Bubba's last words were 'Hold this beer and I'll show you a trick'. "Rob" <RobP@NoSpamPlease.com> wrote in news:9qWdnekUaOK8WpbanZ2dnUVZ_uCinZ2d@comcast.com: >>>> obd0 = zero >>>> obd1 = 30 secs [quoted text clipped - 14 lines] > Does it hold that information indefinitely...until the next crash? > ...until you drive it again? ?? From what I understand and have read, the information is very short-lived. If you've driven the car more than a few minutes since the summer, summer's information is long gone. I have asked these questions of somebody I know who is in the trade. If I get a response, I will post the results here. SignatureTegger The Unofficial Honda/Acura FAQ www.tegger.com/hondafaq/ If by "black box" you are referring to the SRS (supplemental restraint system) Unit. The answer is YES. Yes the SRS unit does store limited data, but only at the time of a deployment event. Dealers can only access DTCs with their scan tool, and nothing else (as related to deployment events.) Any Honda/Acura SRS Unit that can store DTCs, can and will store "deployment" DTC(s) at the time of deployment. This event data only records at the time, of a deployment. The SRS Unit does not know the date, time, or speed of the vehicle, at the time of deployment. What it does know and record, in permanent memory, is which seat belt was buckled, vehicle deceleration rate (in ms), which airbags, buckles or belt tensioners deployed. Cars with OPDS, SWS or ODS might also record front passenger weight (SWS/ODS), and front passenger position (OPDS/ODS), at the time of the deployment. So, in conclusion, no deployment, no data stored. -- Tp, -------- __o ----- -\<. -------- __o --- ( )/ ( ) ---- -\<. -------------------- ( )/ ( ) ----------------------------------------- No Lawsuit Ever Fixed A Moron... |
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