[ale] [OT] Looking for someone to do SMD rework.

[Jim Kinney]

Pay the dealer. That's their method of keeping keyless access secure as
the dealer will request ID and check (supposedly) ownership records
before doing the transfer. The ID stuff is signed in the chip at the
factory which is why even the dealer can't do it.
That's cheap compared to the new ignition switch for a '02 VW golf -
$1k. That included the towing charge. <sigh>
On Thu, 2018-03-29 at 20:01 -0400, Byron Jeff via Ale wrote:
> Solomon,
> 
> I replied to Horkan offline. I realize now that his reply went to the
> list
> even though it didn't show in the header of the reply that I got. So
> here's
> my commentary.
> 
> ------------------------------------------------------------
> 
> I wish it were so simple. But alas I have a Fiat 500e, and so it's
> not.
> 
> Fiat uses Philips crypto transponders that have a challenge response
> with
> the BCM. Essentially the secret key is embedded into the BCM of the
> car and
> is written on the crypto block of the transponder and then locked.
> Once
> locked, the crypto page cannot be read or changed on the transponder.
> 
> So there are only three ways to 'pre-code' new keys that can be
> programmed
> into the vehicle:
> 
> 1. Pay the dealer. $175 a fob. Supposedly shipped from Italy.
> 
> 2. Pull the BCM and read the secret key out of the memory. This
> involves
> unsoldering parts, dumping memory into software, then precoding
> and locking new blank transponders.
> 
> 3. Pay a ton of money for a tool that reads the BCM memory via the
> OBD/CAN
> connector. Then precode and locking new blank transponders.
> 
> Then and only after a blank transponder has been precoded, can the
> new keys
> be introduced to the BCM. Dealers charge upwards of $100, in addition
> to
> the keys for the priviledge. In addition all authorized keys have to
> be
> programmed in at the same time.
> 
> It's a battle I've been fighting for 6 months. It's a damn shame that
> 10
> bytes of key information and the protocol to read/write the BCM are
> hidden
> so that dealers can charge a ton of money just to authorize keys.
> 
> ------------------------------------------------------------
> 
> BAJ
> 
> -- 
> Byron A. Jeff
> Associate Professor: Department of Computer Science and Information
> Technology
> College of Information and Mathematical Sciences
> Clayton State University
> http://faculty.clayton.edu/bjeff
> 
> On Thu, Mar 29, 2018 at 07:14:06PM -0400, Solomon Peachy wrote:
> > On Thu, Mar 29, 2018 at 03:58:38PM -0400, Horkan Smith via Ale
> > wrote:
> > > Are you sure it wouldn't be easier to retrain your car to the new
> > > key fob?  I've done that for Fords & Chevys w/ instructions from
> > > 3rd party key fob sellers.  The instructions varied, but usually
> > > involved shorting two wires on the OBDII port or using a strange
> > > pattern of key-on/key-off/lock-doors/etc.
> > 
> > I second this suggestion.  I bought my daily driver with no fobs
> > and 
> > a disabled security system.  Now everything works; the
> > instructions 
> > were actually in the owner's manual.
> > 
> > That said, many vehicles require a working fob in order to train a
> > new 
> > one.  It all depends on the manufacturer and model.
> > 
> >  - Solomon
> > -- 
> > Solomon Peachy			       pizza at shaftnet dot
> > org
> > Coconut Creek, FL                          ^^ (email/xmpp) ^^
> > Quidquid latine dictum sit, altum videtur.
> 
> 
> 
-- 
James P. Kinney III

Every time you stop a school, you will have to build a jail. What you
gain at one end you lose at the other. It's like feeding a dog on his
own tail. It won't fatten the dog.
- Speech 11/23/1900 Mark Twain

http://heretothereideas.blogspot.com/
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