How about cracking the CAN bus and fooling the computer to think that DAS is satisfied?
That sounds like a lot more work, but at least your doors would not unlock while the engine started.
Other than that (perhaps very minor) problem, your approach does sound like it would work. The computer can't tell if you have inserted your blade or if you switch the circuit via another set of contacts.
Here goes, the car uses a electrical/mechanical steering lock. This lock is connected to the security system (das3).
When the key is inserted into the EIS (ign/starter switch) coded data is transferred via two redundant data lines using inductive energy from the key collar to the key. If it is correct the locking bolt is pulled out of the locking ring by a electro motor and doubly secured mechanically in the unlock mode. After confirmation a release signal is transferred to the starter switch and the key can be turned to pos 1,2 or 3. The engine control module initiates the start process, the start and run circuits are energized and the start sequence is terminated upon sucessfully starting the engine and getting confirmation from the engine control module when two simultanious "starting released" signals are sent back to the electronic ignition switch ( you must know that the key does not have to be held to crank the engine) it is only used to trigger the proceedure.
Trying to fool the system could leave you at speed with the steering locking, and a journey thru a cornfield, and possibly unable to turn off the engine.
I wish MB would design everything this bulletproof. The DVD has a flow chart and the key/start/unlock proceedure is 8 pages long
Last edited by Peter Guenther : 08-28-2008 at 12:27 PM.
code is generated IR and induced independently by the ignition module and the key.Once the doors are locked(a good thing)the ecu is notified by the ccm that the doors are locked and the ecu shuts down the fuel injection circuit.Now I am thinking you probably want your doors locked (after looking at the installation manual for that system you are thinking about,the only thing it does not do is rub your head while patting your belly)So your doors are locked you are 1/2 mile away and the ecu via the controller area network has shut down the fuel injection.How are you going to generate the rolling codes to pop the locks, induce the codes in the key that is not in the ignition circuit, and activate the ecu into turning on the fuel injection and the starter circuit to allow the car to start?
I'm telling you it is no simple matter and once you start trying to jury rig a bypass very very bad things can happen.The DAS system on these cars is not a matter to be taken lightly.Simple things like jump starting the car with the key in the ignition can erase the code generation and render the key useless,you are attempting something far removed from simple.
Good luck ohlord
I'm with Peter on this one
3000 ft. is a long way to chase after a car with a locked wheel and a running engine that someone had put in gear when they noticed the doors wer unlocked and a key was left in the ignition to generate the needed codes.
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ohlord
ugh, this has to be the smartest/biggest pain in the ass transponder system I've ever dealt with....even putting starters in BMW's isnt this damn complicated. It wouldnt be so bad if they didn't have to integrate the whole IR thing. *sigh*. here's to getting up early and going out to start the car by hand in -40 weather.
LOL. I am in school. I live in an apartment. It has no damn garage. I am SOL. Oh well, and least I have a good car. Might just have to put a block heater on.
)So your doors are locked you are 1/2 mile away and the ecu via the controller area network has shut down the fuel injection.How are you going to generate the rolling codes to pop the locks, induce the codes in the key that is not in the ignition circuit, and activate the ecu into turning on the fuel injection and the starter circuit to allow the car to start?
ohlord
Linear Mode
