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The BMW Range
3 Series
E46
Starting problem
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<blockquote data-quote="jarance" data-source="post: 594790" data-attributes="member: 21"><p>The BMW key have two functions:-</p><p></p><p>1. To sync with GM5 module to open the door via remote control. This have a revolving code and a fixed code which will also check with the DME module. </p><p></p><p>That mean, I can program my key to open your door but I cant start your car.</p><p></p><p>2. The second function is another chip in the key. The Identity is check by proximity. i.e. when the key is inserted into the ignition slot.</p><p>When the ignition key is turn on (position 1 or 2), the EWS module will send a signal to ask an ID from the key. When it received the ID,</p><p>it will validate it and send another revolving code to the key, the key will be "written" and answer back and this is done in a split of a second. It all goes well, the EWS will tell the DME that it is OK to start or enable the "STARTER TO CRANK".</p><p></p><p>Please see the picture below when the wrong type of key is USED.</p><p><img src="http://i122.photobucket.com/albums/o271/pbjy/Project%20Bus/Capture_6.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Oh yeah, there is a 3rd function. You charge the key battery when it is inserted in the ignition slot.</p></blockquote><p></p>
[QUOTE="jarance, post: 594790, member: 21"] The BMW key have two functions:- 1. To sync with GM5 module to open the door via remote control. This have a revolving code and a fixed code which will also check with the DME module. That mean, I can program my key to open your door but I cant start your car. 2. The second function is another chip in the key. The Identity is check by proximity. i.e. when the key is inserted into the ignition slot. When the ignition key is turn on (position 1 or 2), the EWS module will send a signal to ask an ID from the key. When it received the ID, it will validate it and send another revolving code to the key, the key will be "written" and answer back and this is done in a split of a second. It all goes well, the EWS will tell the DME that it is OK to start or enable the "STARTER TO CRANK". Please see the picture below when the wrong type of key is USED. [IMG]http://i122.photobucket.com/albums/o271/pbjy/Project%20Bus/Capture_6.jpg[/IMG] Oh yeah, there is a 3rd function. You charge the key battery when it is inserted in the ignition slot. [/QUOTE]
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