Quote:
Originally Posted by eskirvin
... I'm assuming the inductive coil for the coded start is somewhere in the valet key.
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Yes...all of the keys (remote and non-remote...aka "valet") has an EWS transponder inside that communicates the same ISN (individual serial number) with the EWS control module and DME.
The valet key's transponder is tucked into the head of the key...you can get an idea of the location in the 1st illustration below (look for the grayed-out area in each key head). If you look at your valet key...you can see that there's an access panel in the head of the key.
The EWS transponder chip (inside the old style remote & non-remote keys) uses induction technology, too...see 2nd illustration below that gives an explanation of the inductive functionality of the autonomous transponder chip found inside the aforementioned type of BMW keys. The new style remote key's transponder is soldered to the internal IC board...but the old style remote and all non remote keys have an "autonomous" EWS transponder chip.