The key then sends data to the EWS3 control unit. The power supply and data transfer take place in the same way as a transformer between the loop antenna (coil) at the ignition lock and the transponder chip. The transponder chip is powered by the EWS3 control unit via this coil, i.e. A ring coil is fitted about the ignition lock. The EWS 3.3 serves as an antitheft alarm system and enables the start of BMW vehicles.Ī transponder chip is integrated in each of the vehicle keys. May be no reason any of these should be issues but have to start somewhere.Įlectronic Vehicle Immobilisation System EWS 3.3 Check to make sure battery fully charged, gear selection showing up on cluster/try to start in N, try an alternate key if available, battery nap with both cables removed and touch before putting them back. I guess if it was mine I would start with the obvious. ![]() Once the key and EWS are happy with each other, signal is sent to the starter.
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