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Message: <blockquote data-quote="astroboy" data-source="post: 352137" data-attributes="member: 4527">Look at it this way.. The EWS handles the engine start while the CAS handles the door looks, steering lock and stuff.Before engine is allowed to start, EWS will ask CAS some questions and CAS will answer them. If the answer matches EWS's expectation, then only engine start is allowed and every time, the question changes. Today EWS will ask "What is your favorite cartoon character?", tomorrow EWS will ask "What is your favorite color?".. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue    :p" loading="lazy" data-shortname=":p" />So when replacing the system means both EWS and CAS must be replaced together or else CAS will keep telling the wrong answer, and EWS refuses to issue green light to start the car.Interesting!</blockquote>