![]() ![]() The typical fob production cost here is 13 Euro without a key blade, also without metal in the housing.Įntry and start are complex systems, with many interlinked microcontrollers and sometimes with additional intentional complexity meant to deter hacking. The typical fob production cost here is about 9 Euro, not including the key blade. RKE fobs, with one LF coil and functions 1, 2, and 3 only.Immobilizer-only fobs, with a mechanical key blade and immobilizer transponder pill (no longer built, for at least 15 years). ![]() There are basically 3 types of traditional key fobs, but this Volvo key is an interesting special case: I haven’t been in the industry for 10 years, so all this is a bit dated.Īll my statements here are publicly available knowledge, so no trade secrets have been broken, and you can publish this. I was working at Siemens VDO (which then became Continental), mainly having RF subsystem responsibilities, and I worked on this key fob system. What follows is his response sent to me a few days later, only lightly edited by me for clarity: I’d love to publish any insights you might be able and willing to provide on the product’s development, feature set, bill of materials and/or anything else you think would be of interest to the audience. Good to “meet” you! Hope you enjoyed my teardown piece. I, of course, took him up on his offer that very same day: I was involved in the development of this key, a long time ago, and I can give you some insights (within the limits of not breaking trade secrets, of course) I was the one giving you a hint on the BOM cost for the key fob. Christoph Riehl (aka “chargehanger”, complete with the appropriately named website where he sells overhead cable holders for EVs) emailed me at the beginning of June: ![]() Happily, as we say back in my birth state of Indiana, he “took the bait”. I would love any additional insight you can supply, “chargehanger” (or anyone else knowledgeable on the topic, for that matter) as to how you came up with that BOM figure. So, in the subsequent teardown, I referenced the earlier comment from “chargehanger”, following up with what I hoped would be a too-tempting-to-ignore invitation: Given that I’d paid my local Volvo dealer $570, inclusive of “labor”, for a replacement key fob, I wasn’t going to leave that comment unexplored. The BOM for this key fob is around 19 Euro. One comment on that second blog post, from reader “chargehanger”, was especially intriguing:
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