![]() A low battery start attempt might also cause this to occur. The most common reasons why EWS might be failing DME sync is that the car was attempted to be started with only one of EWS or DME connected, and therefore the 2 units got out of sync. If the DME/EWS are failing to authenticate then errors will tell you so. The best thing to do in that case is get someone to scan the DME and EWS with a tool called INPA and check error messages. Yes possibly you could need to resync it. IF it is EWS, then it is in Step 2 - EWS-DME VALIDATION. Last edited by geargrinder 02-25-2019 at 11:21 AM. So theres a chance whoever you ask to do this says "oops I can't do this one". If you're trying to fix an EWS-key sync issue by having somebody re-program the EWS and key, some of the EWS have chips that can't be programmed by the normal programmers. If all else is 'known good', then there's a longer shot that the EWS module itself is bad. If the EWS doesn't see any key at all, or is showing sporadic weird results, then there's a chance that the ring antenna is bad or the wiring connector has gone bad or something. So even if EWS-Key sync is fine, and the starter itself is fine, the DME or relay indeed might have an issue. So on those cars, if starter isn't triggering, the DME itself indeed is involved in the process, via a relay behind the glove box. What should I really do instead of reading this, and instead of self-pleasuring myself to TMZ videos of Kardashians?įor 'no starter' conditions, E39 Automatic 540i's with the "autostart" feature (you turn the key to 'starter' and let go and the starter will run magically until engine catches) actually have the DME trigger the starter motor. This is the solution if the original DME is unavailable or truly dead.ĩ.
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