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I've been expecting, & dreading, a key failure for years
Quote:
Originally Posted by andrewwynn
...If a trace breaks on the RFID circuit you can have an intermittent situation where the ckt makes contact when twisting the key just right....
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That sounds exactly like my key situation, but how would the circuit inside the chip become dislodged (I had assumed it it is a hardy piece, maybe potted in epoxy), or is the "passive" chip just informing the ring antenna that it is present, and the real work is then done by the EWS transponder>microprocessor>EWS pickup coil (or in the reverse order)?
 EWS key components
I did have a trace come loose when I replaced the battery in my key, 4.5 years ago, and the X wouldn't start until I soldered the trace into place. It seem s that I need to cut open my key and re-solder the trace, again, but I'll certainly need a spare "valet" key before I chance it.
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01 BMW X5 E53,3.0i-5L40E, 7/13/01
topas-blau,Leder-grau,"resto-project car"
Here:
14 Lexus ES350,3.5L-U660E
09 HHR Panel,2.2L-4T45E
04 Chevy 2500HD,6.0L-4L80E
98 GMC Sierra 1500,5.7L-4L60E
Gone:
66 Chevelle Malibu 2dr ht.,327>441c.i.-TH350>PGlide/transbrake
08 Cobalt Coupe,2.2L-4T45E
69 & 75 C10s,350c.i.-TH350
86 S10,2.8L-700R4
73 Volvo 142,2.0L-MT4
72 & 73 VW SuperBeetles,1.6l-MT4
64 VW,1.2l-MT4
67 Dodge Monaco 500 2dr ht.,383c.i.-A727
56 Chevy 210 4dr,265c.i.-PGlide
Last edited by workingonit; 11-23-2025 at 01:41 PM.
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