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Thread: Key Fob probelm
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Old 06-15-2012, 09:21 AM
gtsinc gtsinc is offline
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Location: Pittsburgh
Join Date: Jun 2012
Posts: 8
Mein Auto: 750il
Well, my Panosonic Batteries finally arived and I sliced open my keyfob to start surgery.
However I measured my existing battery and it was putting out 2.83 V. I would believe this is plenty. I did try the sync process previously and it did not work.

So what else can I test to see if it is putting out RF? all the solder joints look ok so far.
The Key starts the car so I assume the EWS / EEPROM is working fine.

I checked all the buttons using continuity and they are working.
I put a scope on what appears to be the RF antena (squiggly copper path on Circut board) I put one probe on one end and the other in close proximity. When the buttons were pressed I saw a spike on my scope.

I assume the microprocessor is working because it is reading the EEPROM otherwise the car would not start.

So I am at a loss for waht to check next.

Last edited by gtsinc; 06-15-2012 at 11:10 AM. Reason: added information
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