Quote:
Originally Posted by VR777
Hello,
Past few months I have problems starting the car... Once a while, when I turn key to start position (cranking) nothing happens. Usually it starts after 2nd try. Sometimes if I hold long enough, it will start to crank. Today it started from 9th try (was ok whole day after that). When I say nothing happens, I really mean it. No dimming lights, no clicks, nothing. I think it may be relative to Ignition Switch or dying battery in key. Could someone, please, help me with an advice? Dealer will just throw different parts in car and rip money off 
thanks in advance
BMW X5 2006, 70k miles |
Help us help you better by adding one more small detail to your signature...what model X5 do you have? For instance, details that would indicate which engine you have (m54/m62TU/n62) gives those responding to your posts a clearer understanding of how to respond since not all e53 X5s are the same from 2000-2006.
I can say that the issue is NOT your key. The battery inside the key has no affect on its ability to start the engine. EWS is self powered thru induction...the ring antenna receives a 125 KHz AM signal from the EWS control module which then powers an induction coil inside the key which then powers the EWS transponder chip inside the key.
The battery inside the key only powers the transmission of the FZV/DWA (keyless entry/anti-theft alarm) RF signal.
Have you unlocked your OBC'S & ran TEST 9 to see what your battery's voltage is? Or used a meter to test the battery? Anything below 11.6 volts means the battery is at 0% state of charge & is usually operating on reserve capacity.