September 5th, 2010 
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2000 BMW Z3 keyless entry wont work?
Wont lock or unlock the doors, chirps 3 times although all doors, hood and trunk is shut. Both remotes do the same. What is the cause? No open door lights on the dash either.
The 3 chirps mean that one of the alarm switches is tripped. Have you done any work on your stereo recently? If yes, then the problem will be the switch behind your radio. There is a long probe (2 inches) that attaches to the back of the stock radio that inserts into the alarm switch. Many times that probe "misses" the switch if the radio is removed and reinstalled (the alarm thinks the radio is being stolen if the probe is not inserted into the switch). Aftermarket radios do not have the probe, so the usual remedy is to unplug the wires from the switch. You will have to remove the radio and reach into the hole to unplug the switch (leave it unplugged).
The second most common failure is the hood switch. That switch is under the hood on the driver's side, in the front of the car, just above the headlight. You will see a black, pencil eraser sized plunger sticking up. You need to unplug the wires to that switch to test it. If you can unplug it and the alarm then works ok with the switch unplugged, then that is the problem.
If neither switch above is the problem, try pulling fuses 31 and 43. Wait about 30 seconds, then reinstall them. That will cycle power in your alarm module. Hopefully, that will reset the module if the problem is there.
2001 BMW Z3 #K49013 in Raleigh, NC 27616
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