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recheck battery new doesent mean cant be defective --if battery good fob may have lost memory and u need to reprogram it or sync it turn vehicle on not start and press unlock 7-10 times if not working --than fob either internal damaged or needs to be sync by saab
If this only happens when the key fob is close enough for the car to "hear" the signals transmitted from it then chances are the fob is failing. The FOB will have to be taken apart, cleaned and inspected for contamination/corrosion/stress cracks.
If the car does this on it's own even when the FOB has no battery or is too far away to be heard, then the problem could be internal on the TWICE (Theft Warning Module) or a power lock switch.
Since you said the horn beeps I would say it is most likely a FOB inadvertently transmitting signals even when you're not pushing buttons. Repair or replace the fob and you should be okay.
Did you already re-sync?
"After you change the battery, be sure to put the key in the ignition and start the car so it will re-sync."
"You sync it with the key in the ignition turned to 'ON' and press the UNLOCK button 7-10 times."
The fob is probably dead, needs a battery...if your doors dont lock with fob that would confirm this, and I believe there is also a fuse for the door button...will work when car on but not when off is a blown fuse I think.
Saab's have very specific steps that you must follow when you change the batteries in your key fob. You might try these steps to re-sync your key fob to your security system....
If the battery has been changed outside the
car and the car is locked, proceed as follows:
1 Unlock the front left door with the traditional
key. If the car has a car alarm, this
will be tripped.
2 Open the door and insert the remote
control into the ignition switch. If the car
has a car alarm, this will be silenced.
The remote control and receiver unit are