You have to get the code off the ecm(under the dash on the driver side) it will be a five digit code larger than any other numbers printed on the ecm. Then enter the code, the door should unlock, then press the 1/2 button within 5 seconds. Then you can reprogram a new code.
Each vehicle has it's own factory keyless entry code
"I found my code under the rear of the truck"
Where do I find the key less entry code on a 2001 Ford Expedition?
yes they do, i have it on mine.
My 1999 has it, so likely yes it was available in 2001
To change the setting on the keyless entry for your 2001 Blazer, first, locate the keyless entry transmitter. Insert the ignition key and turn it to the "On" position, but do not start the engine. Press and hold the "Unlock" button on the transmitter while simultaneously pressing the "Lock" button three times within five seconds. This should reprogram the keyless entry settings; test it to ensure it works properly.
Each 2001 Ford Expedition with key less entry has it's own factory code
You should have programming instruction in the user manual.
Somthing in denmark stinks..........
To determine if your 2001 Buick Regal LS is equipped with keyless entry, check the owner's manual for features listed under "Remote Keyless Entry." Additionally, look for a key fob; if your vehicle has a fob with buttons for locking and unlocking the doors, it likely has keyless entry. You can also inspect the driver's door for a keyless entry keypad or observe if the doors lock/unlock as you approach the vehicle with the fob. If you're still unsure, contacting a Buick dealership with your vehicle's VIN can provide definitive information.
the batterys in your keyless remote may need to be changed
A keyless entry remote on a 2001 Toyota Sequoia can not be reprogrammed at home. The key must be taken to a dealership where the engineers can program it with new settings.