I just changed the battery on the alarm fab now it doesn't work? It's installed in a 2001 Toyota Tacoma.

SOURCE: remote not working how to manually disarm alarm

did you get a different key for your alarm box if not thy the ignition key. joe

SOURCE: program my remote

Program your factory keyless entry functions
For 2001+ Tacomas equipped with a factory alarm or keyless entry, here are some programming options that allow you to adjust the way your locks work.
The first programming option allows you to set the entry unlock to: (A) unlock the driver door with one push, and the remaining doors with a second push OR (B) unlock all of the doors with a single push.

• Open the driver's door. Remove the key from the ignition switch.
  
• (Complete these steps within 40 seconds)
  
  1. Insert the key into and remove it from the ignition switch 2 times.
     (IN - OUT - IN - OUT)
     
  2. Close, then open the driver's door 2 times.
     (SHUT - OPEN - SHUT - OPEN)
     
  3. Insert the key into and remove it from the ignition switch 1 time.
     (IN - OUT)
     
  4. Close, then open the driver's door 2 times.
     (SHUT - OPEN - SHUT - OPEN)
     
  5. Insert the key into the ignition switch and leave it in.
     
  6. Close the driver's door.
     
  7. Turn the key from LOCK to ON 4 times, ending at LOCK
     (LOCK - ON - LOCK - ON - LOCK - ON - LOCK - ON - LOCK)
     
  8. Wait for the locks to stop, then remove the key from the ignition switch.
     
• On the key fob, press and release both LOCK and UNLOCK buttons at the same time.
  
  1. [For all doors unlock] press and release the UNLOCK button.
     
  2. [For driver door unlock] press and release the LOCK button.
     
• Open the driver's door. The programming is complete. If programming did not occur, start over.

SOURCE: Does any body know how to reset the ML350 alarm??....The remote control doesn't work after i replaced a new battery to the remote control. I couldn't even use the remote to lock/unlock the car. I was

SOME OF THE REMOTES REQUIRE THAT THE KEY BE IN THE IGNITION, IN THE ON POSITION. TAKE THE BATTERY OUT AND WAIT 10 MINUTES. THEN PUT THE KEY IN THE IGNITION AND INSTALL THE BATTERY WHILE THE KEY IS TURNED TO THE ON POSITION. HOPE THIS HELPS YOU. PLEASE KEEP ME POSTED. THANKS FOR AN HONEST RATING AND FOR USING FIX-YA. GOOD LUCK

SOURCE: Hi. I lost my remote

You defintely need to get a remote for the alarm to disable it or uninstall the alarm altogether.

SOURCE: After disconnecting the battery and then

If after unlocking the driver door with the key and still no luck, put the key in the ignition and turn forward to start (if it won't start turn forward anyway) then push you're red reset button on the dash. That should do it.