I changed the battery on my 2001 Tiboron and now the factory alarm system will not let me start the car. I do not have a key fob

To disable the alarm system in a 2001 Chevy Tahoe, try the following steps:

1. Close all doors and windows.
2. Insert the key into the ignition and turn it to the "ON" position.
3. Within 10 seconds, press the lock button on the driver's door five times. The alarm system should turn off.

Note: The above steps assume that your 2001 Chevy Tahoe has a factory-installed alarm system. If it has an aftermarket alarm system, the steps to disengage it may be different.

You will probably need to replace the fob as that will contain the code to turn off the alarm and immobiliser. You might have to go to a dealership if it is a factory fitted security system.

horn going off and wipers? could i ask what was the reason for removing the battery in the first place.

Jeremy: According to eHow.com: "

1 Press the "Unlock" key on your key fob to deactivate the alarm and unlock the car doors. If you've lost your key fob, unlocking the driver's side door with the key automatically deactivates the PT Cruiser's alarm.

2 Look for the black alarm box underneath the dashboard, on the driver's side of the car. Locate the override button on the box -- either a black or red button, depending on the year of the PT Cruiser -- but don't press it yet.

3 Put the key in the ignition and turn the key so that the battery is on, but the engine doesn't start. Quickly push and hold in the override button until you hear the alarm sound once, indicating the alarm is disabled.

Read more : http://www.ehow.com/how_7739471_disable-cruiser-factory-antitheft-system.html"

When replacing the key fob battery there is no reprogramming required! If the key fob was working prior to the battery replacement then it would point to the contacts not being correct! Remove key fob battery and start again!

Aftermarket alarm system?? If so it could be anything with that alarm. If it's the factory security system, this is totally normal. When you disconnect the battery and reconnect it, the system resets and automatically "panics" because it saw the power failure. If it's the factory system, simply have the key fob handy to turn it off after you connect the battery. If you don't have a remote fob, just put the key in the driver's door and unlock it. This will override and shut off the system.

change the battery in your fob. check the power in your battery may need a recharge.

On some key fobs for alarms and central locking if you change the battery it has to be done in a set time or it fails to work.is it a factory or aftermarket device? Have you changed the battery?

First, check that you're child safety lock isn't set for that door...If thats not possible then the next culprit might be the alarm FOB battery. IF, its an aftermarket alarm FOB you're in luck...changing the batt should do it...If it IS a factory alarm FOB, you have TWO choices...get a new aftermarket keyless entry system $89-129...or go to the dealer for reprogramming the remote, about $89.
Good Luck

change the battery's in the key fob