If your alarm goes off constantly or does not armed by itself:

Does the alarm arm and disarm properly?  If it does proceed, if it doesn't, then have it checked by your installer.

1. Check and make sure your dome light is not staying on.  If it is make sure all doors are closed and/or the dome
    light switch is not turned on.
2. Check your sensor. Make sure they are not too sensitive. They can cause false alarm and also cause the system
    not to arm by itself.     
3. The alarm current sensing might be detecting voltage drop from the battery of the car or current draw from an
    equipment (maybe left on).

                                           If your car won't start check the following:

1. Does the alarm arm and disarm properly. If it does chances are is not the alarm.
2. When you try to start the car the alarm goes off.. It could be your battery.
3. Try to start no sound, nothing lights up, alarm doesn't work. It could be a loose battery terminal or dead battery.
4. Everything lights up, alarm works fine, but car still won't start. I could be a bad starter, starter disable in the alarm
    or check and make sure  the car is in "PARK" or press the clutch all the way down to the floor.

                                         To activate the Valet Mode do the following:

There is a push button or toggle switch to disable the alarm (to engage the valet mode). Without knowing where this
switch is you won't be able to disconnect the alarm.

1. Put the key in the ignition and turn it to the "on" position.
2. Flip the toggle or hold the push button for at least 5 seconds.
3. The LED. light will stay solid on.
4. Turn the ignition off
5. Release the push button. If you have a toggle leave it alone in step 2

                                       To de-activate the Valet Mode do the following:

There is a push button or toggle switch to enable the alarm (to disengage the valet mode). Without knowing where this switch is you won't be able to reconnect the alarm.

1. Put the key in the ignition and turn it to the "on" position.
2. Flip the toggle or hold the push button for at least 1 seconds no more than 2 seconds on most DEI products,
    keep it pressed in.
3. Turn the ignition off.
4. The LED. light will be off.
5. Release the push button. If you have a toggle leave it alone as described in step 2.

                                24-hour timer mode (477T Remotes)

(Activating and De-activating the 477T remote timer mode)

To enter timer mode, press the Lock and Start button simultaneously.
The 2-way remote will produce a melody and the clock indicator will
appear on the remote’s LCD. Once in Timer Mode, the system
will remote start every 24 hours. Repeat this procedure to turn
Timer Mode off.

                                         DEI Remote Transmitter Programming Guide: