Chrysler 2005 PT Cruiser - Manual (Page 110)

The Universal Transceiver light will flash slowly and
then rapidly when the programming is successful.
NOTE: When programming such a garage door opener
or gate, unplug the device to prevent possible damage to
the garage door or gate motor.
Operation
Press and hold the desired button on the Universal
Transceiver until the garage door or other device begins
to operate. The light in the display shows that the signal
is being transmitted. The hand held transmitter may also
be used at any time.
Reprogramming A Single Button
1. Press and hold the Universal Transceiver button to be
reprogrammed. Do not release until step 4 has been
completed.
2. When the indicator light begins to flash slowly (after
20 seconds) position the hand held transmitter one to
three inches away from the button to be trained.
3. Press and hold the hand held transmitter button.
4. The Universal Transceiver indicator light will begin to
flash, first slowly, then rapidly. When the indicator lights
begin to flash rapidly, release both buttons.
Security
If you sell your vehicle, be sure to erase the frequencies.
To erase all of the previously trained frequencies, hold
down both outside buttons until the indicator light
begins to flash.
110 UNDERSTANDING THE FEATURES OF YOUR VEHICLE