Chevrolet 2002 Venture Owner's Manual page 134

Before your vehicle was shipped from the factory, it was
programmed in Mode 1. The mode to which the vehicle
was programmed may have been changed since it left
the factory. To determine the mode to which your
vehicle is programmed or to program your vehicle to a
different mode, do the following:
1. Follow the instructions for "Entering Programming
Mode" listed previously.
2. Insert your spare key fully into any door key cylinder
and turn it to the unlock position.
This step is necessary to prevent accidental
programming of this feature to Mode 2. Do not
program this feature to Mode 2 without first reading
the description for Mode 2 entirely. The door key
cylinder must remain in the unlock position during
Steps 2 through 4.
3. Press the horn symbol on the remote keyless
entry transmitter.
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4. Count the number of chimes you hear. The number of
chimes indicates the vehicle's current programmed
mode. (If you do not wish to change the current
mode, you can either exit the programming mode by
following the instructions later in this section or
program the next feature available on your vehicle.)
5. Press the horn symbol to change the current mode.
6. Press the horn symbol until you hear the number
of chimes corresponding to the mode selection
you want.
7. Remove your key from the door key cylinder.
The mode you selected is now set. You can either exit
the programming mode by following the instructions
next in this section or program the next feature available
on your vehicle.