Chevrolet Uplander Owner's Manual page 112

If your vehicle has dual power sliding doors, you have
these switches. The PSD activation and PSD second
row passenger override (deactivation) is one switch.
Driver's Side and
Passenger's Side PSD
Switches
2-18
Your vehicle also has
passenger power sliding
door activation switch(es).
Passenger PSD
Activation Switch
If you have a single PSD,
this switch is located in
front of the passenger
side sliding door. If your
vehicle has dual PSDs,
the switches are located in
front of both sliding doors.