Chevrolet 2003 Venture Owner's Manual page 127

If your vehicle has the power sliding door(s), you can
override the security lock by pressing either power door
lock switch when the power sliding door override
switch(es) is turned off. When the power sliding door
override switch(es) is turned
on,
the power sliding
door(s) cannot be opened from the inside when the
sliding door security lock is in use.
If you want to open the sliding door when the security
lock is on, unlock and open the door from the outside.
You should let adults and older children know how
the security lock works, and how to cancel the lock. If
you don't, adults or older children who ride in the
rear won't be able to open the sliding door from the
inside when the security lock feature is in use.
Canceling the Sliding Door
Security Lock
1. Unlock the sliding door and open the door from the
2.
Push the security lock lever all the way down.
3. Close the door.
4. Repeat Steps 1 through 3 for the other door.
outside.
The sliding door lock will now work normally.
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