Buick 1993 Roadmaster Owner's Manual page 126

Yom
-w&gon:has 'a &t&A&-
wariiirib.light. It should
comb:'ori when the tailgate
is dpe;neis as .a door. It will
stay on until the tailgate has
been fully closed. It does
noi.come on when
the
tailgate has been opem%i as
a gate.