If this is an Aux plug in I would think it be live all the time. Check
for a loose or broken wire going to the back of the socket. The wire
might have come loose from moving the seat or broke from body pressure
constantly pressing up & down on the seat. Is this tied in with the ash
tray lighter socket & if so does it work?
1991 Pontiac Bonneville LE
000,006 - Feb 4,1991
100,000 - Sept. 4, 1995
200,000 - June 19, 2001
1/4 Milllion - Jan 16, 2003
300,000 - March 3, 2005
500,000 - Dream On !