In a 91 Previa, most of the fuses are under the top panel, at center of dash. There is a small release botton, under the lip of the dash panel, above the radio. There are some main fuses under the hood, by the battery.
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Driver side 1/2 way back under the along the edge.
4 pounds aproximatly
By using water
Follow the link below to the Previa user group.http://autos.groups.yahoo.com/group/previa/message/32333
approx 6.1lt
if i can remember right and most Toyota are the same around the 1993 and 1996 range ,you will find the signal relay switch behind the dash ,
above heater controls center of dash
chain chain
Located above the radio center console there is a dash board cover above the fuse box. Open by lifting on the top edge above the radio.
check the fuses for the head lights check the fuses for the head lights
push the a/c buttom in and lift the lock gently and take the cover off