i have a rear defogger problem. when i put the rear defogger on it turns off after about a minute and wont come back on for about 5 minutes in that time the power seat does not work and i changed the circut breaker fuse and the a/c - heater control unit is new as well it does this with both units and i cant find a relay the dealers manual says their is a relay but does not give the location and it is not listed under the hood. thanks for any help chris.