1996 Buick Roadmaster

where is the lock relay located on my 1996 buick roadmaster wagon? only the drivers side door will remote unlock..none will lock remotely though i hear the clicking as though it is attempting to unlock/lock. the lock/unlock button on the door does not work to lock or unlock when physically pushed. i bought a lock relay figuring that was the problem. now i can't find it under the dash to replace! my husband is NOT gonna be happy that i ripped the dash apart! i can't find a schematic online or in a Chilton manual from the library...help me! thanks