the driver's multiplexer unit can also be damaged from a aftermarket radio install if the dimer lead is left open and touches ground. they are easy to spot pull the fuse cover on the driver's side look behind the fuses you will see a box pluged into the fuse box it can be blue,white or some other color just remember those units are model specific Lx ,Ex ,2 or 4 door are diffrent they are about $150 new.