I am not familiar with the exact switch layout, but does any switch on the drivers door illuminate, how about the drivers window switch? Usually the bulbs, or nowadays LED's are serviceable only by component, so replacing the lock switch was a valid attempt. I am using GM service info, and the schematics show nothing for illumination of the memory seat switch, has it been illuminated in the past, and stopped working? I do show a feed for the lock switch, it looks like the gray wire is the dimming output from the panel dimming module which supplies just about all switches, and they are spliced from that output, but the memory seat switch is not part of it. I do show that the drivers door switch assembly has a dimming feed, and being that the memory switch may be part of that, it may share the same illumination. The entire dimming circuit is powered from this gray wire, and the voltage will be determined by the potentiometer setting, but by no means zero volts. On the drivers door switch, it is pin 5, a gray wire. If you can determine what, if any, voltage is present on this gray wire, that may lead you in a direction. The voltage should be the same at the lock switch, as the drivers door switch assembly. If there is zero, you will have to start breaking down the circuit to see where it is lost.
Saturday, February 27th, 2010 AT 1:51 AM