1996 Tahoe 2 dr. Dash Rear Wiper and Hatch switch lights not working?

[RangerZ71]

96 2 door Tahoe dash rear wiper and hatch switch lights not coming on with headlight switch on. All dash and courtesy lights work. I've checked for power on the grey switch wires and have no power with light switch on. The switches work fine for operation, rear washer and wiper work and the hatch opens like it should, just no lights on the switch? Any help would be appreciated.

 

[east302]

Here are the wiring diagrams for a 96. Do you get no voltage on the gray using both the harness ground and a chassis ground? The radio lights share the same circuit, so if they work that should narrow it down somewhat. Voltage should drop to zero as the headlight dimmer switch is turned down.

If you get that far, the switches can be disassembled and the bulbs replaced. I used the same ones as the radio button lights - seems to work just fine.