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.

 

[RangerZ71]

east302, thanks so much for the schematic, great! Upon further work, it has turned out that the bulbs were burned out in both switches!! I'm in the process of trying to replace the bulbs with the led 3mm style. I did get a couple more switches from the salvage yard. out of 2 of each I did get a pair that works!! I bought this Tahoe brand new and the only driver.
I keep it up meticulously! the years of age has really started to catch up.
With your post I can easily check the circuits now. Thank you again.
I would like to get more air flow from the A/C blower as the flow is terrible in the heat of summer. I've checked the air box and it is clean with no visible crap. Motor runs on all speeds too. Air is cold also. I would think the issue is probably leaking doors inside the box, doors work properly with controls. I can't fix that I don't think. If there was a stronger blowing motor I think I would go for it.