I have a 03 Tahoe z71. I have a service 4wd message across my panel. When I first start the truck the lights on the 4wd selector switch will illuminate, but after it’s running they don’t work I can push every one and nothing happens. I unplugged the transfer case motor to see if they would light up but nothing. Any idea to why it’s saying this? I check the connections under the truck there’s 2 bolts but everything is clean and connected. Plz help

 

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