What could it be bcm maby ?

I don't think there is a fuse for the dash lights.
On newer GM trucks the lighting is handle by the body computer, the switches provide ground to the BCM and power for the dash lights comes from it.
The headlight switch provides a ground to the BCM and to the headlight relays. All of the external lights have fuses.
If you can't find a fuse for dash lights in the owners manual I will say it has been dropped.

Whenever this warning light or any other stays on in the dash it is indicating that the systems control module (or the system sensor in the case of lights like low oil pressure, door open indicators etc.) has detected a fault, it then disables the system (this applies to ABS,TCS, TCM, SRS and BCM faults and others) as long as the light is on. You must now have the dealer hook up a special electronic diagnostic tool and "scan" the system for the fault code that is stored for the problem(s)

Legend of Abbreviations. ABS Antilock brake system.TCS Traction control system, TCM Transmission control module, SRS Supplemental restraint system, BCM Body control module

Whenever this warning light or any other stays on in the dash it is indicating that the systems control module (or the system sensor in the case of lights like low oil pressure, door open indicators etc.) has detected a fault, it then disables the system (this applies to ABS,TCS, TCM, SRS and BCM faults and others) as long as the light is on. You must now have the dealer hook up a special electronic diagnostic tool and "scan" the system for the fault code that is stored for the problem(s)

Legend of Abbreviations. ABS Antilock brake system.TCS Traction control system, TCM Transmission control module, SRS Supplemental restraint system, BCM Body control module

Whenever this warning light or any other stays on in the dash it is indicating that the systems control module (or the system sensor in the case of lights like low oil pressure, door open indicators etc.) has detected a fault, it then disables the system (this applies to ABS,TCS, TCM, SRS and BCM faults and others) as long as the light is on. You must now have the dealer hook up a special electronic diagnostic tool and "scan" the system for the fault code that is stored for the problem(s)

Legend of Abbreviations. ABS Antilock brake system.TCS Traction control system, TCM Transmission control module, SRS Supplemental restraint system, BCM Body control module

Whenever this warning light or any other stays on in the dash it is indicating that the systems control module (or the system sensor in the case of lights like low oil pressure, door open indicators etc.) has detected a fault, it then disables the system (this applies to ABS,TCS, TCM, SRS and BCM faults and others) as long as the light is on. You must now have the dealer hook up a special electronic diagnostic tool and "scan" the system for the fault code that is stored for the problem(s)

Legend of Abbreviations. ABS Antilock brake system.TCS Traction control system, TCM Transmission control module, SRS Supplemental restraint system, BCM Body control module

have you had the BCM(body control module) checked for any service codes? it sounds like your BCM may be experiencing memory loss or failure.

I'd try putting a good battery in and trying it. A battery with an open circuit or one excessively low can cause problems.

BLINKER PROBLEM IS THE MULTI FUNCTION SWITCH FAULTY.WHICH IS THE TURN SIGNAL SWITCH DIMMER SWITCH AND WIPER SWITCH AND ALSO HEAD LIGHT SWITCH.YOU HAVE REMOVE STEERING COLUMN COVER BEFORE YOU CAN REMOVE THE MULTI FUNCTION SWITCH.TURN OFF RADIO DISCONNECT NEGATIVE BATTERY WAIT 15 MINUTES SO THE AIR BAG IN STEERING WHEEL WILL DISCHARGE. SECURITY LIGHT PROBLEM IS IN THE CAR KEYS WORN WHERE THE BCM AND PCM CANT RECOGNIZE THEM OR THE IGNITION SWITCH AND BCM IS FAULTY.THIS IS A DEALERSHIP FIX THEY HAVE TO REPROGRAM THE KEYS OR IGNITION SWITCH AND THE BCM.ALSO THE ABS AND TRAC LIGHT ON.CHECK ABS FUSE OR RELAY IF BOTH GOOD.DEALERSHIP HAS TO FIX THEY HAVE SPECIAL SCANNER TO CHECK THE ABS AND TRAC SYSTEM. FOR SPEAKERS EITHER THEY HAVE POOR WIRES CONNECTION

The BCM is located immediately above the heater controls inside the dash on my 2004 Astro. I know it controls the headlights and locks but not gauges. Haynes says the gauge fuse supplies it power....but I'm not going to bank on that one.

P/N 15081796 from Napa $115

Good Luck

you have no power coming in from one of the circuits from fusebox under hood. You will need to run new circuit line in from dash and BCM to the fuse box under hood