Chevrolet 4500 HD 2023 Manual page 222

Driving and Operating 221
LDW Switch
Use the LDW switch to change the timing
(sensitivity) of the LDW warning or to turn
LDW off.
With each press of the LDW switch, the
system will change from "Default" to "Less
Sensitive" to "System OFF" in that order
before returning to "Default". When LDW is
turned off, the LDW warning light (amber)
will come on.