first off, is this a 99 monte? you never said for absolute, many cars some folks have.
you?
and 1 year newer can be vastly different.
19k upload limits me to zippo. here.
so try this.
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DRL module on your 99 monte
is left side dash.
next to and mounted on EBCM bracket.
now, dont have the foggest what GM TECH tools can program or not,
but , yours uses no external resistor.
so that leaves 2 possibles.
1: the DRL module PWM , modulates the lamp to reduce current
2: or has an internal resistor, so the module must get real hot.
there it is , all of it. (sans software) in fact there is no PCM or BCM
engine or body comes to this unit so any ECU commands that can defeat this
device is false (look at print)
that leaves only 2 possibilities
1: wiggling the 2 switches like crazy and see if it has a secret back door.
2: cut wires to DRL and see what happens. (expensive if you bust it)
the switches to wiggle are combo HL,park ,off and High low and Hand brake.
that is it.
cheers.