Park lights do not work, DRL headlamps work okay

Ken, Thanks for responding. I have already checked all fuses. Relays are working for all as well. The DRL turns on the headlamps but not the parking lights which are connected to the dash speedometer. The diagram I was going off of was same as the second one listed. Where the light green/black to the tail lights and to the DRL module is shown. This wire when tested has power at the DRL module, and also under the column. But DRL does not ground it or turn it on- if I take a test light to the wire and ground it - parking lights come on.

All turn signals, all other components are working. Relay for parking lights clicks on- when this light green/black wire is grounded. So I know the DRL is allowing the power to come in and connect it through, but whatever controls turning it on is no bueno.

Really need to know how DRL works. Have one coming used from salvage yard but no clue if it will fix it nor if the used one would have worked previously. Seems like if the DRL module is bad then it is confusing why the headlamps and all other parts it controls still work.

Also, in the diagram and in videos online the combo switch should work even if you have DRL, or if you disconnect the DRL pin 23 supposedly but my switch has never allowed this and I tried it. Combo switch shows it grounds out the parking and head lamps but it w ill not I believe due to how the DRL is wired, if you look at the schematic closer it shows that the combo switch can control the lamps but it would not have any power unless DRLsays to. For example; brights cannot come on unless DRL has told headlights to have power. The ground is fine there since the brights and turn signals work as well. This appears different for the park lights in schematic but its not. Does anyone have experience with their combo switch if it will override the DRL?

Sometimes I would like to bypass this altogether but that is a bit overkill to connect/cut all the related wiring.

Used DRL module fixed the issue. Still don't understand from the wiring diagram since combo switch shows you can also apply its ground - but clearly the DRL module is in charge of everything- and very sensitive to any change in voltage.