Daytime Running Lights not Working

[RetiredBob]

Doing a Google search indicates that it could be a fuse or the "DRL Module" is bad. Can someone point me in the right direction for locating these two items? Once I find it, how do I test the module? Any other suggestions for fixing the problem?

Edit: They have worked in the past. Also, I did check them with the engine running and the parking brake off.

[edgray]

Originally Posted by RetiredBob

Doing a Google search indicates that it could be a fuse or the "DRL Module" is bad. Can someone point me in the right direction for locating these two items? Once I find it, how do I test the module? Any other suggestions for fixing the problem?

Edit: They have worked in the past. Also, I did check them with the engine running and the parking brake off.

Wiring schematics can be found HERE: Workhorse Technical Info. be sure to select the correct one for you specific Model and year.



Just to double check the PB position, are you sure the dash indicator for the PB was NOT iluminated? All it takes to shut off the DRL is for the PB pedal switch to be "open", but that should turn on the PB "on" indicator light in the cluster.

[ktoutoor]

Go to 4:40 to see what the day time running light module looks like DRL

https://www.youtube.com/watch?v=OLugey4Hbdc&t

[RetiredBob]

Thanks for the replies. Fuse should be good as the other items on that circuit are working, grade brake, etc. (didn't want to go through the contortions to get under the dash to pull it). I'll now try to locate the DRL module. Any idea how to check to see if it is defective?

[LETMGROW]

On some vehicles the DRL will not come on until the shift selector is put into drive.