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    1. · Registered
      2022 2500HD High Country
      Joined
      ·
      1,908 Posts
      Okay, after looking at the BCM wiring, seems there's two separate relays that control the DRL part of the lighting, Pin 7 on X4 (black connector, left drl lamp control) AND X5 (brown connector, right drl lamp control). Without the vehicle here though, I can't test this function on your Canadian build, but if you're interested in seeing if it will work, you'll need to pull those two wires out of the harness and see if the DRL's are permanently shut off without losing your regular headlights. You'll want to use one of these to remove the pins properly:

      https://www.amazon.com/Xtozon-Terminal-Electrical-Connector-Extractor/dp/B088NNSQHV

      For 9 bucks, I'd sure as hell chance it and see if it works. If it doesn't, 9 bucks gone and wires are left unmolested, that's not so bad. Of course, you could also just snip the wire and see if it works, and if not, solder/heatshrink the wire back together, but I'd rather do it right than hack it all up!

      If you wanna try this out, lemme know and I can take some screen shots of the wiring guide and draw up a quick diagram to wire in a switch so you still have control over the DRL function. Note, due to the two separate wires for DRL control, you'll need a "DPST" switch for this to work, something like this switch (latching, not momentary):

      https://www.amazon.com/Button-Latching-Momentary-Stainless-Self-Locking/dp/B09M5VKXPK
       
    2. · Registered
      Joined
      ·
      55 Posts
      Okay, after looking at the BCM wiring, seems there's two separate relays that control the DRL part of the lighting, Pin 7 on X4 (black connector, left drl lamp control) AND X5 (brown connector, right drl lamp control). Without the vehicle here though, I can't test this function on your Canadian build, but if you're interested in seeing if it will work, you'll need to pull those two wires out of the harness and see if the DRL's are permanently shut off without losing your regular headlights. You'll want to use one of these to remove the pins properly:

      https://www.amazon.com/Xtozon-Terminal-Electrical-Connector-Extractor/dp/B088NNSQHV

      For 9 bucks, I'd sure as hell chance it and see if it works. If it doesn't, 9 bucks gone and wires are left unmolested, that's not so bad. Of course, you could also just snip the wire and see if it works, and if not, solder/heatshrink the wire back together, but I'd rather do it right than hack it all up!

      If you wanna try this out, lemme know and I can take some screen shots of the wiring guide and draw up a quick diagram to wire in a switch so you still have control over the DRL function. Note, due to the two separate wires for DRL control, you'll need a "DPST" switch for this to work, something like this switch (latching, not momentary):

      https://www.amazon.com/Button-Latching-Momentary-Stainless-Self-Locking/dp/B09M5VKXPK
      Thanks so much for efforts and input.
      This scares the crap outa me, imnot that comfortable and confident in this department.
      I think as someone just pointed out I may be confusing DRL with headlights.
      per Canadian law Headlights are always on.
      Local Chev dealer tried even had GM tech on line saying imported vehicles from Canada may have to install a US instrument panel cluster into a Canadian vehicle, as the required software calibrations may not be available.
      he provided a printed document ID. 5634889
      I’m stumped, but not giving up.
      just not prepared to take on myself and F It up worse.
      thanks I’m still open for any help
      You all are the best!!
       
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