How To: Convert Headlight DRLs Into Marker DRLs A CFans Members Mod Project by burn Skill Level: Easy Disclaimer: Please use caution and seek professional assistance when necessary. ColoradoFans.com, the author, and all associated members are not responsible for any damages, injuries or other harm which may occur with this modification. This post does not reflect the views of ColoradoFans.com and its ownership. Before attempting this modification, it is advised to verify this will work on your Colorado or Canyon, as not all GMT 355's are same! PURPOSE: In this write-up, I will demonstrate how I converted my 06+ headlight DRLs into marker light DRLs (similar to the 04-05 models). This will also illuminate both markers, not just the outside marker as stock with the 04-05 models. For reference to what we are doing here; here is a before picture. Notice the headlights are lit, however the markers are not. (In order to get the DRLs to light I had to have someone hold the brake while in gear. When you are in park they turn off automatically). REQUIRED PARTS: Mini add-a-fuse circuit Rosin core solder Spare mini fuse 5 wire relay with harness
REQUIRED TOOLS: Small flat tip screwdriver Diagonal cutting pliers Wire stripper Electric soldering iron Sockets INSTRUCTIONS: 1. Here is an inside view of the fuse box cover. Please confirm yours is the same before proceeding. 2. I will be modifying the Front Park Lamp fuse and the DRL relay.
3. I will start with the mini add-a-fuse circuit. 4. You will need to modify the way the wire exits the add-a-fuse so that it comes out the opposite direction.
5. The reason is so that the cover can close. The add-a-fuse must be installed in this direction - if you just turn it around so that the wire exits towards the middle of the fuse box, this mod wont work.
6. You will use the 5-wire relay & harness; remove the wire for pin 87 from the harness, and cut the wire for pin 85 to be about 1" long. 7. Tin the backside of the terminal for pin 87. 8. Solder the wire for pin 85 to the backside of the terminal for pin 87.
9. Then reinsert it back into the harness. 10. Next we are going to need to remove the cover to the DRL relay. You also need to cut-off pin 87 on this relay.
11. Solder the wire from pin 87 in the new relay harness to the remainder of the pin 87 on the inside of the OEM relay: 12. Now we are going to need to make a notch in the cover of the OEM relay to allow the wire to exit.
13. Then reinstall. 14. Now we are going to need to cut a spare mini-fuse in half and strip away the plastic. You are going to need one of the blades. Solder the blade at a 90 degree angle to the wire from pin 87a.
15. Then solder the wire from pin 30 to the terminal on the mini add-a-fuse circuit. 16. Then plug the blade you soldered to wire from pin 87a into the socket in the add-a-fuse on the terminal side of the socket.
17. Then install it into your fuse box as shown.
18. Note the blue wire that is tied to the black wire is a ground. I was hoping to find a ground in the fuse box but was not successful. So I had to add an extension and just hooked it to the battery ground for the sake of testing. 19. Here is the finished result. Notice the headlights are no longer lit - but both inner & outer markers are lit.
20. Now after I got everything working I found that I couldn't close the cover. DOH! So I ended up going back and eliminating the relay harness and just using blade terminals to cut down on space. Here is the relay tucked away inside the fuse box. 21. Also make sure to cover all of your exposed wires; I use liquid-electrical tape.