[daless2]

Originally Posted by the_greenhorn

daless2, great post - very detailed. I have yet another question for you. I have an 08 CM with auto headlights and DRL's. I have been looking for a wiring diagram to add a simple switch to turn on/off my DRL's at will. Based on the diagram in your instructions, couldn't i put a switch in the same location that your diagram shows? Couldn't I just tap into J29 pin #3 white wire from ignition on and install the switch?

It sounds simple, but just wanted to run this by you since you obviously are very knowledgeable about the subject.

thanks in advance

Hi Greenhorn,

Thank you for your kind words.

If I understand it correctly you have an 08 with auto lights and Factory DRL and you want the ability to turn the DRL on and off at will using and on/off switch.

Is that correct?

I would not advise you to install the switch in the FACTORY wiring at J29, pin #3. This will work, but it will cause unintended consequences to the Turn Signals and the Hazard Warning Lights.


That said, I can give you some direction that will work.

Find connector J29. It is the one that plugs into the DRL/Flasher Relay.

Fine the Solid GRAY wire in pin position #5.

Insert your switch in this wire.


When the switch is turn on (Closed) your DRL will work as they do right now.

When your switch is off (Open) your DRL will be turned off.


This gray wire provides a ground signal to the DRL/Flasher Relay, from the Main Body ECU. By opening this wire with a switch the DRL/Flasher relay will no longer receive the ground signal to turn the DRL on.


I hope I was able to make this clear to you. If not let me know and I will give it another try.

Have a great day,

Frank