DRL Module Wiring, Land Rover LR4 to LR3

Printed From: the12volt.com
Forum Name: Lights, Neon, LEDs, HIDs
Forum Discription: Under Car Lighting, Strobe Lights, Fog Lights, Headlights, HIDs, DRL, Tail Lights, Brake Lights, Dashboard Lights, WigWag, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=144631
Printed Date: May 01, 2025 at 6:43 PM

Topic: DRL Module Wiring, Land Rover LR4 to LR3

Posted By: elocin671
Subject: DRL Module Wiring, Land Rover LR4 to LR3
Date Posted: July 28, 2018 at 9:40 PM

Hi,

Can anyone help me figure out how to wire up my DRL's. I'm retrofitting 2015 Land Rover LR4 headlights into a 2007 LR3.
The single DRL LED strip from the LR4 has two pins that need positive 12VDC, at different times.

PIN# 2 lights up the strip as Parking lamps, at a lower voltage via its own LED controller.
PIN# 8 lights up the same strip as DRL, at full voltage via its own LED controller.
PIN# 1 is ground

So basically, I need a circuit that will provide DRL Pin# 8 with positive 12V when engine is running, and cut off all power to Pin# 8 when PIN# 2 (+12V) parking lights come on, and when engine is off.

Any help is greatly appreciated. Thanks!

Replies:

Posted By: elocin671
Date Posted: July 29, 2018 at 9:38 PM

Hopefully someone can chime in if my diagram I just made will work or not, or what changes I should make. I did bench test pin 2 and 8 separately, while using pin 1 as ground and they worked as they should.

I will be making my own relay harness, and bypassing the factory wiring for those pins. Is a diode needed?
My concern is to avoid putting 12v+ on PIN 2 and 8 at the SAME time, as this would most likely fry the LED controller since it uses a single strip for DRL and sidelight (parking lights).

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Posted By: the12volt
Date Posted: July 29, 2018 at 10:13 PM

Your diagram looks good to me. If you want to add a diode across the coil of the relay, it won't hurt, but it doesn't look like it's needed.

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