So this is a weird issue, I have a 04' Disco with Trail package that came with factory cattle guard that is rubber (more of a suburan cattle guard) and factory fog lights that are plug and play. I took the guard off a couple years ago because I liked the clean look of the front end. So today I mounted it back on for a change, plugged in the fog lights and now they only come on when the high beams are on, they are supposed to only come on with low beams and off with high beams. Does this sound like a relay issue?

Nothing has really changed from when I took it off 2 years ago and now, any clues on this?

 

Those are considered “driving lights” and yep they come on with high beams usually with the aux LR harness.

 

Hmmm. I must be remembering wrong then as it's been a couple years since I took the guard off, couldn't sworn they only came on with low beams.

 

In some states, that is a no-no. Fogs go off when high beams go on.

 

They can be changed to come on/go off with high beams or individually.
You need a Hawkeye, Nanocom, or OB2 with LR software.

 

“If” it’s using the LR Aux wiring harness it’s usually tapped into the high beam circuit. Those are Aux Lights/Driving Lights/Off Road lights vs fog lights.

The Fog Lights are mounted low in the front bumper on all SE & up D2’s. You can program the fog lights to come on with high or low beams, but if it’s using the aux wiring it’s normally hard wired into the high beam circuit up by a headlight with the relay under the hood and it either comes on automatically when high beams are selected or there is an Aux Light Switch to enable/disable them. Or someone “could” have just used the Fog Light harness as a trigger. Just depends on how it was done at the dealer. (Normal practice was high beam trigger though).

 

I have an Ultra Gauge, can I change it over with that?

 

Nah, that works on anything OBD2.
It has nothing Land Rover specific in it.
Where are you located? edit, nevermind, I see Fort Wayne in your signature, I'm in Va.
Maybe one of us with a Hawkeye, Nanocom, or Foxwell is close by.

 

That would be great if I could borrow one, don't want to spend that much just to hack the driving lights.

 

Normally the T4 was just able to tweak the fog light on/off setting. The Aux lights had their own wiring harness/relay and can't be programmed. However if it's wired like I'm thinking it's very simple to switch em over.


The Aux setup uses a relay, it gets a trigger input to the relay whenever high beam is selected because the trigger input is tapped into the high beam circuit. All you'd have to do is disconnect the high beam wire and tap into the low beam circuit. Then whenever the low beams are on the relay would be triggered. Then "if" you have a switch you can control it's on/off operation.


But those lens in those aren't really designed to be used with low beams as fog lights. You'd have to aim them down as to not blind other motorist at night.


That's why LR normally had em with the high beams to be used off road or out in the middle of nowhere.