DRL's

[MLTouch]

Anyone know how to activate the Daytime Running Light's feature on a 2002 Liberty Limited?

 

[ptsb5a]

Buy a Canadian version? Might just be a relay not included on the US KJs. Hold on while I consult my resources.....

 

[ptsb5a]

Well, looks like it's more than just the relay. Seems that along with the relay there may be some added software for Canadian export models. The FSM isn't quite clear on it. The BCM controls the intensity of the high beam filament when the headlights are "off" and uses the DRL relay located in the Junction Block in the passenger compartment to send a reduced voltage level to the headlight high beam cct.

That's about all I've got for you.

The Daytime Running Lamp (DRL) relay (Fig. 8) is
a solid state relay that is used only on vehicles manufactured
for sale in Canada.The DRL relay has four
terminals that are laid out in a footprint that is similar
to that of a conventional relay, a standard ISO
relay should never be installed in place of the DRL
relay. The DRL relay is installed in the Junction
Block (JB). Vehicles equipped with this relay ​

do not have a headlamp high beam relay installed in the

JB. The DRL relay cannot be adjusted or repaired and,


if faulty or damaged, must be replaced.​

OPERATION

The Daytime Running Lamp (DRL) relay is a solid
state relay that controls the flow of battery voltage to
the high beam filaments of both headlamp bulbs
based upon a duty cycled input received from the
Body Control Module (BCM) of vehicles equipped
with the DRL feature. By cycling the DRL relay output,
the BCM controls the illumination intensity of
the high beams. The inputs and outputs of the DRL
relay include:​

Battery Voltage Input - The DRL relay​

receives battery voltage on a fused B(+) circuit from

a fuse in the Power Distribution Center (PDC).​

Ground Input - The DRL relay receives a path​

to ground through the driver side instrument panel

end bracket near the Junction Block (JB).​

Control Input - The DRL relay control input is​

received from the BCM and/or the momentary optical

horn (flash-to-pass) output of the multi-function

switch through a high beam relay control circuit.​

​

Control Output - The DRL relay supplies battery​

voltage to the headlamp high beam filaments

through the high beam relay output circuit.

Because of active electronic elements within the
DRL relay, it cannot be tested with conventional
automotive electrical test equipment. If the DRL
relay is believed to be faulty, test the headlamp system​

​

before replacing the DRL relay.​

 

[speedracerbubba]

I have looked into this as well for my standard spec kj and it is wired for the DRL relay but I do not have one of them to plug in and test it out and to be honest I just never remember to look for one when I go to the auto parts store.

 

[al7fi]

Mine is an 03. Got the DTRL relay from Rockauto. Pull the headlight relay and then put the DTRL in the relay slot so marked. You then need to have the country code in the BCM reprogrammed from US to Canada. My dealer in Anchorage did it for free.
He had no clue it could be done until I talked his ear off.
I had pulled the HL relay and installed the DTRL when I went to check with them. He asked if I had the relay, told him yes, we went outside (about 0F) and he said to start it up, may as well be warm. Plugged in the super tool, went to the BCM menu, found the origin, and changed the US to Can, hit the enter button and lo the lights came on.
What you end up with is the high beams running at reduced voltage when ever the engine is running. Otherwise all is as you are used to. In park, one click up on the parking brake lever and the lights go out.
I have the 03 FSM and looked in the trouble shooting section for the DTRL to discover what needed to be changed. It is a different procedure for later years however, but I am pretty sure the 02 is same as 03.
See:http://www.jeepkj.com/forum/showthread.php?t=33354&page=2

 

[Doublecardan]

Somewhere around 05, Chrysler stopped using a reduced light output for their DRL, now they just use highbeams and they are a royal pain to see coming at you. Especially the Rams and Grand Cherokees, Americans are lucky they dont have DRL as a rule for Chrysler otherwise roadrage would ensue. This is not imply that those who want DRL are wrong only chrysler did it the wrong way. Oh and when the dealership set the origin from US to Can, did it switch you to KM on the Odo?

 

[ShafferNY]

... Oh and when the dealership set the origin from US to Can, did it switch you to KM on the Odo?

I was wondering the same thing.

 

[al7fi]

Somewhere around 05, Chrysler stopped using a reduced light output for their DRL, now they just use highbeams and they are a royal pain to see coming at you. Especially the Rams and Grand Cherokees, Americans are lucky they dont have DRL as a rule for Chrysler otherwise roadrage would ensue. This is not imply that those who want DRL are wrong only chrysler did it the wrong way. Oh and when the dealership set the origin from US to Can, did it switch you to KM on the Odo?

No it did not. I think that is controlled through another module, but I do not have the FSM here to check. I have not noticed any other changes since I made the change. I am somewhat inclined to try and get the rear fig lights working also (a brighter taillight is what it looks like, possibly from the other red lens). I have not done anything as yet, since it was not a big issue, even though heavy snow and thick fog are an issue here also. Many of our highways require headlights on at all times and the DTRL option satisfies that. This way I do not burn out the low beams from constant use, and since the high beams in this mode are at reduced voltage, I doubt they will burn out any quicker.