unplug HDM, now no low beams?

bluejeepkid · May 7, 2013

well, I recently was having trouble with the HDM. it was making a funny noise every time I shut the jeep off. I unplugged it yesterday, now I don't have my low beam headlights. high beams work fine, just no low beams. any idea's why? all my fuses are good.

97 4.0

thanks!

bluejeepkid · May 7, 2013

I'm test lighting the main headlight harness connector and I see that 2 red wires, 1 purple wire and 1 black wire all go to the back of the headlight.
I think the purple wire is the low beam power and the reds are high beam power?

Please correct me if I'm wrong. I'm no electrical guru.

Digger87xj · May 7, 2013

HDM? Not familiar with that one

bluejeepkid · May 7, 2013

My bad, Headlight Delay Module

Digger87xj · May 7, 2013

bluejeepkid said:
I think the purple wire is the low beam power and the reds are high beam power?

Please correct me if I'm wrong. I'm no electrical guru.

thats correct.

Funny thing is unplugging the hdm should have no other effect than no delay after key off.

Check headlamp grounds near the pcm on the inner fender and the headlamp switch.hdm ground in the left kick panel.

joe_peters · May 8, 2013

Don't forget the KISS principle--jump power to the low beam and see it they aren't burnt out--lots of people driving around with one low beam and don't realize it, then the other lets go and checking the lamps is the last thing people think off.

The ground is common to hi and lo.

scoobyxj · May 8, 2013

bluejeepkid said:
I'm test lighting the main headlight harness connector and I see that 2 red wires, 1 purple wire and 1 black wire all go to the back of the headlight.
I think the purple wire is the low beam power and the reds are high beam power?

Please correct me if I'm wrong. I'm no electrical guru.

That is correct. One of the reds goes to the foglight relay for the high beam sense.

unplug HDM, now no low beams?

bluejeepkid

NAXJA Forum User

bluejeepkid

NAXJA Forum User

Digger87xj

NAXJA Forum User

bluejeepkid

NAXJA Forum User

Digger87xj

NAXJA Forum User

joe_peters

NAXJA Forum User

scoobyxj

NAXJA Forum User

Similar threads