Help. Headlights and instrument panel lights out.

Posted by: Florida_Mike

Help. Headlights and instrument panel lights out. - 10/25/21 01:03 PM

In the process of installing Marauder corners. I picked up a pair of 06 - 2010 corner light harnesses. Got the drivers side done with no issues. Initially the cornering light did not work, but after unplugging and replugging the harness a few times it started to work. So I figure the Vic connector pins were dirty from non use. Started on the passenger side and tried to test the harness. I had parking light and turn signal, but no cornering light. So I figured same issue as driver side. Then I noticed that I had no headlights, high or low. Nor did I have any instrument panel lights. I have parking lights and turn signals and the cornering light on the driver side. I have not plugged the passenger side harness back in, so I don’t know about the cornering light on passenger side. I have interior lights. And the radio panel dims if I cover the sensor with the light switch in auto. Looking at the fuse panel and power distribution layout, it doesn’t make sense for what I have working and not working.

Any suggestions?
Posted by: Florida_Mike

Re: Help. Headlights and instrument panel lights out. - 10/25/21 06:51 PM

The harnesses are plug and play, so no rewriting involved.
Is there anyway I could have damaged the LCM?
To quote Ben Stein’s character in Ferris Bueller’s Day Off,
Anyone? Anyone?
Posted by: av8or1

Re: Help. Headlights and instrument panel lights out. - 10/25/21 09:07 PM

Would need a little more background in order to offer feedback. Is this on your 2004 P73? Which wiring diagrams are you referring to? Can you include pictures of those? Or pictures of what you have done thus far?

I ask because IIRC the cornering lights from a GMQ (and presumably a Marauder) are not plug-n-play with a CV. Or at least they weren't on our 2006 CV. Additional wiring was required. It is unclear if the same applies for a 2004, which is why I ask for the diagrams. And pictures.

Anyway...
Posted by: SocalSam

Re: Help. Headlights and instrument panel lights out. - 10/25/21 09:37 PM

Undo your mods to see if problems go away.
Posted by: Florida_Mike

Re: Help. Headlights and instrument panel lights out. - 10/26/21 05:16 AM

Yes this is on my 2004 P73.
Correction. I went out and checked after dark. My instrument panel lights do work. Everything works as it should, even auto-lights. Just no headlights in auto-on or manual on position. I could be mistaken on the plug and play, but the installed driver side appears to work. The following is true with the headlight switch in the auto or manual on position. Parking light works, turn signal works, and the cornering light works when the turn signal is on. But I also found the cornering light is on with the multifunction switch in the turn position with the key in the run and off positions. I found a video that shows that is normal. The parking lights, interior lights and instrument panel lights all turn on, when it’s dark, when unlocking the doors with the key fob. Flash to pass is also not working.

Going back and reading about the wiring mods, it looks like if a 96 CV corner harness is used, it needs to be modified. My CV wiring harness has 4 pins, so already wired for the turn signal. And I used the GM harness to connect the lights to my CV wiring.

Also found this video.
https://m.youtube.com/watch?v=7GcFFMGkTUM

I did not have to move any wires in the GM harness as the video shows. But I think he was swapping the wrong wires when showing how to do it.
Posted by: Florida_Mike

Re: Help. Headlights and instrument panel lights out. - 10/26/21 12:41 PM

Found fuse 27 was blown. Replaced it. I now have headlights, high and low. I have the corner parking light and turn signal, but no cornering lights. Odd that with the fuse blown I had cornering lights.
Posted by: av8or1

Re: Help. Headlights and instrument panel lights out. - 10/26/21 01:08 PM

Hi Mike,

Yeah I was suspecting a blown fuse in regard to your headlight inop scenario. Good that you found it, one thing down. That said ...

Without seeing pictures of your modifications, most specifically the wiring near the connectors and a diagram for a 2004 (to see if it is any different from our 2006, which I kinda doubt, but maybe) I can't offer much additional help. While it is true that some CVs came pre-wired for it and thus it is possible that your P73 is among them, until I see some pictures of what you have I can't tell.

What I do know is that our 2006 LX Sport was not pre-wired for cornering lights. I had to run additional wiring from the firewall connector (C260) through the driver's side of the engine bay harness that ran to both the driver's side and pax's side corners, respectively. Furthermore, I had to install new connectors, as the ones that were present could not physically support cornering lights. The same holds true for our 2010 CVPI. And the other 2010 CVPI that we had (sold it a while ago). And every other CVPI that I've bothered to dig that deep into one fender or the other.

My cornering light install began here:
Ol' Blue cornering light install

So you might take a look at that as a comparison to your situation. A couple of diagram pictures are included in that writeup, so you could compare those as well. I digress. Without data, this is as much help as can be offered. Good luck, hope you get it working!
Posted by: Florida_Mike

Re: Help. Headlights and instrument panel lights out. - 10/26/21 01:43 PM

I have the same as the YouTube video in my 3rd post in this thread.
Posted by: Florida_Mike

Re: Help. Headlights and instrument panel lights out. - 10/27/21 05:46 AM

Went out in the dark again. Still no cornering lights. And initially had a bit of a delay when switching from low to high beams. This seemed to resolve itself after switching between high and low beams a few times.
What still doesn’t make sense is why the corner lights work when fuse 27 was blown, but not after replacing it.

As stated, the Vic wiring to the corner has 4 pins and I am using the 06 - 2010 GM corner light harness.
Posted by: SocalSam

Re: Help. Headlights and instrument panel lights out. - 10/27/21 11:12 AM

Do you have a different MFS to try?
Posted by: Florida_Mike

Re: Help. Headlights and instrument panel lights out. - 10/27/21 11:24 AM

No I do not.
Posted by: Davidzq

Re: Help. Headlights and instrument panel lights out. - 10/27/21 11:37 AM

How did you wire up the corner lights?
From factory, each corner light is powered by the park light circuit (brown wire), then has another wire which runs to the multifunction switch, which connects them to ground.
These wires between corner lights and MFS are missing on vics and need to be added.

I'm assuming you instead connected these to the turn signal wire. The park light circuit is grounded when lights are off, thus the cornering lights would work when turn signals are triggered (but would flash), and would not work when park lights are on.
Posted by: av8or1

Re: Help. Headlights and instrument panel lights out. - 10/27/21 12:35 PM

Originally Posted By Davidzq
How did you wire up the corner lights?
From factory, each corner light is powered by the park light circuit (brown wire), then has another wire which runs to the multifunction switch, which connects them to ground.
These wires between corner lights and MFS are missing on vics and need to be added.

I'm assuming you instead connected these to the turn signal wire. The park light circuit is grounded when lights are off, thus the cornering lights would work when turn signals are triggered (but would flash), and would not work when park lights are on.

This is correct. I was thinking that this scenario is what was at play here. Unless I saw otherwise my conclusion was a-gonna be that he doesn't have the wiring to run the cornering lights and that he would need to add that wiring to his harness, as I (and others) did. Thus my request for pictures, etc. But those haven't come forth, so I gave up the ghost.
Posted by: Florida_Mike

Re: Help. Headlights and instrument panel lights out. - 10/27/21 04:19 PM

I don’t have an account anywhere to post pictures.
I did not add any wires or splice into anything.

Please look at the video. This is what I did, but did not have to swap any wires.
The beginning is about modifying CV corners. Later, at about 3:55, he shows the GM corner swap.

Look at this video.
https://m.youtube.com/watch?v=7GcFFMGkTUM

The cornering lights were working as they were supposed to. Everything worked fine, except headlights. Replaced the burnt out fuse (27) then had headlights, but no longer had cornering lights. The only wire change was using the GM harness, as in the video.
If I pull fuse 27, the cornering lights work when the headlight switch is on and the turn signal on. So it is wired and getting power. But then no headlights.
Posted by: GM_Guy

Re: Help. Headlights and instrument panel lights out. - 10/27/21 06:26 PM

don't need an account with imgur. Just click "new post" up at the top left, upload picture, upload another and copy the links to here, be it the album itself, or individual photos.
Posted by: Florida_Mike

Re: Help. Headlights and instrument panel lights out. - 10/28/21 06:59 AM

Originally Posted By GM_Guy
don't need an account with imgur. Just click "new post" up at the top left, upload picture, upload another and copy the links to here, be it the album itself, or individual photos.

I looked at that on my iPad and iPhone. Do not see a “new post” button. Only get app. When I click that it, it takes me to IMGUR GIF and Meme Maker.
Posted by: Florida_Mike

Re: Help. Headlights and instrument panel lights out. - 10/28/21 02:43 PM

Here are pics of what I used.
1 connected harness, 2 and 3 Unmodified CV harness showing 4 wires and pins. , 4 and 5 GM harness.





Posted by: Florida_Mike

Re: Help. Headlights and instrument panel lights out. - 10/29/21 06:32 AM

What doesn’t make sense in this is that my 2004 Owner’s Guide says fuse # 27 is LCM for cornering lamps and high beam headlamps. Yet when the fuse is blown I have no headlamps at all (no high or low), but the cornering lamps work. With a good fuse I have headlamps but no cornering lamps.
Posted by: Florida_Mike

Re: Help. Headlights and instrument panel lights out. - 10/29/21 09:01 AM

According to this link,
https://fuse-box.info/mercury/mercury-grand-marquis-2003-2011-fuses-and-relay
The 2003 and 2004 GM fuse 27 is the same. I wonder what happens to the cornering lights on an 03 or 04 GM when fuse 27 is pulled.

If you read Quasar’s post in this thread, it supports what I’ve said.

https://www.crownvic.net/ubbthreads/ubbthreads.php?ubb=showflat&Number=2924917
Posted by: av8or1

Re: Help. Headlights and instrument panel lights out. - 10/29/21 11:54 AM

Based on this picture:


It would appear that your engine bay harness came with the wiring for the cornering lights. This picture is of your pax side, correct? As I recall the WH-LB is the turn signal, the BR-WH is the cornering light, the BR is the parking light and BK is ground. Did you look at the driver's side? As I recall VT-YE is the cornering light and LG-WH is the blinker, with parking and ground the same. Anyway it would appear that your harness is ok. It also looks like the pinouts in your fender connectors (4 wires) match the pinouts for the cornering light harness. Did you verify that? It appears to be the case but it is kinda difficult to determine that from these pictures.

Anyway, assuming that the wires match and that your engine bay harness has what it needs, now you need to verify that you have the wiring that runs from the firewall connector (C260) to the multifunction switch (C202C). One would presume that it is present, but until you verify you can't say for certain. As I recall the driver's side VT-YE should be at pin 1 and the BR-WH should be found at pin 3 in C202C. So let's start with that.

Also, do you have a diagram for your 2004 or are you just working off of videos and a CVN thread? The diagram is what you should be referring to, all else ... well it can be helpful but it can also lead you down a rabbit trail. I have 2006 diagrams that I referred to, as our LX Sport is a 2006, and what I know regarding the cornering lights is based off of those diagrams. So the real question is whether or not they changed in those two years. I rather doubt that it did, but you never know. What I do know is that Ford discontinued the inclusion of some of the relevant wiring sometime in 2005, which is why our engine bay harness didn't have the wiring that yours appears to have. Be thankful for that, otherwise you'd have to run the wiring yourself. In my case that was relatively easy because I had torn the car apart by that point in time. If you hadn't done that you would have had to dig for the engine bay harness, but I digress.

So if you could post pictures of the 2004 wiring diagrams it would help to verify any differences.

Finally, what is your configuration now? I presume that you have a set of GMQ side lights, which have both the parking and the cornering lights in them? Are you still running your CV headlights that have both the headlight and a turn signal light?
Posted by: Florida_Mike

Re: Help. Headlights and instrument panel lights out. - 10/29/21 12:49 PM

I don’t have a diagram. My current configuration is CV headlights with Marauder corners. So with the harnesses I’m using, I have a turn signal on both sides of the headlight. I assume the wiring from the firewall connector is there. Otherwise, how would it light at all. As I’ve said the cornering lights work when fuse 27 is pulled. But I will look at the connector.
Posted by: Florida_Mike

Re: Help. Headlights and instrument panel lights out. - 10/29/21 02:58 PM

Couldn’t find a diagram on line. Just ordered the Ford 2004 Crown Vic wiring book on EBay.
Posted by: av8or1

Re: Help. Headlights and instrument panel lights out. - 10/30/21 10:37 AM

Well I wouldn't get too bent around the axle regarding fuse 27 in your CJB. It doesn't matter what happens when it is INOP unless you want to go without headlights. 'Point being that there could be a reason other than what you have concluded for why your cornering lights illuminate when that fuse is INOP. Heck, the BR wire (which ultimately provides power to both the parking and cornering lights) is spliced downstream of the corner connectors (C1010 and C1019) and within the GMQ cornering light sub-harness. If a ground was being supplied on the other end, then the lights would illuminate for other reasons that could be related to the missing fuse. But it depends on the wiring that is present. I digress. As mentioned, it's kinda pointless to spend time investingating what happens when that fuse isn't working, so I won't address that again. Does your P73 have autolamps or CVPI headlamps? I suspect the latter, but that would be good to know.

And there is at least one difference between your 2004 and our 2006: fuse 27 for us is not the headlight/LCM but rather the DLC and power port/"cigar lighter". Anyway ...

Did you crack open your steering column and take a look at your C202C? It should look like this:


Finally, you stated that your cornering lights don't work when F27 is present. How did you test your cornering lights?
Posted by: Florida_Mike

Re: Help. Headlights and instrument panel lights out. - 10/31/21 08:25 AM

I got it working. I broke out the multi-meter and checked the MGM harness using this pin out.



I found the ground wire of the corner light socket was spliced to into the brown wire on pin 3 (parking) of the connector (as in image below) instead of pin 1 (ground). Spliced it, instead, to the black wire on pin 1 wire. It works now.

In the image below pins 1 & 2 are at the top of the connector and the spice is on the brown wire it pin 3.



I guess with the way it was wired, when fuse 27 was out, the cornering lamp got power from the parking light wire and found its way to ground through the MFS when turning on the turn signal
Posted by: av8or1

Re: Help. Headlights and instrument panel lights out. - 10/31/21 12:37 PM

Yup, that would do it. As I mentioned, it was getting ground from somewhere. No way to know that this was the cause unless you tore apart that harness. This is where I would have headed next...

Glad that you were able to fashion a successful repair. Congratulations!
Posted by: Florida_Mike

Re: Help. Headlights and instrument panel lights out. - 10/31/21 05:02 PM

The youtube video I posted earlier mentioned swapping pins 1 & 3, but I wasn’t feeling that was the way to go.