Moonroof issues
Moonroof issues
Alright, so I've been working on the black CL, trying to finish up the automatic conversion. I'm close to finishing. Motor and transmission are in, brakes are bled after swapping the lines, keys programmed. Starts up and runs smooth, no issues there. Blah blah blah 
Now the car is definitely a fixer upper, but not for me. The car has some things it needs done, like new tires, brakes & rotors, so on and so forth. I'm trying to minimize the amount of easy issues so I can get as much money as I can selling this thing. One of the issues is the moon roof. I can't seem to figure out what's going on, and I can't seem to find any threads pertaining to my issue, especially on the 2g CL or TL side. Kinda bizarre.
Here's the issue: I can open the moon roof just fine. However, it will not close, nor will it tilt. Manually cranking it closed, and into the tilt position, however, the close button WILL work. But ONLY for the tilt position. The relays behind the driver's wheel are clicking for all of the buttons when pushed, when the moonroof is in it's respective position of course. So it's not the switch itself. I've already opened up the switch, inspected pins, cleaned up all the contacts, reheated the solder on the joints, and that did nothing.
I'm sort of at a loss as where to look next. Being that this is one of my favorite features, I'd really hate to sell it with it not functioning properly. I'm beginning to think that a wire got pinched/broken when swapping the interior harnesses. If that's the case, then fuck it. I'm not removing the dash again.
So where do I look next?

Now the car is definitely a fixer upper, but not for me. The car has some things it needs done, like new tires, brakes & rotors, so on and so forth. I'm trying to minimize the amount of easy issues so I can get as much money as I can selling this thing. One of the issues is the moon roof. I can't seem to figure out what's going on, and I can't seem to find any threads pertaining to my issue, especially on the 2g CL or TL side. Kinda bizarre.
Here's the issue: I can open the moon roof just fine. However, it will not close, nor will it tilt. Manually cranking it closed, and into the tilt position, however, the close button WILL work. But ONLY for the tilt position. The relays behind the driver's wheel are clicking for all of the buttons when pushed, when the moonroof is in it's respective position of course. So it's not the switch itself. I've already opened up the switch, inspected pins, cleaned up all the contacts, reheated the solder on the joints, and that did nothing.
I'm sort of at a loss as where to look next. Being that this is one of my favorite features, I'd really hate to sell it with it not functioning properly. I'm beginning to think that a wire got pinched/broken when swapping the interior harnesses. If that's the case, then fuck it. I'm not removing the dash again.
So where do I look next?
Last edited by Thefireball; Dec 4, 2023 at 02:57 PM.
- Fuse is good.
- Limit switch, doubt it, and don't feel like peeling back the liner to find out.
- Not the battery
- Defective motor, doubt it. Doesn't whine or struggle at all. Even tried using my own strength to close and try to open for tilt. Nothing.
- Relays click
I also just discovered that the driver's power seat isn't working. Can't slide or tilt. The passenger's works though. Might be related?

Maybe a connector is not push all the way in?
So a bit of an update:
- Driver power seats work
Turns out, I left two plugs unplugged under the seat that go into that black box. Woops
- I found two ground harnesses left unbolted. One under the hood below the fuse box, which was causing a light, and one to the right of the passenger fuse box. Both have been bolted down aaaaaand.. the moon roof still does not work.
- I discovered that the passenger window does not roll down, regardless of whether I use the driver or passenger side switches. I checked the switch that locks that window, and that didn't make a difference. There is no relay click for the passenger window click when hitting the switch, but there is one for the driver side.
I have since tried:
- Swapping moon roof switches; still no change
- Testing the limit switch per the service manual; all good there
- Supplying power via a Ryobi battery directly to the moon roof motor; it opens & closes perfectly fine
- Probed the motor plug for power; gets 12V when hitting the open & close switch, but nothing when hitting the tilt switch, regardless of the position of the roof window.
- Checked both relays behind the steering wheel, and they both click for Open & Close, but nothing for tilt.
- Check the power window relay on the passenger fuse box; works as intended when given power, but nothing when hooked up.
I have checked every ground related to the moon roof, even testing continuity of the ground wire itself on the switch, and they're all good. I checked all of the plugs going to the fuse box itself, and all wires seem to be in place. However, I didn't realize that the moon roof circuit diagram was different from the one in the service manual. So I'm hoping to try testing the continuity on that blue/black wire later.
I'm running out of places to look and things to try. About to say screw it and just leave it be. I want this car outta here already.
- Driver power seats work
Turns out, I left two plugs unplugged under the seat that go into that black box. Woops
- I found two ground harnesses left unbolted. One under the hood below the fuse box, which was causing a light, and one to the right of the passenger fuse box. Both have been bolted down aaaaaand.. the moon roof still does not work.
- I discovered that the passenger window does not roll down, regardless of whether I use the driver or passenger side switches. I checked the switch that locks that window, and that didn't make a difference. There is no relay click for the passenger window click when hitting the switch, but there is one for the driver side.
I have since tried:
- Swapping moon roof switches; still no change
- Testing the limit switch per the service manual; all good there
- Supplying power via a Ryobi battery directly to the moon roof motor; it opens & closes perfectly fine
- Probed the motor plug for power; gets 12V when hitting the open & close switch, but nothing when hitting the tilt switch, regardless of the position of the roof window.
- Checked both relays behind the steering wheel, and they both click for Open & Close, but nothing for tilt.
- Check the power window relay on the passenger fuse box; works as intended when given power, but nothing when hooked up.
I have checked every ground related to the moon roof, even testing continuity of the ground wire itself on the switch, and they're all good. I checked all of the plugs going to the fuse box itself, and all wires seem to be in place. However, I didn't realize that the moon roof circuit diagram was different from the one in the service manual. So I'm hoping to try testing the continuity on that blue/black wire later.
I'm running out of places to look and things to try. About to say screw it and just leave it be. I want this car outta here already.
Last edited by Thefireball; Dec 11, 2023 at 05:13 PM.
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Figured it out. It's 100% my fault, and I'm holding true to the title under my name.
I first started checking the voltage on the wires that run along the pillar to the limit switch. I had noticed when the moon roof was tilted, or was it closed I don't remember, that there was 12V on all 3 wires from the roof switch to the limit switch. I figured that couldn't be right. I then decided to check the roof 2 wire plug for power. Probing each wire individually and grounding to body, I noticed that each wire was getting 12V at the same time when hitting the switch. One wire is supposed to get power, while the other grounds, flipping polarities to open & close. I then started looking at the circuit diagram, and started thinking maybe it was the relays?
Sure enough, it was. I had one black & one grey relay. I took out the grey, and put in another black, and then.. the moon roof stopped working completely. Then I swapped two grey relays in, and boom, everything worked as it should.
At least I learned how to read circuit diagrams after all of this lol. I swear, looking at those things hurts my head. Must be what having dyslexia feels like.
As for the passenger power window, well, I guess I left it unplugged. I don't remember pulling that door panel off, but I guess I did at some point.
I first started checking the voltage on the wires that run along the pillar to the limit switch. I had noticed when the moon roof was tilted, or was it closed I don't remember, that there was 12V on all 3 wires from the roof switch to the limit switch. I figured that couldn't be right. I then decided to check the roof 2 wire plug for power. Probing each wire individually and grounding to body, I noticed that each wire was getting 12V at the same time when hitting the switch. One wire is supposed to get power, while the other grounds, flipping polarities to open & close. I then started looking at the circuit diagram, and started thinking maybe it was the relays?
Sure enough, it was. I had one black & one grey relay. I took out the grey, and put in another black, and then.. the moon roof stopped working completely. Then I swapped two grey relays in, and boom, everything worked as it should.
At least I learned how to read circuit diagrams after all of this lol. I swear, looking at those things hurts my head. Must be what having dyslexia feels like.
As for the passenger power window, well, I guess I left it unplugged. I don't remember pulling that door panel off, but I guess I did at some point.

That's why I take pictures of EVERYTHING before an attempted DIY project, just in case.
No matter how exhausting or extensive it may be, car repairs, home electrical, plumbing, structural, appliance electronics et al.
Over the years, they have saved me thousands of $$$$ and lost strands of hair on the ole scalp, lol.

Gotta fix the IACV first, maybe get a door handle, waiting for the new driver side window regulator, maybe get a new latch for the arm rest because it's broken and just stays standing up, and then fix the rear taillight being flooded with water, clean up the head lights, clean out the interior, give it a good washing, THEN the for sale sign.


That's why I take pictures of EVERYTHING before an attempted DIY project, just in case.
No matter how exhausting or extensive it may be, car repairs, home electrical, plumbing, structural, appliance electronics et al.
Over the years, they have saved me thousands of $$$$ and lost strands of hair on the ole scalp, lol.

Funny thing is, I removed the relays from the black CL when I was having moon roof issues on my blue CL. But that was just because I mixed up the main relay plug, because there's two of those brown plugs that are the exact same design.
At the very least, I hope this thread helps any one who might be having issues with their moon roof. When I was looking up threads, all I could find were threads for the 3G TL, and some MDX. Funny how issues with the roof seem to be prevalent with the 3G compared to the 2Gs.
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dmbfan36_23
1G TSX (2004-2008)
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Aug 8, 2005 09:24 AM









