'94 GL1500A air compressor not working


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84wingrider
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'94 GL1500A air compressor not working

Postby 84wingrider » Sun Apr 08, 2012 7:51 pm



Hey guys. I just bought a '94 GL1500 Aspencade with a non-working air compressor. Fuse is good and i swapped 20amp relays which were good. When hitting P. Check, the line pressure indicates on the dash and that's all. (Yes, i'm hitting P. Check and increase at the same time lol.) The outlet button and increase/decrease do not work. No relay clicks. I took the switchblock off the bike and removed the switches from the block. This is where i'm stumped. I took the increase/decrease rocker switch apart and the contacts looked new. The P. Check/outlet buttons are a little more complex since it's pushbutton and not a rocker switch. Obviously there is power going in and out of the P. Check button, but that's where it stops. I'm not getting any power to the outlet button or the increase/decrease switch. What has me stumped the most is there is a black/yellow wire that runs from the outlet button to the increase/decrease switch. That's where the increase/decrease switch gets its power. From the 6 pin plug, the only 12v i'm getting is thru a small green wire, which runs to only P. Check. I'm assuming this is the only 12v going to the entire switchblock. I don't understand why or how the outlet button is supplying 12v to the increase/decrease switch. I think i'm close to solving this, but i don't want to go buy an expensive switch just to find out that's not the culprit, plus i'm afraid of breaking the outlet button if i tear it apart. Not sure if it's the button contacts or not since the rocker contacts were so clean. The guy i bought the bike from said he never used the air switches. Sorry to be so long winded here, but i thought i would try to explain this in detail. Any help would be greatly appreciated. Are these switches notorious for going bad? I had an '84 i just sold and they still worked (although they're much different).



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Re: '94 GL1500A air compressor not working

Postby virgilmobile » Mon Apr 09, 2012 7:46 am

I'll look over the schematic today and get you some test points.You may also download the service manual and all the pdf files you can get your hands on.Freebies obviously.Under the manuals section.

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Re: '94 GL1500A air compressor not working

Postby virgilmobile » Mon Apr 09, 2012 12:03 pm

I'm in the field for a while.in the mean time.with the key on,etc,when you push the p button,do you hear #5 relay click?it should.I think it's in the relay box on the left side under the cover.

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Re: '94 GL1500A air compressor not working

Postby WingAdmin » Mon Apr 09, 2012 12:32 pm

I had the same problem when I got my 1500, and I seem to remember that it turned out that running the compressor to the outlet sourced power through a different fuse than running the compressor to the suspension. When I replaced the applicable fuse, it fixed the problem.

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Re: '94 GL1500A air compressor not working

Postby 84wingrider » Mon Apr 09, 2012 2:20 pm

Thanks Wingadmin and Virgilmobile. There are no relay clicks whatsoever. Wingadmin, i'm not sure what you're saying here. I'm gonna try to supply the switch with 12v and leave the switch unplugged from the harness to see if i can figure out why i'm not getting 12v past the P. Check switch. By leaving it unplugged from the bike, this will prevent blowing a fuse or worse lol. I will repost later tonite if i figure anything out. This thing has me stumped. Thanks for the advice, and please don't be afraid to add more lol.

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Re: '94 GL1500A air compressor not working

Postby virgilmobile » Mon Apr 09, 2012 2:35 pm

I'll post the schematic in a bit.the relay# 5has to click.it's the main relay for power to the rest of the circuit.

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Re: '94 GL1500A air compressor not working

Postby virgilmobile » Mon Apr 09, 2012 3:02 pm

Here's the schematic and test points.Again,the relay #5 must click on when the p check button is pushed and held to provide power for the rest of the circuit.Another relay next to it may be substituted for testing.

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Re: '94 GL1500A air compressor not working

Postby 84wingrider » Mon Apr 09, 2012 3:41 pm

I substituted a relay last night with the same amp rating (20a). All relays still dead. Also, the green/yellow wire is always dead, no power even when p. check is not pushed. Not sure why.

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Re: '94 GL1500A air compressor not working

Postby virgilmobile » Mon Apr 09, 2012 4:20 pm

Good testing so far.At least you identified the area to look at.
The g/y wire does not get volts from the LCD module.
The green/yellow wire that goes to the display is electronically switched to ground by the display module.That wire gets 12 volts from the coil in the relay,and then grounded to make it click by the LCD module.
so when the relay is in the circuit,that wire should have 12 volts on it all the way to the display module.
If there is none,either the relay doesn't have 12 volts going to it or there is a break in the wire from the relay to the LCD.
I'd be more inclined to believe that the relay doesn't have 12 volts to it.
Pull the relay out,turn on the key,there should be 2 terminals that have 12 volts on them.One for the coil and one for the contact.
Each one has a separate fuse too.

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Re: '94 GL1500A air compressor not working

Postby 84wingrider » Mon Apr 09, 2012 4:27 pm

I checked the relay before i even read your post just now. It has a constant 12v with key off, then another terminal (out of the 4) turns hot when the key is turned on. I even swapped it out with yet another known good relay. There is no change in state when the p. check button is pushed, the same 2 terminals remain hot, but the other 2 remain without power. This is getting aggravating.

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Re: '94 GL1500A air compressor not working

Postby virgilmobile » Mon Apr 09, 2012 5:59 pm

The coil part of the relay has 12 volts,so the g/y wire that leaves the relay must also have 12 volts on it when the relay is connected.The LCD is what grounds this wire to click the relay.If you can find that wire in the harness that comes out of the relay box,it can be tested for volts there.if it has volts,ground it and the relay should click and let you operate the compressor.that g/y wire should go all the way up to the LCD module.
If the g/y wire has no volts with the key on and the relay in,there is a connection problem in the box.

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Re: '94 GL1500A air compressor not working

Postby 84wingrider » Mon Apr 09, 2012 7:02 pm

Ok Virgil, here we go. So far your advice has been dead on and golden. I pulled the left saddlebag and accessed the green/yellow wire by removing the fuse/relay block from the frame and pulling the cover off the back, exposing all the wires. No power to the g/y wire, so i grounded it from the backside of the relay. The relay tripped, and i was able to run the compressor, which added air to the shocks. So, you're saying the g/y wire is broken somewhere between the relay block and the LCD? This is where i hope you're wrong lol. Not sure if i'll be able to continue the teardown if this is the case. I thought about adding a small (hidden) toggle switch to short the relay when i want to increase/decrease air in the shocks, but that's a jury rig for sure. I'm not sure where to go from here.

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Re: '94 GL1500A air compressor not working

Postby virgilmobile » Mon Apr 09, 2012 7:34 pm

As you said,grounding the g/y wire on the back of the relay box gets it going.
That wire goes straight to the same color code on the LCD module.
You can try to ground it there too or check continuity on that wire.
Remember the g/y wire only has volts on it when the key is on.The design is that the relay has volts on it with the key and the LCD module is the ground switch.
Kinda backward of how you would wire up a relay.You know,you would ground the relay and then apply volts to energize it.
So the next step is to verify continuity from the relay contact all the way to the plug on the LCD.Or you could bypass it just to test the LCD operation.It is possible that the electronic switch inside it is bad.

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Re: '94 GL1500A air compressor not working

Postby 84wingrider » Mon Apr 09, 2012 8:04 pm

Virgil you may have guessed it again on the last line of your previous post. The switch inside the LCD may be bad because the LCD screen is beginning to de-laminate (i guess that's how to describe it). It is beginning to turn purple from the left side. Not sure why, but was like that when i bought it. I thought LCDs did that due to some sort of impact, but i don't know. This bike has never been down or damaged. I think for now, i'm just gonna use a (hidden) toggle switch to short the air relay. In the meantime, i'm looking for a used replacement LCD. Not cheap! When i replace the LCD, i'll then disable the toggle switch and see if the air circuit works then. Again i appreciate the (CORRECT) advice you've given these past couple of days. It's people like you, Wingadmin, and many others that make this site what it is. I never would have figured this one out on my own. If you think of anything else, post it! Thanks again!

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Re: '94 GL1500A air compressor not working

Postby virgilmobile » Mon Apr 09, 2012 8:20 pm

Don't get too excited yet.
A toggle switch will get you going but I doubt that the ugly LCD is the cause of the problem as it's only the display for the control module.
Now if the entire assembly has been compromised and is corroded,then yes,it may be it.
The only way to verify for sure is to ground the wire right on the module itself to see if it will operate the pump.
If it works there,then a repair or replacement is in order.
Come to think of it,I've never looked at the reflector for a LCD to see if it's replaceable.
Hmmm,something to look into i guess.In my spare time. :)

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Re: '94 GL1500A air compressor not working

Postby 84wingrider » Tue Apr 10, 2012 3:41 am

Let me know if the reflector is replaceable...although i doubt we can buy JUST that part thru Honda! Thanks again, Virgil!

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Re: '94 GL1500A air compressor not working

Postby WingAdmin » Tue Apr 10, 2012 3:01 pm

Once the LCD had started to delaminate (that's what you're seeing on the side), it's history. You'll need to replace it.

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Re: '94 GL1500A air compressor not working

Postby noeleo » Tue Apr 10, 2012 3:17 pm

84 WINGRIDER,

At the risk of me saying something silly, in the original post you mentioned the button labeled "outlet". You do remember that this ONLY functions with the key in the "park" position, right? I thought my outlet function was not working, but suddenly remembered from my 87A that the key had to be as such before operation. I know, only I could make that mistake. :D :D
I really would like to know what you find in case mine craps out. Thanks for this topic. Learning more each day...
Ride your GoldWing no faster than your angel can fly.

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Re: '94 GL1500A air compressor not working

Postby virgilmobile » Tue Apr 10, 2012 4:13 pm

WingAdmin wrote:Once the LCD had started to delaminate (that's what you're seeing on the side), it's history. You'll need to replace it.


Sounds about right.
I looked at a good monochrome lcd and I found that the silver reflective material on the back is a polarizing sheet with silvering on the back of it and then another protective layer over it.
The front sheet is slightly green tinted and is a polarizing sheet also.
So i suppose the only way to fix one would be to find a donor lcd of the same or larger size,remove the rear plastic sheet and fit it to the bad lcd.
Well,only if a replacement can't be found would I even attempt this.Quite a bit of breakable thin glass there.

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Re: '94 GL1500A air compressor not working

Postby virgilmobile » Tue Apr 10, 2012 4:57 pm

Ya know,I was just thinking.IF it's just the silvering that's peeling off, you could remove the rest of it and paint it with cheap silver paint?
I'll experiment and find out

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Re: '94 GL1500A air compressor not working

Postby 84wingrider » Tue Apr 10, 2012 6:30 pm

Hello again guys. Noeleo: I did not know the key had to be in the "park" position for the outlet button to function. Well, i guess you could say i cheated a bit on the repair of the air system. I took the easy way out and added a toggle switch (concealed in the front right compartment) running straight to ground, shorting the #5 relay when turned on. I just fininshed putting the bike back together and now have a functional air compressor. If anybody comes across an LCD, please let me know. I'm on a tight budget and can't shuck out a whole lot for it. Virgil: If i had your skillset, i would probably make an attempt to fix my LCD by using silver paint as you described. I know NOTHING about LCD other than the fact that it's very fragile. Soon i'm gonna post a want ad in the classifieds for a good used screen. Is it common for these to go bad? When i went to look at the bike, seeing the screen as is was almost a deal breaker for me....but the bike sure did run good lol. I wanna thank Virgil and everybody again for the advice and staying with me on this post.

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Re: '94 GL1500A air compressor not working

Postby virgilmobile » Tue Apr 10, 2012 9:37 pm

I've read about a few LCD problems,however,remember that just the display is just that.it only displays what the control module sends to it.your compressor problem is not related to the unreadable display, it's either in the wiring or the control module corroded.
Oh,I did see one on Steal-Bay for (cough,cough) $325.
Kinda makes it worth living with what you have.
I'll experiment on a LCD from a junk radio I have to see what can be done to them and take pix of the results.
I'm hoping that displays like you have that have been compromised may be repaired rather than just replaced.

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Re: '94 GL1500A air compressor not working

Postby 84wingrider » Wed Apr 11, 2012 2:42 pm

Thanks again, Virgil. If you come up with a solution, please advise on this forum...that way i will get an email notification of a new post lol. I think there are a few others interested in this post also, not just us! Thanks again!

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Re: '94 GL1500A air compressor not working

Postby virgilmobile » Thu Apr 12, 2012 2:20 pm

84wingrider wrote:Thanks again, Virgil. If you come up with a solution, please advise on this forum...that way i will get an email notification of a new post lol. I think there are a few others interested in this post also, not just us! Thanks again!


I've been tearing apart a working LCD just to see,and what I really need is anybody that has a LCD problem with this " de-laminating" problem to post a good pix of it with the LCD turned on.
With this,I can determine which layer is bad and how(if possible) to fix it.
The LCD is a Transflective liquid crystal display type and has a front polarizer,the glass layers,a rear polarizer and a reflector on the back.
I'm thinking a broken laptop screen could be a donor if the polarizer is bad.

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Re: '94 GL1500A air compressor not working

Postby WingAdmin » Thu Apr 12, 2012 4:08 pm

Normally when you start seeing the black "leaking in" from the side of an LCD, it's because the seal between the glass layers has been breached, not a problem with the polarizer layer (which is usually just a plastic sheet). There's no real way to fix that.




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