LCD Dash Out


Information and questions on GL1200 Goldwings (1984-1987)
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rdraidr
Posts: 75
Joined: Fri Aug 19, 2011 7:02 am
Location: Roswell, New Mexico
Motorcycle: 1987 GL1200A

LCD Dash Out

Postby rdraidr » Fri Jun 22, 2012 10:58 pm



So I just about have the bike all together. Running smooth after I sync'd the carbs, etc. Go to turn it on the next day and the entire LCD dash is out. It has power; lights are on, but no tach, speedo, temp, pressure, etc. All at once? So I'm thinking it's a fuse, but they are all good. Bike starts up and runs fine. I've looked for loose connections. I've even taken the light out and checked the connections at the back of the panel. Any ideas?

Thanks.



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virgilmobile
Posts: 7663
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: LCD Dash Out

Postby virgilmobile » Sat Jun 23, 2012 9:32 pm

Release and wiggle the plugs on the faring by the left pocket.There are a bunch of wires in there.My interstate lost backlights and one connection was corroded.
Have a look at this...viewtopic.php?f=5&t=11905

rdraidr
Posts: 75
Joined: Fri Aug 19, 2011 7:02 am
Location: Roswell, New Mexico
Motorcycle: 1987 GL1200A

Re: LCD Dash Out

Postby rdraidr » Sun Jun 24, 2012 7:07 am

Thanks for the reply and associated posting. I spent all afternoon trying to trace the issue out. I particular, I was trying to identify the magic wire that feeds power to the LCD for the backlighting. Just to be clear, the face is blank; can't see anything in daylight. The bulbs that light up for highbeam, red bar on the bottom, ODO, etc. are all on. The plugs you show are similar to what I have and I cleaned them but good and added the dielectric grease; been doing so to every plug.

One question, what shop manual are you using? Clymers? Haynes? The Haynes I have does not have a very good wire diagram.

Thanks.

rdraidr
Posts: 75
Joined: Fri Aug 19, 2011 7:02 am
Location: Roswell, New Mexico
Motorcycle: 1987 GL1200A

Re: LCD Dash Out

Postby rdraidr » Sun Jun 24, 2012 7:38 am

I believe I've figured out you have a Clymers and the diagrams you've posted on other threads looks a lot clearer than the Haynes. So, the first question is where is the best place to get a Clymers and is there an E-version?

Second question is from one of your other postings. Which wire on a 87 Aspy would be the back-light wire per your Clymers? I've been hunting a fuse listed in the Haynes as a 3A on a red wire. But, I've found a few errors from the manual versus my bike, so I'm not sure I trust it. Just don't recall such a fuse.

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virgilmobile
Posts: 7663
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: LCD Dash Out

Postby virgilmobile » Sun Jun 24, 2012 8:20 am

All the Information I have has come directly from the "manuals" section on this web site in PDF form.I downloaded everything.I use a combination of info from all of them.I even get details from a different year model to work on mine.Sometimes Honda uses the same ideas over many models.
I'll look a bit closer at the schematic to locate a few test points. From theory only,a LCD that is completly out would be missing either ground,comtinous 12 volts or switched volts.
These can be color coded off the schematic and located at the LCD main harness plug.

rdraidr
Posts: 75
Joined: Fri Aug 19, 2011 7:02 am
Location: Roswell, New Mexico
Motorcycle: 1987 GL1200A

Re: LCD Dash Out

Postby rdraidr » Sun Jun 24, 2012 4:01 pm

I did find a 3A fuse in the left side, below all the connections for the radio. It was on the red wire circuit that feeds several items up front to include the LCD. I replaced it, but no change to the LCD. :cry:

I'm with you on the connection or ground, but all circuits at the LCD connector that are supposed to be grounded are and those that are not, aren't.

One odd thing is the "parking" fuse only shows .06V in any situation (Ig. on or off). Does not appear to be related.

I need to be looking for a switched power via the ignition switch.

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virgilmobile
Posts: 7663
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: LCD Dash Out

Postby virgilmobile » Sun Jun 24, 2012 5:15 pm

To quick verify your theory.you can turn on the key and "apply"12volts to the dead circuit to see if the LCD comes back to life before you attack the ignition switch.

rdraidr
Posts: 75
Joined: Fri Aug 19, 2011 7:02 am
Location: Roswell, New Mexico
Motorcycle: 1987 GL1200A

Re: LCD Dash Out

Postby rdraidr » Sun Jun 24, 2012 7:22 pm

There are three plugs into the back of the LCD. I traced a red wire to one of them that is 12V constant to the LCD and shares power with the radio and clock. I found the 3A fuse and replaced that one, but the LCD did not come back on. Not a suprise really, as the issue has to be associated with a switched power, not constant power.

So, I'm trying to find the wire that powers the LCD back lighting, not the indicator bulbs.

rdraidr
Posts: 75
Joined: Fri Aug 19, 2011 7:02 am
Location: Roswell, New Mexico
Motorcycle: 1987 GL1200A

Re: LCD Dash Out

Postby rdraidr » Sun Jun 24, 2012 9:23 pm

OK. Solved it. To help others who may run into the circumstance, if you have the LCD out, you should look for a black/brown wire. It runs through the ign. switch to two of the plugs at the back of the LCD. It runs through the fuse panel, fuse labeled, "METER". My fuse was connected, but bad, so full voltage was not getting through. I replaced the fuse and all is well.

Hope this helps someone else.

Thanks.




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