Turn Signal Brain Teaser


Information and questions on GL1800 Goldwings (2001-Present)
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TunnelVision1
Posts: 1
Joined: Thu Jan 08, 2015 1:34 pm
Location: Melbourne, Florida
Motorcycle: 2002 GL1800
1977 GL1000

Turn Signal Brain Teaser

Postby TunnelVision1 » Thu Jan 08, 2015 2:59 pm



Have 02 1800. Turn signal works for 30sec to 60sec, then quits. (Lft. Rt. Cancel at switch) After an hour to 1.1/2 hour they work again 30 - 60sec. (Motor running or not) Have checked all relays, both ohm & volt. Have swapped relays, no result change. Tested diode (good) Removed white/blk wire from main connector (grey) as per U-tube bulletin. Local Honda dealer replaced turn signal switch & housing, all controls lft handle bar. Worked 2 times until I got home, at stop, before turning into drive, blinked 2-3 times & quit. ( went back to beginning) Jumped Blu/Blk (Blu/Gr) to Grnd., Turn signals work continuously for as long as I leave them on. (Cancel eliminated with grnd.) Seems like relay or diode heating, but by the time I can pull & check, all ok. Just for grins, checked all connector grnds.(no change) Radio & Aux. no problems. All other guages & functions are working fine. As a Master Marine Tech., can't see forest for the trees. Need another brain to open my eyes! Second question; if all else fails, will permanently grounding Blu/blk wire at flasher cause damage else where?



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WingAdmin
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Re: Turn Signal Brain Teaser

Postby WingAdmin » Thu Jan 08, 2015 4:52 pm

TunnelVision1 wrote:Have 02 1800. Turn signal works for 30sec to 60sec, then quits. (Lft. Rt. Cancel at switch) After an hour to 1.1/2 hour they work again 30 - 60sec. (Motor running or not) Have checked all relays, both ohm & volt. Have swapped relays, no result change. Tested diode (good) Removed white/blk wire from main connector (grey) as per U-tube bulletin. Local Honda dealer replaced turn signal switch & housing, all controls lft handle bar. Worked 2 times until I got home, at stop, before turning into drive, blinked 2-3 times & quit. ( went back to beginning) Jumped Blu/Blk (Blu/Gr) to Grnd., Turn signals work continuously for as long as I leave them on. (Cancel eliminated with grnd.) Seems like relay or diode heating, but by the time I can pull & check, all ok. Just for grins, checked all connector grnds.(no change) Radio & Aux. no problems. All other guages & functions are working fine. As a Master Marine Tech., can't see forest for the trees. Need another brain to open my eyes! Second question; if all else fails, will permanently grounding Blu/blk wire at flasher cause damage else where?


Looking at the schematic, the Blue/black wire goes through the diode, and from there to the turn canceler unit, to provide ground. Here's what to do:

The next time it stops working properly, find the diode, with its three-position white connector. Using a paperclip or a small piece of wire, short the Blue/green and Blue/black wires on the diode connector. If it starts working, then the problem is likely a bad diode - and my guess this is what it's going to be. If the diode is failing, it can heat up and start providing enough resistance that the flasher doesn't have enough current to operate.

If doing this test does not fix it, the next thing to do is press the Hazard button. This also grounds the blue/green wire. If the lights start flashing then we know the wiring up to at least that switch is OK.

Last, test the turn canceler itself. There are two connectors along the way: a 6 pin grey and a 7 pin green. At the 7 pin green, ground the Blue/black wire. If your light starts flashing, then the problem is with the turn canceler - either with the canceler itself, or with one of its inputs.
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Turn Signal Circuit
Turn Signal Circuit

Len
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Re: Turn Signal Brain Teaser

Postby Len » Sat Jan 10, 2015 11:10 pm

I had a similar problem after a dealer replaced the left handlebar control on a friend's bike. The 7 pin connector between the new control unit and the cancel unit (located in the steering stem) was wired incorrectly from the factory. Some of the leads were connected to the wrong pins in the connector. The dealer had this bike in the shop for five months without finding the problem. The dealer gave up and sent the owner away after charging him hundreds of dollars for the control unit and the time spent trying to fix the problem caused by the defective part. We located the trouble in just a few hours, and my friend is back on the road.

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WingAdmin
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Posts: 17050
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: Turn Signal Brain Teaser

Postby WingAdmin » Mon Jan 12, 2015 11:21 am

Len wrote:I had a similar problem after a dealer replaced the left handlebar control on a friend's bike. The 7 pin connector between the new control unit and the cancel unit (located in the steering stem) was wired incorrectly from the factory. Some of the leads were connected to the wrong pins in the connector. The dealer had this bike in the shop for five months without finding the problem. The dealer gave up and sent the owner away after charging him hundreds of dollars for the control unit and the time spent trying to fix the problem caused by the defective part. We located the trouble in just a few hours, and my friend is back on the road.


Unfortunately, this is more and more common. Dealer service areas do far less diagnosing of problems, and instead do "diagnose-by-random-part-replacement" - at the owner's cost.




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