Cruise control won't set above 50mph

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Cruise control won't set above 50mph

Post by raevans » Mon Nov 28, 2011 3:21 am

GL1500 1997 Japanese import - I cannot get the cruise control to work above 50mph. I works fine below this speed. Does anyone have any idea where the problem is. Had it to mechanics, but they have never heard of this before.

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Re: Cruise control won't set above 50mph

Post by virgilmobile » Mon Nov 28, 2011 9:30 am

This post,confusing as it may appear,should relate to your problem...viewtopic.php?f=6&t=6946

I believe the computer is factory set to operate within a defined speed range.I also think that they forgot to convert from KPH to MPH in the cruise limit map.
You may be able to trick the computer to an acceptable range.... ... f=6&t=2789

Other info can be found by typing in...gl1500 the search space at the top of the page.There are plenty of posts about it.

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Re: Cruise control won't set above 50mph

Post by Okayamapiper » Wed Jan 11, 2012 8:37 am

Hello from Japan. Japanese highways back in the 90's had a max speed limit of 80km/h so the cruise control computers have a limiter which stops you at 50mph (80km). The most effective cure for this problem would be to replace the cruise control computer with a US version. There are a lot of them up on ebay.

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Re: Cruise control won't set above 50mph

Post by vtxcandyred » Fri Jan 13, 2012 9:19 pm

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Re: Cruise control won't set above 50mph

Post by WingAdmin » Sat Jan 14, 2012 1:58 pm

That image looks very small and unreadable - but I copied it from (I think) the original source here:

For the past 13 years - ever since its introduction - riders have been looking for a way to extend the maximum speed at which the cruise control could be set. The efforts that I'm aware of approached the problem with the thought of "fooling" the cruise control unit into "thinking" that the bike was going slower than it actually was.

After hearing a few trike owners comment that their maximum cruise control setting was different - lower - than a stock Wing's, and that the final drive gear ratio was normally changed to give the trike more power to pull the extra weight, I did some digging in the shop manual and found that

1) My 95 Aspencade's Cruise Control sensed engine speed as well as road speed, and

2) There were inputs to the Cruise Control from 4th and 5th gear positions.

Sure, the fact that there was still input from the speedometer meant that road speed could still be the determining factor, and, since the Cruise Control will only work in 4th and 5th gears, the inputs could merely be giving the CC that information, but -- more tests were in order.

First, I determined, by road test, that ~80 mph CC limit was the same in both 4th and 5th gear. I also noted that the actual (GPS indicated) speed was always 78 mph, while the speedometer would indicate between 78-81 mph on any given ride, although the engine RPM was always the same. I took this as another indication that engine speed, not road speed, was the determining factor for maximum cruise speed.

It now appeared that the solution to the problem could be to try to make the CC think that the transmission was in 4th gear, although it was actually in 5th. Now, how to do this. Examining the manual (see diagram) showed the color code of the wires inputing the transmission sense into the cruise control, and also showed a connector - C33- where these wires could be accessed after inputs had gone to the engine control system. After all, I only want to fool the Cruise Control, and not the engine control module.

The picture (below) shows where this connector is located. The picture was taken by someone standing in front of the right saddle bag; the shiny black surface in the lower right of the picture is the front of the rear fender. Even though the picture caption states that the trunk is removed , as you can see by the location of the shock, it's only necessary to remove the seat to get to it.

For the test, I merely cut the red/white and green/orange wires, and cross connected them, so that the CC thinks the transmission is in 4th when it's really in 5th, and 5th when it's really in 4th. Now for the road test! I set the cruise control in 4th gear and tapped up to increase the speed. Sure enough, 65 mph was as high as it would set. Shifting into 5th, I reset the cruise and, again, started tapping up to increase the speed. 75... 78... 80... 85! Yes! and 90 mph. The cruise control maintained 90 mph as well as it used to maintain 75. I figure that it will set up to 100 mph and 4500 rpm (which is 80 mph in 4th gear.)

I know that it works on a 95, and I'll be trying it on a 96 in the next few days. I believe that it will work on any GL1500 that senses engine speed with the cruise control. For now, I think I'll leave the wires crossed; I don't foresee a reason to want to use the cruise control above 65 mph in 4th gear. A couple of other ways that should work, and that I may try later are:

1) Cut both wires, connect the red/wht wire (4th gear) from the cruise control to ground, and leave the other wire disconnected - I could then engage the cruise in any gear up to what ever speed 4500 rpm is, or

2) Cut both wires, leave the grn/org wire to the cruise control disconnected, and connect both wires from the shifter to the red/wht wire coming from the cruise control using a diode in each wire with the cathodes away from the cruise control. I could then set the cruise control up to 80 mph in 4th gear and 100 mph in 5th.

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Re: Cruise control won't set above 50mph

Post by Chronos70 » Wed Nov 02, 2016 10:19 am

I know this topic is like 4 years old but I thought I would put my two cents worth in. My '99 Goldwing SE has leather covers on the clutch and the brake handles with leather streamers hanging off. They create drag and on the handles pulling them just enough. If cruising at highway speeds I have to push on the clutch and brake levers to keep the cruise control system from being disabled by the lock out switches. Like in a car, when you engage cruise, if you press your brakes, cruise control turns off. If you have any thing on your handles that might cause drag and pull on the handles at highway speeds enough to trip the switches, that might be the issue.

Where are we going, and what's with this basket?

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