Severe shaking problem towing behind motorhome - Page 57 - 2014+ Jeep Cherokee Forums
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post #561 of 566 (permalink) Old 02-25-2017, 02:09 PM
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Quote:
Originally Posted by Monk View Post
My Cherokee has been a PIA but now seems to be OK with the kit. I added a relay in place of the toggle switch as discussed on this forum. It seemed like a great idea. Here is my experience and one last question for the forum. Sorry this is rather long but may help others with their Cherokee.

In North Carolina (my relay was still used in place of the toggle switch), the parking brake came as I hooked up on so I disconnected everything and started the process all over. Then the engine would not start and the dash display said "power steering service required" and various other strange things happened. A rollback took it to a dealer since it would not start. After staying unplanned for an extra week, the dealer said it suddenly started OK. They cleared a lot of error messages and it worked OK.

I believe my addition of a relay in place of the toggle switch caused part of the problem. It was triggered on at the same time as the under hood relay was energized. I believe both relays engaging at the exact same time created confusion on the network buss. I went back to the factory toggle switch and so far no problem except for the following observation:

Steering stays activated:
I noticed that the steering stays active for 17 minutes after the toggle switch is turned off and the relay under the hood is de-energized. I have seen others comment about this. I have avoided any ignition sequence to get it back to driving mode until the steering goes inactive. So far this has worked OK but the Jeep is often setting in the roadway for 20 minutes before I dare try to move it. I do not want to risk another incident as I believe starting the vehicle while the steering is still powered up may have been the cause of my issue in North Carolina.

I would appreciate others sharing their experience regarding the steering remaining active.
I too considered using relays but decided to follow the KISS principle. The only thing I did was include a switch in series with the harness fuse to eliminate pulling and reinserting that fuse. As you have observed, everything works fine every time.

I agree the relay may cause a timing issue with disconnecting the CAN bus connection at the same time the (EPS) electric power steering system is activated. Maybe a timer delay circuit would help. Regardless, the operating instructions are clear about waiting for the bus to sleep, flipping the switch in the center console box (CAN bus disconnect switch) and then activating the EPS.

The steering staying active is not a problem. For me it is actually helpful at times. I use a Blue Ox tow bar and when disconnecting it may bind up the pins if I have not got the KL lined up perfectly straight behind the MH. With that tow bar, if the wheels are turned away from the side of the bound-up pin, it unbinds it. So the EPS remaining on becomes an advantage in that situation.

The first two steps for shifting out of Neutral Mode is to deactivate the EPS and then flip the toggle down to reconnect the CAN bus connection. As long as those two steps are completed, you are good to go, regardless how long the EPS remains activated. I've never had a problem with it.

2015 White/Black Limited | 3.2-L V6 | Active Drive II | Tech Grp | Lux Grp | Trailer Tow Grp | SafetyTec | Uconect 8.4AN | 9 Speakers | Tonneau Cover | Born 09-06-14 : (( (( (( (( (( (( (( :
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post #562 of 566 (permalink) Old 02-25-2017, 04:50 PM
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Ensuring EPS is disconnected from CAN bus before energizing it

As mentioned above a separation of steps (via separate manual steps or some type of automatic delay) is needed to make sure the EPS is disengaged before power is applied.

My existing setup has power coming from the MH and a switch hidden in the cubby box left of the steering wheel to power on my auxiliary brake. It is the last thing I touch in setting up to tow. I intend to add to this switch the function to engage the EPS power relay. This will make the EPS setup automatic entirely through relays but still ensure the correct sequence.
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post #563 of 566 (permalink) Old 02-25-2017, 05:16 PM
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Thanks Array. If it has worked for you then I will try it. After all my problems I just don't want to be calling another rollback to tow it away again!
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post #564 of 566 (permalink) Old 02-26-2017, 10:24 AM
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I recall noticing the EPS stays active a bit after switching out of tow mode; never timed it. Within a few minutes we usually have the Jeep disconnected and moved out of the way.

... RP
2015 Trailhawk
CherryRed&Black, V6, Uconn8.4-Navigation
Comfort/Convenience, ColdWeather, TrailerTow pkgs
Ordered 8/6
Status D1: 8/13, F: 8/26, I: 8/27, KZ: 9/2, KZM: 9/3
Arrived at Dealer 9/10, 42 days from order date.
Took Delivery Sept. 12, 2014.
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post #565 of 566 (permalink) Old 03-10-2017, 02:30 PM
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thanks array

thanks array,
I just got my harness installed yesterday on my 2015 TrailHawk and noticed the steering stayed active and wasn't sure if that was normal. I did notice that after starting to verify normal operation, that as soon as I turn off the engine the steering was off also. (hard to turn steering wheel)

Did not have any problem when turning key on as soon as switch off and fuse pulled.

thanks -- wayne

Quote:
Originally Posted by Array View Post
The steering staying active is not a problem. For me it is actually helpful at times. I use a Blue Ox tow bar and when disconnecting it may bind up the pins if I have not got the KL lined up perfectly straight behind the MH. With that tow bar, if the wheels are turned away from the side of the bound-up pin, it unbinds it. So the EPS remaining on becomes an advantage in that situation.

The first two steps for shifting out of Neutral Mode is to deactivate the EPS and then flip the toggle down to reconnect the CAN bus connection. As long as those two steps are completed, you are good to go, regardless how long the EPS remains activated. I've never had a problem with it.
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post #566 of 566 (permalink) Old 03-10-2017, 05:17 PM
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Originally Posted by waynerth@gmail.com View Post
thanks array,
I just got my harness installed yesterday on my 2015 TrailHawk and noticed the steering stayed active and wasn't sure if that was normal. I did notice that after starting to verify normal operation, that as soon as I turn off the engine the steering was off also. (hard to turn steering wheel)

Did not have any problem when turning key on as soon as switch off and fuse pulled.

thanks -- wayne
Glad to hear you're set up. Welcome to the forum.

Assume you are heading out I-10 on your trip? Last time we went west from FL headed to New Orleans, we stopped at Topsail Hill Preserve State Park RV Resort in Destin, FL and then cruised the shore to Gulf State Park in Gulf Shores, AL. Both Spectacular state parks.

Hope you have a great trip. Let s know how it goes and what you think about towing your TH.
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2015 White/Black Limited | 3.2-L V6 | Active Drive II | Tech Grp | Lux Grp | Trailer Tow Grp | SafetyTec | Uconect 8.4AN | 9 Speakers | Tonneau Cover | Born 09-06-14 : (( (( (( (( (( (( (( :
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