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  #325  
Old 09-23-2013, 05:14 PM
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Okay, now I remember. The trigger wire that comes from the COLD side of the brake switch (red wire) will be energised by the brake controller when the override lever is used. This is effectively the same as closing the brake pedal switch when you put your foot on the pedal. Depending on the design of the brake switch (single or double pole, + or - switched) this will determine whether using the override will disconnect the cruise control or not. Will check my Prado today, as Pricks Cars still has my GC. (Takes a lot to comply these Aussie-bound cars)

As a side thought, I was just wondering whether Jeeps are (-) switched at the brake pedal? This would explain why some auto elecs are tapping elsewhere in the loom and causing problems.
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  #326  
Old 09-23-2013, 05:46 PM
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Re: The Towing thread

The problem has nothing to do with the way they have wired the brake controller.
It is the fact that they have not used the correct Jeep loom for the MY14 and the CAN BUS system for the rear lights.
I think that on the MY14 all the rear light are controlled by the can bus individually and are not linked together like the MY12/13 and that is the reason I only have the LHS brake light coming on when I use the brake controller.
I have heard the MY14 loom has a control box built in to it to work with the CAn BUS.
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  #327  
Old 09-23-2013, 05:58 PM
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Re: The Towing thread

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Originally Posted by Willx View Post
I do know that only the North American Builds come with the Connector you speak of under the dash for this purpose.
Actually, that's not the connector that I was referring to as I know that AU models do not have it.

I was referring to the connector pictured on allypally's post on 09-06-2013.

I had assumed that a similar connector (though obviously different in some way) existed on the MY14. Though it appears as I theorised yesterday and xdra10 appears to be confirming, the proper MY14 loom has a CAN ECU.
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  #328  
Old 09-23-2013, 05:59 PM
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Re: The Towing thread

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Originally Posted by xdra10 View Post
I have heard the MY14 loom has a control box built in to it to work with the CAn BUS.
If you don't mind me asking, where did this information come from?
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  #329  
Old 09-23-2013, 06:29 PM
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Re: The Towing thread

I am picking up my new Y14 GC Limited this afternoon with a P3 fitted by the dealer in the dash cubby hole. I will check what my lights do and report back later.

Doug
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  #330  
Old 09-23-2013, 07:24 PM
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Re: The Towing thread

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If you don't mind me asking, where did this information come from?
When I picked up my Jeep from the dealer a month ago they told me that the Tow bar loom was not in stock and that was the reason I had to wait for the tow bar to be fitted.
He told me it was a special loom that had a ECU in it to control the lights.

When they fitted the tow bar 2 weeks ago I assumed that would have fitted the correct loom but when I had the brake light issues I pulled the car apart and could not find no ECU in the loom and noticed it was spliced in to the wiring.
I rang and spoke to the service department and they told me that Jeep Australia had come up with a way to modify the MY13 loom and that is what they have fitted.
He then told me that the correct MY14 looms have arrived and that has a control box in it and that what they will be fitting to my Jeep on Wednesday

This is all from the dealer/service guys mouth and I have not see it with my own eyes so it could all be bull***t.

I will let you know more tomorrow night when I have see it all working correctly.

Cheers Brad.
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Old 09-23-2013, 07:32 PM
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Ok Thanks. I wonder what I have then.
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  #332  
Old 09-23-2013, 07:38 PM
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Re: The Towing thread

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Ok Thanks. I wonder what I have then.
I think if you don't have a brake controller you will never know you have a modified loom and I don't think it will cause any problems.
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  #333  
Old 09-23-2013, 07:46 PM
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Re: The Towing thread

Well, fitting my P3 is the first on my list... When SWMBO lets me have the time
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Old 09-23-2013, 08:58 PM
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Re: The Towing thread

With respect Brad, it has everything to do with how they've wired your controller. It all depends where they've put the red wire. As I think I mentioned in a previous post - it has probably been tapped in downstream of the brake light ECU (if it has one). I suspect there are three isolated lamp outputs (for bulb failure motoring purposes) and your electrician has tapped into the left hand brake lamp circuit.

It would make sense that the MY14 towing loom would have some system to integrate all 3 lamps coming on simultaneously by adding the input for the brake lights (red wire from the controller) UPSTREAM of the brake light ECU.

Hope this makes sense.
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Old 09-23-2013, 09:47 PM
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Re: The Towing thread

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Originally Posted by Jarse View Post
With respect Brad, it has everything to do with how they've wired your controller. It all depends where they've put the red wire. As I think I mentioned in a previous post - it has probably been tapped in downstream of the brake light ECU (if it has one). I suspect there are three isolated lamp outputs (for bulb failure motoring purposes) and your electrician has tapped into the left hand brake lamp circuit.

It would make sense that the MY14 towing loom would have some system to integrate all 3 lamps coming on simultaneously by adding the input for the brake lights (red wire from the controller) UPSTREAM of the brake light ECU.

Hope this makes sense.
This only make sense if such a signal actually exists upstream. As I understand it, upstream from the ECU is a CAN bus. Somewhere else on the CAN bus, some ECU is putting the brake signal onto the CAN bus. That ECU would presumably be connected to a sensor on the brake pedal, that would be the only upsream location. The question is, is this sensor compatible with the P3? i.e. is it a simple switch with the hot side connected to 12v+ that closes when the brake is pressed. Can it be interrupted when the P3 back-feeds the brake signal?
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Old 09-23-2013, 10:53 PM
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Smile Re: The Towing thread

That's feasible, Coreys. And that is the question, which is probably why the MY14 has a different tow wiring harness to the MY13.

In the absence of any other info, I reckon the MY14 harness has its own "turn brake lights on" signal through the CAN.

All this is speculation until someone gets a look at the wiring diagram.......
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