Technical Cruise control retrofit

[nigelvan]

Like many, I would like to retrofit a cruise control in my van. It's a 2007 Jumper/Relay from Citroen but it has the 3.0 Iveco so the ECU is identical to its Italian twin afaik.
I was a bit shocked as I saw the pricing of some aftermarket products, but after digging into elearn it seems that fitting a cruise control is only a matter of getting 4 wires to the ECU.

If I understood correctly I just have to
- install a switch providing 12V (from pin 2 connector B fuse F51) to pin 77 on the ECU to enable cruise control
- install 3 push button switches to 38 for resume, pin 78 to decrease speed and pin 56 to increase speed.

I could get a stalk from the scrapyard or from a compatible model (Croma?) or just build my own.

Is it really that simple (well, apart from getting all the wiring in and to the ECU) and where can I get the right pins for the ECU connector?

 

[the green vanper]

Hello,

Yes, the cruise control retrofit is really simple. The croma lever has different locking system, but can be managed by cutting an additional piece of plastic off. It's easier to fit the one from Ducato. There are a couple of Ducato levers available, depending on the BCM you have. As far as I remember, 2, 3 or 4 / 5 pins.

I'll try to add more info to that thread, as I have collected some information before while planning to do the mod on my Natural Power version (which is a little bit complicated).

 

[Communicator]

Like many, I would like to retrofit a cruise control in my van. It's a 2007 Jumper/Relay from Citroen but it has the 3.0 Iveco so the ECU is identical to its Italian twin afaik.
I was a bit shocked as I saw the pricing of some aftermarket products, but after digging into elearn it seems that fitting a cruise control is only a matter of getting 4 wires to the ECU.
View attachment 452590
If I understood correctly I just have to
- install a switch providing 12V (from pin 2 connector B fuse F51) to pin 77 on the ECU to enable cruise control
- install 3 push button switches to 38 for resume, pin 78 to decrease speed and pin 56 to increase speed.

I could get a stalk from the scrapyard or from a compatible model (Croma?) or just build my own.

Is it really that simple (well, apart from getting all the wiring in and to the ECU) and where can I get the right pins for the ECU connector?

Several members, myself included have made similar modifications to the x244 model, which also uses a Bosch ECU. I think that in all instances, the necessary ECU connections were available at a connector behind the dash. Perhaps not so convenient on the x250?
Generally on the x244 the brake pedal switch had to be changed for a normally open, plus normally closed version. Not an easy task, although the pedal switch wiring was already present
On the x244, an Alfa 147 cruise squib was the preferred switch assembly. I find it more tactile tham the OEM switches fitted to our Saab and Skoda cars.

The following thread may be interesting, although perhaps not fully applicable to your x250. https://www.fiatforum.com/threads/x244-cruise-control-retrofit-2-8jtd-2005-factory-parts.473036/

As regards compatible pins for the Bosch ECU, if not already done, it could be worth checking that the relevant pins are not already wired out?

 

[nigelvan]

Several members, myself included have made similar modifications to the x244 model, which also uses a Bosch ECU. I think that in all instances, the necessary ECU connections were available at a connector behind the dash. Perhaps not so convenient on the x250?
Generally on the x244 the brake pedal switch had to be changed for a normally open, plus normally closed version. Not an easy task, although the pedal switch wiring was already present
On the x244, an Alfa 147 cruise squib was the preferred switch assembly. I find it more tactile tham the OEM switches fitted to our Saab and Skoda cars.

The following thread may be interesting, although perhaps not fully applicable to your x250. https://www.fiatforum.com/threads/x244-cruise-control-retrofit-2-8jtd-2005-factory-parts.473036/

As regards compatible pins for the Bosch ECU, if not already done, it could be worth checking that the relevant pins are not already wired out?

Thanks for the feedback! Yes it's a good idea to check if those pins are indeed still free. I've fixed an issue with the wiring harness and the high speed fan so I know my way around the ECU connectors. According to this dutch post you should get the wiring to the ECU yourself. I don't think you need to involve the brake pedal here as the ECU will already know when you press it, well, at least this is what I get from reading the functional description in the online elearn. Btw, error in my previous post, I'll need pin 13 on connector A of B002 to get 12V through fuse 51. But I know my way around that one too from my D+ adventures, if you remember that..

The "Cruise Control function" is managed by engine management control unit M010 by the left steering wheel stalk control H005 (connector B).

The steering column stalk control receives an (INT) ignition-controlled power supply - pin 2 of connector B - protected by fuse F51 of the junction unit under the dashboard B002.

The steering column switch unit H005 is connected to control unit M010:

• from pin 1 of connector B to pin 38 of connector B, with the RESUME signal;
• from pin 4 of connector B to pin 77 of connector B, with the ON/OFF signal;
• from pin 5 of connector B to pin 78 of connector B, with the SET - signal;
• from pin 6 of connector B to pin 56 of connector B, with the SET + signal.

The engine management control unit receives the speedometer signal, through the CAN (pins 83 and 84 of connector B), coming from the ABS/ESP control unit M051 and the other signals useful for the function internal management logics.

The engine management control unit M010 is connected, through the CAN line, to the Body Computer and the instrument panel E050 to manage the "Cruise Control on" warning light.

 

[the green vanper]

Hello,

That's the x250 EUR5 cruise control wiring diagram (2 pin lever):

That's the x250 EUR4 cruise control wiring diagram (5 pin lever):

The elements description:

B002 junction unit under dashboard
B099 maxi fuse box on battery
C022 centre dashboard earth
E050 instrument panel
H001 ignition switch
H005 steering column switch unit
M001 body computer
M010 engine management control unit

As far from I've found on the internet (other forums, youtube, etc.) a part of the x250 has the wiring ready, so there are only two things to do: buy and install the lever and activate the cruise control function in MES. In some of the cases, activation via grounding one of the terminals is possible, can't find the details at the moment. If not, this part of the wiring has to be done. I've read people were reusing the pins from the looms leading to the ECU.

The original wiring is 0,35 mm2.

This is how the lever plug looks like. I had somewhere the producer part number, can't find it right now.

 

[nigelvan]

Thank you so much for digging in. I have the euro 4 version.
I have to activate the function through MES? Used MES a couple of times in the past but never saw the option...

 

[the green vanper]

The problem is the option is not available on the Ducato model. I can't remember which model menu I used to activate it on my van, but it has been activated. As far as I remember, it was one of the Pandas.

I was trying to find it now and I did In the Panda 2020 1.0 GSE Hybrid / Body / CAN Setup Proxi Alignment Procedure (2014+) / Adjustments.

But I'm 99% sure it was not the one I've used before. After activating it you need to do the proxy alignment. But for this one, I'd use the appropriate Ducato menu in order to have all the modules. I had a problem with this on my van.

And before you make any changes to the configuration, make a backup of the original proxy of the van just in case. There's the procedure:

MultiECUScan - Backup Proxi file on MES

This thread is for the general discussion of the Guide Backup Proxi file on MES. Please add to the discussion here. theoneandonly submitted a new guide: Backup Proxi file on MES To save a copy of your proxi file (before you start changing things that need a proxi alignment) These example...

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