citroen c4 grand picasso

[Steve_1976]

hi people ... i have a strange problem with my cruise control/ limiter I own a 2007 citroen c4 grand picasso top range electric everything and well the limiter stopped working stuck on 18mph now can't change it at all if I push the decrease button the p symbol lights up goes off and on . The cruise the + don't work to set cruise i have to use the set - button the set - don't do anything with the limiter thought might be switch but the -button works on cruise control The + don't . There is no faults on ecu tried enable and disabling via lexia diagnostics still the same any one no whats it could be the module maybe any ideas where this could be .
Kind regards steve

[GiveMeABreak]

Steve, please post up your VIN (automatically masked on submission) so I can see the exact model you have.

Also, when you say 'P' is flashing - is this an illuminated warning lamp as in a P inside a yellow triangle, or P inside a red Circle, or a P inside a yellow circle - or none of the above - and if so where is the P flashing up and on what display?

If you are getting non-activation or random deactivation of the cruise and / or speed limiter functions, with a warning lamp, then this is likely to require a replacement intermediate brake switch harness and brake switch. Originals were known to cause problems, so the manufacturing process was changed later - as you have an early model, it's quite possible this may be the cause.

[Steve_1976]

Hi Marc the P is lit green its the p for the park distance there is no red or yellow at all around the P . Normally I would push the P button on the steering wheel for park distance by 2 parked cars to enable it but if I push the -button on the cruise contol is lights up green instead of the P button. Its like there's a short but I don't think so some how . ill post vin for you tomorrow marc if thats OK love to sort this fault out the ECU can not find any fault with the cruise control/limiter the break switch sounds interesting tho I'm guessing its connected to the pedal arm . I thought maybe a problem with the cruise control module but yes very puzzling the cruise does work to set it i have to press down - button . + does not work at all so to set the speed i want i have to... example set at 70mph press down - done + dont work bug limiter stuck at 18mph - button does nothing or + nothing on limiter ... thanks again steve

[GiveMeABreak]

Ok, so that's your parking space gap measurement.

At this point it will really need Lexia on it - because the parking gap measurement button should have nothing to do with the cruise or speed limiter - the only thing they have in common is the proximity to the steering wheel switches for the cruise and speed limiter....

Given that your '+' is not functioning, only the '-' and the fact that when you do use the '-' switch it is directly opposite the <P> , it it also trying to activate the parking gap measurement and that is then throwing a wobbly because the conditions are not met for that operation (indicator not on, speed too high etc.), so the 'P' is just telling you the parking gap measurement is not measuring.

So because of that last bit of info regarding the 'P', I am more likely to be leaning towards the steering wheel controls as being worn out / dirty / broken as pressing the minus is also trying to activate Parking Gap Measurement.

Lexia may show you the same info if you undertake some actuation switch tests - it should show you if and what each button press is registering - or not. So be prepared to replace the module at this stage.

With these models, you have the Steering wheel switch module and on the steering wheel itself, the VMF module - which is the one that houses all the buttons.

[Steve_1976]

Hi marc ... the steering switch i haven't pulled this off yet do you no if and how this comes off. Does the air bag meed to cone away to get to the switch, the module is the switch ? or the moduel is inside the steering wheel ? nothing ever straight forward on citroen the + dont work at all the - button only works on cruise not limiter strange as if - works on cruise why not work on lim just don't get it but still no faults have been recorded in the ecu as a fault ill send my vin later this morning just got to work . Thanks again for your info , Steve

[Steve_1976]

Marc my vin is this : VF7**************[VIN obfuscated, can be read by forum staff] THANKS STEVE

[GiveMeABreak]

Ok, so you have like a 'collar' at the rear which houses the indicator and lighting stalks. this is the switch module.
Next you have seated on the steering wheel the VMF module with the cruise switches etc.
Then you have the Airbag boss that goes in the middle.

The Switch Module is shown below

I suspect the VMF part is plugged into the rear Switch module through some connectors. Beware though, as removing the fixed steering wheel controls requires a special tool to lock the steering wheel before removing the module.

Now I can't say which part is faulty, but I can only assume that the buttons are probably the primary suspect on the VMF module as it is these that are sending none, partial or mixed signals.

[Steve_1976]

Hi marc , you mean the buttons that control the cruise /lim needs special tool to remove them or the control module it self ? I was hoping a simple fix but noing this dont normally happen specially for me ok I going to remove the switches strip down & clean out then progress some how to the control mod but this probably need replacing . Ill keep you posted and again thank you a big help kind regards steve

[GiveMeABreak]

No not the Steering Control module with the lighting and wash stalks Steve. I'm talking here about the Fixed Steering Wheel Controls (VMF unit) that needs a special tool. This is the guide so may explain it. Note that this does not cover removing the separate Steering Wheel Control Module.

Tooling

[1] tool for locking the fixed centred controls steering wheel 9702-T.

Perform the following operations:

• Take out the ignition key
• Wait for at least 3 minutes
• Disconnect the battery following the BSI Reset / Battery Disconnect / Reconnect Procedure

Removing the driver’s air bag.

Wait at least 2 minutes after disconnecting the battery before removing the Airbag

Insert a large flat screwdriver in the orifice " a". Push on the pin (2) by means of a screwdriver. Unclip the airbag (1). Disconnect the airbag (1). Remove the airbag (1). Be cautious when storing an operational airbag! Refitting N.B.: Observe the precautions to be taken. Reconnect the airbag. Clip the airbag (1) on the steering wheel.

Continued: Removing Fixed Steering Wheel Controls

Removing

Remove the bottom left hand panel ( 1). Uncouple the upper ( 2) and lower (3) steering column cowlings. Remove: The lower steering column cowling ( 3) The driver’s air bag	Disconnect the connector (at "a").
Disconnect the connector (at "b").	Remove bolts (4). CAUTION: Do not expose the fixed centred controls steering wheel to impacts.
CAUTION: Fit the tool [ 1] before removing the fixed centred controls steering wheel. Clip the tool [1] on the fixed centred controls steering wheel (at "c").	Remove: The nuts (5) The steering wheel with fixed central controls

Refitting

Refit:

• The steering wheel with fixed central controls
• The nuts (5)

Tighten the nuts (5) to 0,7 ± 0,1 daN.m.
Remove the tool [1].
Coat the bolt (4) with threadlock LOCTITE.

Refit:

• The (4) bolt ; Tighten to 3,3 ± 0,3 daN.m
• The driver’s air bag (see the relevant operation)

Connect the connectors " a" and "b".
Refit the lower steering column cowling ( 3).
Recouple the upper ( 2) and lower (3) steering column cowlings.
Refit the bottom left hand panel (1).

Reconnect the battery following the reconnection part of the BSI Reset / Battery Disconnect / Reconnect Procedure
Check that the electrical equipment operates correctly.

[Steve_1976]

Oh my marc now this looks complex , ok ill look at it weekend ill pass on the feed back on here if other people have same or similar issues thanks again steve