Temperamental cruise control

[Patrick Bateman]

Recently got my cruise control working after years of it not functioning due to dodgy rear light wiring causing the fog lamp symbol to flicker on the dash when braking/indicating.

However, now noticing it playing up in the past week or two. The garage found it a bit dodgy when they sorted the wiring and recommended a kit that includes new steering wheel buttons etc. but I had found it fine 99% of the time until recently.

Based on this week, every single morning when it's cool outside (5.15am) it works on my commute without issue. Every single evening when driving home it doesn't work at all.

The only difference I can see here is that we've had warm weather here recently and the car sits in a sunny car park all day. Sounds very odd but I don't see what else would be contributing to this difference.

Any ideas?

 

[Patrick Bateman]

Same again today, that's 4 days in a row it's been identical.

 

[STEVE.M]

Same again today, that's 4 days in a row it's been identical.

Any defect in the connections to ECU pins 23/48/49/52/53/58/77 could cause this.

https://www.cliosport.net/threads/clio-182-upgraded-cps-loom-wiring-diagrams-ecu-pinout.790043/

 

[Patrick Bateman]

You think the temperature could affect it?

 

[STEVE.M]

You think the temperature could affect it?

Yes.

https://www.quora.com/Why-does-elec...rature-while-that-of-semi-conductor-increases

 

[Patrick Bateman]

Cheers.

Now for the next question, where do I get a physical look at these?

 

[Louis]

You changed your brake pedal switch? I was having similar problems and a genuine one from ECP cured it.

 

[Patrick Bateman]

No although would that not tend to just stop it working altogether?

 

[Louis]

No although would that not tend to just stop it working altogether?

Nope, mine was intermittent.

 

[Louis]

For the price of £7 or so get it changed. Don't get one from ebay as there's loads of fakes. Just go through ECP.

 

[Joe#]

Check the connections on your rear lights and give them a clean.

 

[STEVE.M]

Cheers.

Now for the next question, where do I get a physical look at these?

Here, but you have to trace them back through the engine bay loom.
I had a brake light switch fault code for another problem, but replacement made no difference.
https://www.google.co.uk/search?q=9...h=985#imgrc=EPuwcORvwxqG_M:&spf=1526590250003

 

[Patrick Bateman]

Sorry, where exactly? That's a photo of a random 90 pin connector, unless I'm missing something.

 

[STEVE.M]

Sorry, where exactly? That's a photo of a random 90 pin connector, unless I'm missing something.

ECU= =BRAIN.

probably best if you carry on without a cruise control,

 

[Patrick Bateman]

Having just recently got it working on the car after 3+ years of not having it I'd rather have it to use, makes commuting and longer journeys much less tiring.

 

[Tony Lampe]

I just adjusted my brake light switch with the aim of fixing a long standing issue with the ABS and SERVICE dashboard lights coming on. By pushing the brake light switch plunger/piston in one click further that it normally would be with the auto adjustment - which occurs when the brake pedal is released - the switch is now more sensitive, i.e. it operates with less travel of the brake pedal. And that seems to have fixed the ABS and SERV dash light problem, but now I've got the rear fog light dash light coming on when braking with the left indicator on!