Wiring diagram - advice please (photos)

[SD1too]

Thank you for your very clear answers Dougie.

Originally Posted by goltho

I'm wondering though if the set/accelerate switch on the wheel needs to be pressed before voltage is present?

Yes, RAVE confirms this.

Originally Posted by goltho

Having said that, the IPK light here still doesn't come on under any circumstances.

RAVE also says that the vehicle must be moving under engine power before the cruise control will engage. Could that be the problem; that you're testing it just by turning on the ignition?

Simon

[goltho]

Originally Posted by SD1too

RAVE also says that the vehicle must be moving under engine power before the cruise control will engage. Could that be the problem; that you're testing it just by turning on the ignition?

I wish. I always take it down the lane to >22mph before checking.

Am I correct then in believing that C0239-11 outputs +12v to the EAT, IPK light and the vacuum pump? I'll check it again in the morning as it's raining now.

Thanks again,

Dougie.

[marinabrian]

Originally Posted by SD1too

Thank you for your very clear answers Dougie.


Yes, RAVE confirms this.

RAVE also says that the vehicle must be moving under engine power before the cruise control will engage. Could that be the problem; that you're testing it just by turning on the ignition?

Simon

If you were looking at this screen with the car travelling at a speed of >25MPH and then the set accelerate button was pressed, the "cruise inactive" would toggle to cruise active and the cruise symbol would illuminate on the IPK

The cruise ECU will not allow cruise to be enabled before a minimum speed threshold is passed.

Brian

[goltho]

Originally Posted by marinabrian

https://www.the75andztclub.co.uk/forum/attachment.php?attachmentid=83183&stc=1&d=15933811 77

If you were looking at this screen with the car travelling at a speed of >25MPH and then the set accelerate button was pressed, the "cruise inactive" would toggle to cruise active and the cruise symbol would illuminate on the IPK

The cruise ECU will not allow cruise to be enabled before a minimum speed threshold is passed.

But if the state is being reported as Switch 1 Brakes Off/Test Switch Brakes On, wouldn't the IPK cruise symbol remain off? And the same the other way around - Switch 1 Brakes On/Test Switch Brakes Off which is what mine was showing on Jamie's T4? Either of the "brakes on" state would surely cause the IPK light never to illuminate, because braking suspends cruise?

Dougie

[SD1too]

Originally Posted by goltho

Am I correct then in believing that C0239-11 outputs +12v to the EAT, IPK light and the vacuum pump?

Yes.

Simon

[marinabrian]

Get the new switch fitted and take it out for a drive Dougie, then see what happens

Brian

[goltho]

Originally Posted by marinabrian

Get the new switch fitted and take it out for a drive Dougie, then see what happens

Brian

Doing exactly that this afternoon Brian. I agree it all points to that.

(Just cos I'm paranoid doesn't mean it's not all a conspiracy though.....)

Dougie.

[goltho]

Got the brake switch fitted (I did it myself in the end). Cruise still does not function. I've lost the will to live with it tonight so tomorrow I'll run the same checks and see it anything's different. The way I'm feeling tonight, I may disconnect it all and start enjoying the car.

We''ll see what tomorrow brings.

Dougie.

[SD1too]

Originally Posted by goltho

Got the brake switch fitted ... Cruise still does not function.

Hi Dougie,

In post no. 6 you said you intended to buy XKB 000 022A. Did you do so? This switch is described in MarinaBrian's EPC screenshot as:
"Manual, petrol, except cruise control".
Your car is automatic, petrol, cruise control.

I would have thought that XKB 000 090 is a better bet.
The EPC is ambiguous to say the least.

Simon

[goltho]

Originally Posted by SD1too

In post no. 6 you said you intended to buy XKB 000 022A. Did you do so?

Yep, I did despite initially thinking that XKB000090 should be the one. This was because I read two posts where the switches were replaced by XKB000022As. These were KV6s having cruise retrofitted - but they both were pre-wired. That was enough to introduce some doubt to my mind but I went ahead with the 22A anyway. I should have gone with the only switch specified as double pole.

Originally Posted by SD1too

This switch is described in MarinaBrian's EPC screenshot as:
"Manual, petrol, except cruise control".
Your car is automatic, petrol, cruise control.

I would have thought that XKB 000 090 is a better bet.
The EPC is ambiguous to say the least.

You're not wrong. Brian's screenshot could even contradict itself by also saying "Manual, Cruise Control".

I may try the XKB000090 tomorrow if that's what it'll take to prove the brake switch's guilt. If that doesn't do it, I'll re-check every damn connection and probably get the snips out if they're not at fault.

Dougie.