740 B230E Cruise Control

[swedish brick]

Originally Posted by panda529e699

Would certainly like to buy the redundant bits from you, whilst not complete it would give me a start.
Will also look on the 240 page Dave suggested and the 760 option for the rest.
Thanks
Andrew

They’re not much use to me as I don’t intend to bother fixing it on mine!

Do you want me to try and strip it out?
The main bits would be the actuator and bracket, and the little cable.


I’ve taken the cowling off from around the steering column today, just to see what’s going on with the switch wires.
There’s a big multiplug which is plugged in, which I’m assuming without looking in the manual, is for the indicators and hazards. There looks to be another smaller bunch of wires that come out of the bottom of the switch too and disappear down behind the dash...
Tugging them, they do seem to be plugged in, but without removing the lower dash I can’t see much.

[panda529e699]

Originally Posted by swedish brick

They’re not much use to me as I don’t intend to bother fixing it on mine!

Do you want me to try and strip it out?
The main bits would be the actuator and bracket, and the little cable.


I’ve taken the cowling off from around the steering column today, just to see what’s going on with the switch wires.
There’s a big multiplug which is plugged in, which I’m assuming without looking in the manual, is for the indicators and hazards. There looks to be another smaller bunch of wires that come out of the bottom of the switch too and disappear down behind the dash...
Tugging them, they do seem to be plugged in, but without removing the lower dash I can’t see much.

If you could give it a go at some point please, think they would be useful. Thanks

[swedish brick]

Originally Posted by panda529e699

If you could give it a go at some point please, think they would be useful. Thanks

I’ll have a go then, over the next few days, see how much I can get off. I’m 99% sure the actuator and bracket won’t be much of a problem. It’s the electrical bits, if any at the switch end. Plus, I’d need to find a replacement indicator switch without the cruise button so I can keep using the car!

[Laird Scooby]

Originally Posted by swedish brick

I’d need to find a replacement indicator switch without the cruise button so I can keep using the car!

Two suggestions - first is if one of you can do without the car for a couple of days, remove and post their indicator switch to the other. The other then swaps the switches over and returns the one removed from their car.

Second is :

https://www.ebay.co.uk/itm/Volvo-740...5/174064013650

If one of you buys that and it finds its way down south, is swapped and then the cruise button equipped one then finds its way north and you can sort the finances however you like.

I would offer my old one but it's not got the hazard switch built in, that's separate on mine and also contains the flasher relay, all in one rocker switch on the dashboard!

[swedish brick]

Originally Posted by Laird Scooby

Two suggestions - first is if one of you can do without the car for a couple of days, remove and post their indicator switch to the other. The other then swaps the switches over and returns the one removed from their car.

Second is :

https://www.ebay.co.uk/itm/Volvo-740...5/174064013650

If one of you buys that and it finds its way down south, is swapped and then the cruise button equipped one then finds its way north and you can sort the finances however you like.

I would offer my old one but it's not got the hazard switch built in, that's separate on mine and also contains the flasher relay, all in one rocker switch on the dashboard!

Sweet! Ta for that link, I’ve just ordered one from them so that sorts that out! Once it arrives I’ll swap it over. In the meantime I’ll look at removing the other bits and see where that wire goes behind the dash & see what, if anything, is attached to it. You never know, it might have the loom etc with it too!!

[swedish brick]

Right then...

I’ve had another proper look at my car.
What I had expected was to find the switch with no cruise wiring connected to it, and of course the vacuum actuator and it’s control cable attached to the throttle.

Now, today what I’ve actually found is that the switch is in fact connected to a second wiring harness! One spur seems to go up to the dash binnacle, another bigger bunch of wires go to a control unit (I haven’t actually seen this, but the manual says that’s what it goes into), there’s also a sensor attached to the back of the brake pedal with wires into it and a vacuum hose. Then more wires disappear through the bulkhead with the vacuum hose.
On the engine bay side, you can then trace the wiring and vacuum hose along the top of the bulkhead, where the vacuum hose goes into a T connector, one piece goes from that into the back of the vacuum actuator, the other carry’s on with the wiring along the bulkhead to the passenger side inner wing, then dips down and runs along the chassis leg and then into a black control unit.
Looking in the manual says this is the vacuum pump.

It would appear then that my car has actually got a complete or very nearly complete cruise control system in it! The only thing I’ve not actually seen is the control unit inside the cabin. The wires are all there and feel tight when tugged, so I think they are plugged into something.
Weird thing is, given the amateurish way some of the other things on this car were done when I got it (that I’ve had to go around fixing!) this isn’t like that. It looks like all the proper parts and it’s completely clipped into the cars loom and done very neatly. Which will make it a pig to get out again.
It’s either been fitted at the factory/dealer or done by someone who knew what they were doing.

I’ve run out of time for now, but I’ll have another look for the control unit in the cabin. And I might get the car out and actually try using the cruise and see what, if anything happens. There should be a power supply from the switch as that is working, so at the very least something might start making noises, catching fire etc etc...

Bear with me on this!