W124 cruise control not working

[Ade B]

Anyone..?

Ade

 

[c955]

'Fraid I can't help...but I am watching this thread since my CC doesn't work at all, though it used to a year or so ago...

 

[andy_k]

I think the location depends on the model - under the bonnet, on the passenger side, you have a box of control units/ECUs. I think the rearmost one is the cruise control. I also think that on some models, it's located behind the kick panel in the passenger footwell

 

[Ade B]

Thanks Andy, I'll hopefully have a look this weekend.

Racking up the motorway miles at the moment so it would be good to get it fixed..

Ade

 

[Ade B]

Today tried the cruise again and it worked for most of the outward journey.. Coming back it would engage and then disengage sometimes instantly other times after a couple of seconds..

Searching the interweb it appears it could be one of a number of issues:

1. Vacuum pipe leaks
2. Throttle actuator on its way out
3. Dry joints in the Amp (which I have still to locate - a pic would be super)
4. Something amiss with the brake circuit (the brake light triggers the cruise to disengage)
5. Iffy speedo cable (which I have at low speeds)

Wheels & tyres are stock and in good order.

Any ideas as to which sequence the above should be tackled..

TIA

Ade







l

 

[Dieselman]

Possible OVP dry joints as well.

Isn't the CC amp under the dash.?

 

[Ade B]

The OVP was brand new earlier this year.. The CC has intermittently surged since I've had the car, but has only recently gone on the blink.

I read that the 123 CC Amp is under the dash, don't know if 124s are the same - its a fairly generic area Any ideas as to which bits of trim need to come out..


Ade

 

[Ade B]

Found this

Any suggestions?

Ade

 

[bolide]

I don't think the amp is under the passenger footwell so I suspect it's under the dash, driver's side

Mine has failed so I will resolder the connections & report back. If that fixes it it shouldn't take more than an hour in total to remove, resolder & refit

Nick Froome
*****************

 

[The G.F.P]

like i said on page 1 mine works upto 50 ish then judders and turns off if i keep trying to accelerate with it

but if i leave it at 45mph it works fine

any ideas because if it works then it cant be a dry joint

any info would be great

 

[FinlayM]

Today tried the cruise again and it worked for most of the outward journey.. Coming back it would engage and then disengage sometimes instantly other times after a couple of seconds..

Searching the interweb it appears it could be one of a number of issues:

1. Vacuum pipe leaks
2. Throttle actuator on its way out
3. Dry joints in the Amp (which I have still to locate - a pic would be super)
4. Something amiss with the brake circuit (the brake light triggers the cruise to disengage)
5. Iffy speedo cable (which I have at low speeds)

Wheels & tyres are stock and in good order.

Any ideas as to which sequence the above should be tackled..

TIA

Ade







l

I have exactly the same problem on the same model. Was any progress ever made with this??