Au falcon cruise not working

[2002au]

Hey guys, the cruise control in my s3 xr6 manual doesn't work. It come up with 'cruise' under the odo meter but that's it. Thinking its maybe the brake light switch?

Cheers guys

[2002au]

Also all the brake lights are working

[auIILTD]

Originally Posted by 2002au

Also all the brake lights are working

He's done this fellas.

[FOCUSonTHIS]

Could be the the cruise buttons on the steering wheel

[XRGhia]

Check your horn Cassidy... Could simply be dodgy switches, or a broken clock spring.

[Sox]

The clutch pedal may also be slightly down, resting on the switch.

[auIILTD]

There is a failsafe switch attached to the brake booster master cylinder (the only wires on the MC). I have had to replace this in the past as it stops the cruise from engaging. Pretty cheap to replace too if I remember correctly.

Good luck with it.
Stu

[2002au]

Ok cheers guys

Might sound stupid but is there anyway it check the cruise buttons on the wheel?

Also the horn works fine..

[FOCUSonTHIS]

Originally Posted by 2002au

Ok cheers guys

Might sound stupid but is there anyway it check the cruise buttons on the wheel?

Also the horn works fine..

Horn runs on a separate wire that connects to the airbag.

Only way to check if the buttons work is to take the airbag off. You will need the anti theft t-bits to remove the airbag. Then remove switches and check with a multi-meter.

That is my assumption, I am not the best with electrical

[auIILTD]

Originally Posted by FOCUSonTHIS

Horn runs on a separate wire that connects to the airbag.

Only way to check if the buttons work is to take the airbag off. You will need the anti theft t-bits to remove the airbag. Then remove switches and check with a multi-meter.

That is my assumption, I am not the best with electrical

No need to go though all that. Look at the wiring diagrams on this site and measure at the connector that runs down the steering column.

[Gaz]

Originally Posted by FOCUSonTHIS

Horn runs on a separate wire that connects to the airbag.

The horn buttons earth through the cruise module.

You've said the word cruise comes up, so the module is alive.

The horn buttons earth through the CC, but they also use the same earth in the clock spring. The volume buttons also use that earth, so if they work, the return wiring is definitely fine. The cruise buttons do have their own feed through the clock spring though.

I'd check the buttons/wiring for a voltage spike at the CC module across the Orange(Yellow trace) wire and earth, when someone presses either Set + or Set -. It will just be quick spike, and will be different for + and - buttons.

[Gaz]

Originally Posted by Gaz

I'd check the buttons/wiring for a voltage spike at the CC module across the Orange(Yellow trace) wire and earth, when someone presses either Set + or Set -. It will just be quick spike, and will be different for + and - buttons.

Seeing I can't edit that post. The above is slightly wrong.

You need to measure across the Orange-yellow wire and the black* wire.

*There seems to be 2 black wires on the cruise module plug, one goes to earth from the module, the other into the module from the buttons. I haven't checked their location on the plug, but one should show 12v between the orange and it with the cruise on ("Cruise" on the dash), the other should show 0v. That's the one you want. Press a set button and see if you see the voltage move.


Hope I got it right this time

[The Monty]

Id seriously just check your brake lights first, all three of them.

[GK]

Originally Posted by The Monty

Id seriously just check your brake lights first

+1

Exactly what you've described was caused by blown brake lights in my sedan.

GK

[The Monty]

Obviously paying more attention then what I am, lol. Sorry bout that.

[rmack]

You can bypass the booster switch for testing by unplugging and inserting a wire link into the plug. (NOT THE BOOSTER SIDE).