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Author Topic: Cruise control on my Vectra does not work  (Read 2250 times)

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terry paget

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Re: Cruise control on my Vectra does not work
« Reply #75 on: 11 July 2019, 20:18:12 »

My only other car with cruise is my PFL 2.5 Omega estate. I put the diagnoser on it, but its a 2000 car and does not give me brake or clutch switch data. I still wonder whether the clutch switch should go from active to inactive when the clutch pedal is depressed.
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Re: Cruise control on my Vectra does not work
« Reply #76 on: 11 July 2019, 20:27:00 »

My only other car with cruise is my PFL 2.5 Omega estate. I put the diagnoser on it, but its a 2000 car and does not give me brake or clutch switch data. I still wonder whether the clutch switch should go from active to inactive when the clutch pedal is depressed.
Completely different set up, so don't confuse yourself ;)

Don't forget the column on those goes in/out as well as up/down :y
I didn't know it did.
It's in the manual... ::)
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TheBoy

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Re: Cruise control on my Vectra does not work
« Reply #77 on: 13 July 2019, 10:22:00 »

Interesting discovery - depressing the brake pedal, brake switches both went from inactive to active; depressing clutch pedal, nothing changed, it read active pressed or relaxed. Contemplate.
So the ECU cannot see the clutch switch.

I'd check it by replacing clutch switch with a suitable bit of wire, to see if wiring OK (on live data only, not for driving), and if it makes no difference, then get a meter out and start checking the wiring.
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Re: Cruise control on my Vectra does not work
« Reply #78 on: 13 July 2019, 10:23:18 »

My only other car with cruise is my PFL 2.5 Omega estate. I put the diagnoser on it, but its a 2000 car and does not give me brake or clutch switch data. I still wonder whether the clutch switch should go from active to inactive when the clutch pedal is depressed.
To see the same stuff on that 2.5, you need to look at Cruise Control ECU, not engine ECU, as its a bolt on system.
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terry paget

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Re: Cruise control on my Vectra does not work
« Reply #79 on: 13 July 2019, 17:21:48 »

My only other car with cruise is my PFL 2.5 Omega estate. I put the diagnoser on it, but its a 2000 car and does not give me brake or clutch switch data. I still wonder whether the clutch switch should go from active to inactive when the clutch pedal is depressed.
Completely different set up, so don't confuse yourself ;)

Don't forget the column on those goes in/out as well as up/down :y
I didn't know it did.
It's in the manual... ::)
So it is, page 6. It moves quite a long way, too, quite a useful discovery.
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Re: Cruise control on my Vectra does not work
« Reply #80 on: 13 July 2019, 20:44:21 »

 :y
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terry paget

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Re: Cruise control on my Vectra does not work
« Reply #81 on: 14 July 2019, 15:46:34 »

Interesting discovery - depressing the brake pedal, brake switches both went from inactive to active; depressing clutch pedal, nothing changed, it read active pressed or relaxed. Contemplate.
So the ECU cannot see the clutch switch.

I'd check it by replacing clutch switch with a suitable bit of wire, to see if wiring OK (on live data only, not for driving), and if it makes no difference, then get a meter out and start checking the wiring.
I removed the clutch switch lead, and after a struggle inserted 2 wires in holes 3 & 4 of the socket. With the 2 wires unconnected, connected diagnoser, and discovered clutch switch was still 'active'. I removed the wires from socket, and diagnoser still said 'active'.
Looks to me that the 2 wires from the clutch switch are shorted together somewhere. I can see some white (masking?) tape around the pair of wires higher up, but can get neither a good photo or conclusive view.
Please advise.
Is the instrument panel easily removed, as on the Omegas?
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Re: Cruise control on my Vectra does not work
« Reply #82 on: 14 July 2019, 16:08:41 »

look at a wiring diagram first, and look for easy access points (connectors) in it. Then get the meter out ;)

I suspect you'll find a blown fuse.
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terry paget

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Re: Cruise control on my Vectra does not work
« Reply #83 on: 14 July 2019, 16:13:56 »

look at a wiring diagram first, and look for easy access points (connectors) in it. Then get the meter out ;)

I suspect you'll find a blown fuse.
As said before, I cannot find the cruise control or clutch switch wiring in the Haynes manual. Have I missed it?
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Re: Cruise control on my Vectra does not work
« Reply #84 on: 14 July 2019, 16:18:35 »

Check Fuse F120
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Re: Cruise control on my Vectra does not work
« Reply #85 on: 14 July 2019, 16:19:32 »

I've made an assumption its an Z18XER
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Re: Cruise control on my Vectra does not work
« Reply #86 on: 14 July 2019, 16:37:18 »

At Pin 4 on clutch switch, you should have 12v with ignition on. Please confirm.
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Re: Cruise control on my Vectra does not work
« Reply #87 on: 14 July 2019, 16:46:35 »

And look at...
https://www.motor-talk.de/forum/aktion/Attachment.html?attachmentId=758790

And scroll down a few pages until you see a simple diagram with P128161 in bottom right. This is clutch switch diagram, and the next page gives the initials/labels.


The lower bit of the diagram appears much much lower in link, on page P129040, pin 16 of main ECU.  So that gives you the complete schematics for the clutch switch to follow through, including 2 connectors between the clutch switch and the ECU, where you can do some continuity testing with a meter.
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terry paget

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Re: Cruise control on my Vectra does not work
« Reply #88 on: 14 July 2019, 17:35:28 »

No volts on pin 4, clutch switch socket, with ignition on.
Car is indeed Z18XER.
Could not find Fuse 120. Under bonnet are F1-F36; in boot F6-F29; LH end of dash F10-F26.
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terry paget

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Re: Cruise control on my Vectra does not work
« Reply #89 on: 14 July 2019, 18:09:42 »

Thanks for the wiring diagram. Now I must work out what it means.
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