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Paul_540i 
Senior Member II
Joined: 20-January-2005
Location: Edinburgh
Status: Offline
Points: 214
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 Topic: Cruise control not working (E34)
Posted: 23-January-2005 at 17:20 |
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My cruise control does nothing regardless of the direction the switch
is pressed. Checked the fuse and tried pulling up on the clutch but no
joy. Brake lights are working so safe to assume the brake switch works
OK. Where is the clutch switch located, I read somewhere that it's not
on the pedal itself?
If that checks out OK what is the next thing to investigate, actuator
itself? Finally does the cruise control have a warning indicator to
show that it's active?
Cheers
Paul.
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540i 6-speed manual (sold)
840Ci 6-speed manual (sold)
318is (sold)
Yamaha R1 (sold)
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Jimbonic
Senior Member I
Joined: 24-February-2004
Location: United Kingdom
Status: Offline
Points: 109
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Posted: 04-February-2005 at 08:41 |
As far as I'm aware, there is no operating light for the cruise control.
I have had the same problem on mine, since I bought it, but have just left it as a) most of my mileage is along back roads, and b) I've got other things to sort out first! But, if you find a solution, I would be most interested to find out what you did.
I believe that there is a control module that looks after the cruise control, but that is purely from memory and could be a complete lie!!! There are others more knowledgeable about such things on this forum...
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Jimbonic
1989 535iSE Manual, Sport pack, Leather, Climate Control
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Jimbonic
Senior Member I
Joined: 24-February-2004
Location: United Kingdom
Status: Offline
Points: 109
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Posted: 20-May-2005 at 05:23 |
I thought I'd bring this back to the fore, to see if anyone has any ideas as to how best to breathe life back into an unserviceable cruise control. I'm popping over to Belgium/Germany in a few weeks, so it would be nice to have the relaxing option of slipping into cruise control for the sprint along the Autoroutes/Autobahns.
Any ideas gratefully received.
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Jimbonic
1989 535iSE Manual, Sport pack, Leather, Climate Control
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e34m5
Really Senior Member II
Joined: 26-June-2003
Location: Near Rugby, Warwickshire
Status: Offline
Points: 1344
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Posted: 20-May-2005 at 08:22 |
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Could be a faulty cruise control module ? (In the electronics box in the engine bay next to the engine ECU).
The switch is on the "clutch pedal support bracket" according to Bentleys.
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Jimbonic
Senior Member I
Joined: 24-February-2004
Location: United Kingdom
Status: Offline
Points: 109
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Posted: 20-May-2005 at 09:04 |
Thanks Mr e34m5.
What does the "switch" do? I was under the impression that all control was via the steering wheel stalk. 
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Jimbonic
1989 535iSE Manual, Sport pack, Leather, Climate Control
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e34m5
Really Senior Member II
Joined: 26-June-2003
Location: Near Rugby, Warwickshire
Status: Offline
Points: 1344
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Posted: 20-May-2005 at 10:19 |
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The clutch pedal switch disengages the cruise control when you use the clutch.
Miles
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Jimbonic
Senior Member I
Joined: 24-February-2004
Location: United Kingdom
Status: Offline
Points: 109
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Posted: 20-May-2005 at 10:41 |
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Ah, I see. Thank you. Are there switches on the throttle and brake pedals as well? Or do these interrupt the cruise control in another way?
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Jimbonic
1989 535iSE Manual, Sport pack, Leather, Climate Control
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e34m5
Really Senior Member II
Joined: 26-June-2003
Location: Near Rugby, Warwickshire
Status: Offline
Points: 1344
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Posted: 20-May-2005 at 10:53 |
 Jimbonic wrote:
Ah, I see. Thank you. Are there switches on the throttle and brake pedals as well? Or do these interrupt the cruise control in another way? |
It looks like the switch for the brake pedal is an extra set of contacts in the normal brake light switch, if you can find it there should be 4 wires coming out of it and 2 from the clutch pedal switch....
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Jimbonic
Senior Member I
Joined: 24-February-2004
Location: United Kingdom
Status: Offline
Points: 109
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Posted: 20-May-2005 at 11:06 |
Thanks very much. I think I have my weekend's work sorted now...
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Jimbonic
1989 535iSE Manual, Sport pack, Leather, Climate Control
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Andyboy
Banned User
Joined: 04-June-2003
Status: Offline
Points: 707
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Posted: 20-May-2005 at 15:12 |
I fitted cruise control to an E34 recently.
The clutch switch is on a bracket that bolts (with a
single 10mm nut and washer) to the pedal box. It
looks like a brake light switch but they are not the
same. 
If you can wait a couple of weeks, I have two or three
complete E34/32 cruise control kits. I would imagine
the problem is the ECU. It fits under the bonnet, in
the big black box in the rear driver's side corner (four
big crosshead screws). It's the smallest alloy ECU
with the blue plug.
Other things to try; do your brake lights work? A faulty
brake light switch may well just render the whole lot
u/s.
Clutch switch - the pedal needs to be pressing the
button in all the time. If the pedal has been adjusted
for height after a clutch job, this will permanently
disable the cruise control. Drop the lower dash
panel down and you'll see it.
I tell you what, having had a couple of cars with c/c, I
wouldn't want a car without it now.
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Andyboy
Banned User
Joined: 04-June-2003
Status: Offline
Points: 707
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Posted: 20-May-2005 at 15:15 |
If you are at Rockingham this weekend (Sunday), you
can try the cruise ECU from mine and see if it works.
If it does, you know what the problem is and I can
sort you out an ECU. They're in a cardboard box.
Somewhere........... 
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Jimbonic
Senior Member I
Joined: 24-February-2004
Location: United Kingdom
Status: Offline
Points: 109
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Posted: 23-May-2005 at 09:23 |
Thanks, Andy.
Due to PC melt-down, I haven't checked the forum 'till today, so I guess we've missed the boat on Rockingham!!
I'm going to check the part number out, so that at least I've got a fighting chance of knowing what I'm talking about!! Then, perhaps, I can try a few things out...
Thanks for all your help 
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Jimbonic
1989 535iSE Manual, Sport pack, Leather, Climate Control
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Cruise control not working (E34)
