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post #1 of 24 Old 30th October 2014, 09:12 PM Thread Starter
Burnout_187
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Cruise control fix

Symptom: Cruise control does not activate, when green light is on. Or activates for few seconds and then disengages.

I had error code for brake pedal switch so i assumed that was the problem. Allso in TIS repair instructions it says that brake pedal switch is problem for those symptoms. After change, no difference.
After that searched for cruise control module, found one at realoem for M5, part number: 65718375497.
Ordered it from ebay and was ready to change it but i could find it. Seems that M5 does not have one, regarding realoem says that it has.

Okay, last change. gear position switch...Nbr #1




well, it wasn't switch itself, it was spring behind it.




Here is the location for the switch.








You need 22mm spanner, open switch, remove it. Then remove spring and pin. Replace spring and put it back in right order. Tighten it and your cruise control should work now.
Partnumber for spring: 23 31 7 511 337

Luckily i had my old gearbox lying around so i got spare parts immediately.
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post #2 of 24 Old 30th October 2014, 11:27 PM
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Thanks! I need to do this!

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post #3 of 24 Old 31st October 2014, 03:52 AM
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Thanks! I need to do this!
Just curious, how do you know you need to do this? This is a pretty rare failure.
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post #4 of 24 Old 31st October 2014, 04:31 AM
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Quote:
Originally Posted by 68FB View Post
Just curious, how do you know you need to do this? This is a pretty rare failure.
Well my cruise control isn't working. Green indicator comes on but won't set at speed. I don't think it is the brake pedal switch as my lights work fine. Also I don't think its the neutral safety switch as the car won't start if the clutch isn't pressed in. That leads me to believe it's this spring. I've heard of it breaking on more than just this guys car so it must not be all that rare.

2000 M5
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Mk4 navigation computer, 16:9 navigation, 2015 maps
Sirius/Aux retrofit
E60 545i shifter, F10 M5 shift knob
Dinan adjustable RSB
Euro spec facelift headlights/tail lights
LCMIIIB and RLS for auto headlights
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post #5 of 24 Old 31st October 2014, 03:14 PM
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Quote:
Originally Posted by tmaschm View Post
Well my cruise control isn't working. Green indicator comes on but won't set at speed. I don't think it is the brake pedal switch as my lights work fine. Also I don't think its the neutral safety switch as the car won't start if the clutch isn't pressed in. That leads me to believe it's this spring. I've heard of it breaking on more than just this guys car so it must not be all that rare.
Another possibility may be your gear indicator switch and reverse light switch on the transmission. It may have fell loose, or switched if you did any transmission work as both cables plug into the same style connectors. I had the same issue and mine were plugged into the wrong connector. Easy way to tell is if you are in any gear do your reverse lights turn on ?. When the gear indicator switch is plugged into the reverse light cable the car does not know what gear it is in hence no cruise. Easy fix if that is the case.

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post #6 of 24 Old 31st October 2014, 03:44 PM Thread Starter
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Quote:
Originally Posted by rvt1000 View Post
Another possibility may be your gear indicator switch and reverse light switch on the transmission. It may have fell loose, or switched if you did any transmission work as both cables plug into the same style connectors. I had the same issue and mine were plugged into the wrong connector. Easy way to tell is if you are in any gear do your reverse lights turn on ?. When the gear indicator switch is plugged into the reverse light cable the car does not know what gear it is in hence no cruise. Easy fix if that is the case.

In prefacelift cars they are same, facelift cars they have different connectors.
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post #7 of 24 Old 31st October 2014, 04:08 PM
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If you have the transmission down for clutch change it is a good idea to change all the springs and little parts specially item 16.
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post #8 of 24 Old 31st October 2014, 04:35 PM
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Quote:
Originally Posted by Burnout_187 View Post
In prefacelift cars they are same, facelift cars they have different connectors.

good to know

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post #9 of 24 Old 31st October 2014, 05:23 PM
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Quote:
Originally Posted by tmaschm View Post
Well my cruise control isn't working. Green indicator comes on but won't set at speed. I don't think it is the brake pedal switch as my lights work fine. Also I don't think its the neutral safety switch as the car won't start if the clutch isn't pressed in. That leads me to believe it's this spring. I've heard of it breaking on more than just this guys car so it must not be all that rare.
In NA, cars had two clutch switches up to 09/2001. One was a Hall effect switch used by the DME for ABS, DSC, and cruise control (S32 in WDS), and the other was a conventional switch (S235) used for the start lock.

But if your S32 switch was bad, I would have expected you to have code 50 (hex 80), the one with the weird "switch chain grip" description, and no green light on the dash, so it sounds like you are on the right track.

I have seen those switch pins damaged but it was the roller and axle on the end getting chewed up, not the spring breaking like that, although maybe the one leads to the other. I replaced this pin a couple of years ago due to worry about the catastrophic damage it can do to the tranny. The old one was like new.
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post #10 of 24 Old 31st October 2014, 05:38 PM
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Could the status of these switches be viewed with INPA?

- Darrell

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