[Revoltos]

Struggled to find anyone who has had this issue via google so thought I would ask here. I noticed a couple of weeks ago my down shifter wasnt working. The up shifter was fine. I took my air bag off yesterday to check connections, everything seemed fine. Today niether of them are working! Does this seem like it could be an issue with the little steering wheel loom behind the air bag. Triptronic on the gear shifter is absolutely fine.

Cheers all.

[IK6SPEED]

Originally Posted by Revoltos

Struggled to find anyone who has had this issue via google so thought I would ask here. I noticed a couple of weeks ago my down shifter wasnt working. The up shifter was fine. I took my air bag off yesterday to check connections, everything seemed fine. Today niether of them are working! Does this seem like it could be an issue with the little steering wheel loom behind the air bag. Triptronic on the gear shifter is absolutely fine.

Cheers all.

Does down shifter plug into up shifter on U.K. RHD cars?

[Revoltos]

I believe it does share a connection. I purchased a new loom for the shifters from BMW and tried another down shifter and still nothing. Up always works. Down is dead.

[IK6SPEED]

Originally Posted by Revoltos

I believe it does share a connection. I purchased a new loom for the shifters from BMW and tried another down shifter and still nothing. Up always works. Down is dead.

If you tried another down shifter and still dead, and the down shifter plugs into up shifter, than the issue is clearly in the up shifter.

[Revoltos]

Do you think it could be that? I never thought the up shifter could be to blame as it has always worked. I'll swap it back to the standard msport one tomorrow and report back.

[IK6SPEED]

Originally Posted by Revoltos

Do you think it could be that? I never thought the up shifter could be to blame as it has always worked. I'll swap it back to the standard msport one tomorrow and report back.

The down plugs into the up....that’s what I wanted to verify on RHD cars, same as LHD.

The up then passes BOTH SIGNALS on a bus. The up is working, so the wiring is working.

Obviously the UP isn’t passing through the commands from the down shifter, as you have tried another down shifter.

That’s really the only thing left as you have eliminated the other obvious factors.

[Revoltos]

Originally Posted by IK6SPEED

The down plugs into the up....that’s what I wanted to verify on RHD cars, same as LHD.

The up then passes BOTH SIGNALS on a bus. The up is working, so the wiring is working.

Obviously the UP isn’t passing through the commands from the down shifter, as you have tried another down shifter.

That’s really the only thing left as you have eliminated the other obvious factors.

So I got around to trying this the other day, swapped the up shifter to a spare and no luck. Still works going up but not going down. I cant seem to find any wiring diagrams in my Bently book to check the steering wiring to FEM wiring. Does anyone know where there is a resource to check it out?

[IK6SPEED]

Originally Posted by Revoltos

So I got around to trying this the other day, swapped the up shifter to a spare and no luck. Still works going up but not going down. I cant seem to find any wiring diagrams in my Bently book to check the steering wiring to FEM wiring. Does anyone know where there is a resource to check it out?

Top is M Steering Wheel, bottom is non-M. The difference is the color of 1 wire between the paddle and the steering column switch cluster.

As you can see from diagram and I have attempted to tell you, if the up paddle is working, it’s not the wiring to the steering column cluster or subsequent wiring to the FEM.

[Revoltos]

Thanks for the diagram. It does seem a simple setup. I have put a new steering wheel loom in and tried another set of shifters but there has been no change. I understand the circuit sends two signals via a resistance change in the circuit. Each shifter creates a different resistance. Im wondering if its the FEM or the gearbox shift control module that interprets the signal then passes it on? There are other failure points in tbos setup.

[IK6SPEED]

Originally Posted by Revoltos

Thanks for the diagram. It does seem a simple setup. I have put a new steering wheel loom in and tried another set of shifters but there has been no change. I understand the circuit sends two signals via a resistance change in the circuit. Each shifter creates a different resistance. Im wondering if its the FEM or the gearbox shift control module that interprets the signal then passes it on? There are other failure points in tbos setup.

Looking at the diagram, I do not think that is true.

david51

[Revoltos]

Well something else is clearly at fault here. Thanks for your help anyway David. Think it will be a trip to BMW now.

[IAmATeaf]

Originally Posted by IK6SPEED

Looking at the diagram, I do not think that is true.

david51

If he’s tried a new loom and shifters it must logically be the unit that is interpreting the signals that the shifters are sending no?

[IK6SPEED]

Originally Posted by IAmATeaf

If he’s tried a new loom and shifters it must logically be the unit that is interpreting the signals that the shifters are sending no?

I still think it’s the paddle and he should try another known working pair at the same time.

[Revoltos]

I put my original set of m sport shifters back on. They worked fine up in till the day I swapped them for F80 ones. The F80 ones worked fine for months and then the down stopped working. Putting my old ones back on (also with the battery disconnected as I had the airbag out) did not sort the issue. To have two sets of paddles fail is very unlikely.

[XxThe_RemedyXx]

Had the same issues with my paddles. BMW replaced these parts under warranty:

61-35-8-707-674 - Front Control Unit
61-31-9-351-143 - Switch Unit Steering
32-30-6-854-771 - Connecting Line, Steering

[Revoltos]

Bloody hell. It would appear BMW fired the parts cannon at the problem then XxThe_RemedyXx? Did they give any information to you regarding why they changed the loom, the szl and the control module?

[aps]

Any solution to this? I am having a different issue but still with only the down shift.

I installed F80 paddles back in June and have had zero issues until last week. Now, at random times when I click the downshift, it downshifts twice instead of once... very annoying especially when trying to go from 3 -> 2 and instead it jumps from 3 -> 1.

I've checked to see if it's getting stuck or if I'm holding it too long, but it seems completely random. At this point, wondering if the wiring is going bad...

[aps]

Originally Posted by Anshu

Any solution to this? I am having a different issue but still with only the down shift.

I installed F80 paddles back in June and have had zero issues until last week. Now, at random times when I click the downshift, it downshifts twice instead of once... very annoying especially when trying to go from 3 -> 2 and instead it jumps from 3 -> 1.

I've checked to see if it's getting stuck or if I'm holding it too long, but it seems completely random. At this point, wondering if the wiring is going bad...

Bump, still getting this issue although even more sporadically. Sometimes it doesn't happen for days - enough that I feel comfortable that the problem is gone, and then all of a sudden it will happen - keeps catching me off guard.

It has yet to fail entirely though, so not like the signal is not being received...

[IK6SPEED]

Originally Posted by Anshu

Bump, still getting this issue although even more sporadically. Sometimes it doesn't happen for days - enough that I feel comfortable that the problem is gone, and then all of a sudden it will happen - keeps catching me off guard.

It has yet to fail entirely though, so not like the signal is not being received...

Clearly an issue with paddle electronics where the circuit is detected complete.

[Orion4]

Does your shifter (not the paddles) work correctly for both up and down shifts when in Manual mode? I had a similar issue on my 08 E90 335 and the cause was several broken/frayed wires in the shifter harness. See this thread for reference: https://www.e90post.com/forums/showt...ghlight=Orion4

[aps]

Originally Posted by IK6SPEED

Clearly an issue with paddle electronics where the circuit is detected complete.

Can you expand a little? Do you mean the circuit is detected complete twice? I'm not the most electrically inclined...

I'm not sure how to go about isolating which part of all the electronics is the problem. Other than just swapping out harnesses and paddles.

Originally Posted by Orion4

Does your shifter (not the paddles) work correctly for both up and down shifts when in Manual mode? I had a similar issue on my 08 E90 335 and the cause was several broken/frayed wires in the shifter harness. See this thread for reference: https://www.e90post.com/forums/showt...ghlight=Orion4

No problems with the actual shifter. Have been using that in manual mode most of the time over the last couple weeks.

[IK6SPEED]

Originally Posted by Anshu

Can you expand a little? Do you mean the circuit is detected complete twice? I'm not the most electrically inclined...

You nailed it.