Z4 on board computer fault

[MikeH54]

Ok thanks for the advice I've got a multimeter that works how difficult is to track down a circuit diagram
. Do BMW publish them at all..

 

[MikeH54]

What is it on ebay you are trying to buy for £25?

This might help with removing the trim

https://www.newtis.info/tisv2/a/en/...wheel-alignment/32-31-steering-column/Fdguo6G

Was thinking of a replacement indicator stalk. Good schematic of the lower cover presume the steering column goes down to remove the upper cover..

 

[philiper]

I got the stalk as well, in case if you need it

 

[philiper]

Just like to thank you all for your efforts on my behalf. Am happy to have a go at getting the stalk out though the sites I've seen say remove the steering wheel and whilst I've got the tools I'd be a bit nervous about the airbag, even with the battery disconnected. If anybody's done the indicator stalk without removing the wheel it would be good to know.

I'm still not sure how to test it without a circuit diagram unless I bought a replacement, there's one on eBay for £25.00, new they're nearly £70.00, and just swapped it out. Could always sell it if it didn't change anything.
Thoughts..??

I found this, so looks like you might be right removing the steering wheel (it is not a big deal, scary but do it right, nothing will go wrong)

https://www.pelicanparts.com/techar...8-ELEC-Steering_Column_Switch_Replacement.htm

 

[MikeH54]

Yeah thanks for this it's confirmation of what I suspected this morning, took the covers,top and bottom off and there isn't enough room to get at the bolts.
So am planning to do a swap out of the stalk as i found one for £9.00 and its worth that to move the problem on. I noticed on the connector there are only 4 wires going into the loom. So given the functions left, right, dip/main and BC would I be right thinking the switch would be be earthed in the screw connections fixing it to the column??

 

[Zed Carer]

Seeking some advice on what could be causing the OBC to not show any information when depressing the stalk. The display seems to be working fine as the clock, service indication all seem Fine and when I first drove it did display the range of miles but Wouldn't switch to show other features. I did change the battery but since then even the range indication no longer shows..I have had the binnacle out but nothing obvious and ideally want to avoid having to send that away if possible

Not sure if changing the battery could be a factor? When I changed the battery last year in our Z4 everything seemed to be OK except for the air con. After searching I found out that when the battery is removed the car goes into transit mode; i.e. it basically shuts down and in our case the air con didn't "wake up" when the new battery was fitted. Luckily it only cost me £40 to get it diagnosed and sorted.

 

[MikeH54]

Hi zed carer thanks for the info, how did you get the aircon reawakened was it a dealership issue?

 

[Zed Carer]

Hi zed carer thanks for the info, how did you get the aircon reawakened was it a dealership issue?

I have used a local Bosch Service centre for over 12 years and their diagnostic equipment was able to clear the battery fault code and that sorted the air con.

 

[MikeH54]

Ok thanks for the information could do with getting the codes checked

 

[MikeH54]

So after a rather embarrassing pause in the proceedings the problem has now been successfully resolved thanks to a combination of suggestions so big thanks to all contributors.
I took the car to a local BMW independent with a high rating #3 in all of Wales so was reasonably confident they knew what they were talking about.
They put one of their diagnostics to work and low and behold it diagonosed an internal short circuit in the switch when the BC button was depressed. Hence confirming the fault was in the stalk. As I had the replacement that I bought for £9.00 Off eBay with me I got them to change it out. In all they charged me 1.5 hours labour for the switch and diagnostics, which came to £89.00. Inc VAT. They even dropped me at a local Costa and picked me up which saved me about 10.00 in taxi fares. All in all
a great result
The Garage is Waterfall Garage in Bridgend run by John and Chris who are true enthusiasts and I recommend them for their knowledge and service. None of your Main dealer eat your breakfast off the floor glitz but down to earth expertise and passion with Lotuses and Alfas dotted about the space.

 

[MikeH54]

Just want to say big thanks to all for your help and interest

 

[t-tony]

Good info Mike, especially for members in that area. Thank you.

Tony.

 

[Redline]

Always the simple things

Glad it’s sorted. Now you can find out how much go-juice you’re using in real time

 

[philiper]

Good news and glad all is well now

 

[MikeH54]

Many thanks to you both. I learned a bit about current generation switches in that there no switched voltage like in my day its all signals to one of the many management units. Makes the switches hard to trouble shoot I understand so getting the sophisticated diagnostic was definitely the key.

 

[Layor]

Well done, Mike. I'm pleased for you .
Colin.