random error messages, temperature reset

[Demostenes]

Hello,

I have following problem. My instrument cluster is showing random errors like check rear lights, check brake pads, check coolant, etc...but everything is OK. Also sometimes it stops making ticking sound when using directional lights, does not display that I have distance lights turned on, or even temperature information is reseted to -20 or 13,5 degrees (C), or other random nonsense number. After few minutes it starts work again. I changed whole instrument cluster, but problems are still there, so it is definnitely not in insturment cluster. Did anybody experienced similar problem? Thanks in advance.

[larrym3711]

Can someone confirm that Demostenes's instrument cluster is controlled by the "GM" controller? Could the "LM" controller be involved too?

larrym3711
2001 540iA Sport

[Demostenes]

http://www.bimmerboard.com/members/q...01995-1998.jpg According to this picture there are both.

[Qsilver7]

No...the instrument cluster (IKE) is NOT controlled by the GM. In fact, the IKE can kind of be considered the "master gate keeper" of control modules in that, in the communication bus system, all buses run through the IKE as they pass or receive data/info from other control modules.

The GM, though not the "master gate keeper", is also a lesser gate keeper in that all components on the P-bus pass & receive data through the GM.

Hopefully the topological chart below will make sense to you:

[Demostenes]

Thanks, great picture!

[Demostenes]

Thanks, great picture!

We tried almost everything, including disconecting LCM and GM (to verify if problem is there), but it didnt help.