for all with BMW imported from Japan

[shogun]

Japanese spec. BMW (of the older generation like E34/32) have a temperature feeler at the end of the cat. If the temp exceeds 800 degree Celisius, there will be a warning in the check control and the gong will give alarm.
I just helped someone with a 1989 E32 750iL in Canada who had a permanent warning, even when the cat was cold. gong gong gong gong gong...........

Going thru the files I found that there is a thermo switch under the rear seat (E32). Asked him to pull K13 and the problem was solved. The thermo switch is defective and always gives alarm.
With this also the other typical japanese starting procedure tests are gone, that means in the check control
-see owners manual
-cat
-gong test

Just in case you have such a prob, look for this yellow thermo switch in your car, in the E32 it is the one on top of pic one (yellow relay)
http://www.bimmerboard.com/members/b...r/CIMG0163.jpg
http://www.bimmerboard.com/members/b...r/PIC_0028.JPG
http://www.bimmerboard.com/members/b...r/PIC_0029.JPG
http://www.bimmerboard.com/members/b...r/PIC_0030.JPG
http://www.bimmerboard.com/members/b...r/PIC_0031.JPG

Another solution:
the cable white/purple/yellow goes from this module to another plug on pin 20
to the CCM. If you cut off this cable and connect it to ground, that has the same effect.