Ok, I have been trying to figure this out the last couple days, and been tracing all the wires in the ETM. Let me give you a background:
-Early model eta (1985)
-I have traced wires from x20 to black and yellow/white wire on c104 and shows continuity.
-I have tracked from x6000 dme plug to x20 and c104 and all shows continuity.
-I have traced c104 to blue plug on gauge cluster (pin 7 and 11) and shows continuity.
When everything is hooked up, I don't get any signal for economy or tach.
The only thing I cant do is check for a signal from dme to blue plug in back of cluster because its a square wave.
I have tested 3 clusters (two 325i and my old eta) I am not 100% sure on the working condition of the 325i clusters, but my eta one worked 100%. I know the coding on the eta cluster is wrong but the tach should still show something?
Could there be a bad ground? could all 3 clusters be crap? can I check signal from dme without an oscilloscope?
HELPPPP thanks!
-Early model eta (1985)
-I have traced wires from x20 to black and yellow/white wire on c104 and shows continuity.
-I have tracked from x6000 dme plug to x20 and c104 and all shows continuity.
-I have traced c104 to blue plug on gauge cluster (pin 7 and 11) and shows continuity.
When everything is hooked up, I don't get any signal for economy or tach.
The only thing I cant do is check for a signal from dme to blue plug in back of cluster because its a square wave.
I have tested 3 clusters (two 325i and my old eta) I am not 100% sure on the working condition of the 325i clusters, but my eta one worked 100%. I know the coding on the eta cluster is wrong but the tach should still show something?
Could there be a bad ground? could all 3 clusters be crap? can I check signal from dme without an oscilloscope?
HELPPPP thanks!
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