Right i have had a look in the engine bay and the only connector i can find is the 20 pin in the pic that they plug the diagnostic machine into, not the other 20 pic that you say to use on the opposite side of engine bay, see pic of bay.
in the 20 pin diag port pin 8 is not connected, meant to be a grey wire and looked at wires going into the port and there is no grey wires.
Tried this on my mate's 1992 325i today - no joy!
Is there supposed to be a grey wire already connected to pin 8 of the X20 connector? There was on his - we wired the new wire in parallel with this rather than breaking the circuit. I assume it was the correct connector, as there was only one sat next to the fuse box!
His cluster also has just an opaque black panel where the 'check engine' light should be, although there was a space for a bulb.
Bulb fitted (and tested as working), and mods made to make sure that it would be visible if it worked. Tested all the wiring for continuity in situ after it was fitted, and all was fine.
This grey wire in pin 8 - does this remain plugged into pin 8 and the wire to the cluster tap off in parallel from that, or is it disconnected from wherever it disappears off to and then joined directly (as in pin 8 there connects directly, with the grey wire pretty much disconnected) to pin 16 of the white connector on the cluster?
Out of curiosity, what does that grey wire normally do exactly? No voltage of any kind seems to go through it regardless of key position or engine running.
afaik, is wired topin 8 in the ecu, and is only used for the diagnose. i dont really understand what you mean by this "parallel wiring" but let me put it this way: imagine your cel light wired directly to pin 8 in the ecu connector. is how the light should work. if you had a wire comming straight from pin 8 in the ecu to the pin 16 in the white connector, then you should see the CEL comming on when you switch the ignition. but euro spec e36 only has half the wire, from pin 8 ecu to pin 8 x20. if you continue from pin 8 (x20) to pin 16 in the white connector, you should be all right. if not, maybe there's something worng with the instrument cluster, especially since you said the CEL was blanked. maybe it's missing some wiring inside, i dunno. i think you should take a wire from pin 8 and measure if there's any voltage when you switch the ignition on. but try it with the 2 halves of x20 fitted together, not split. there should be some voltage in it with the ignition on.
Ah, I think I just assumed that pin 8 was connected to something else on the bottom half of the connector and continued onwards from there, so adding another wire to pin 8 would be creating a parallel circuit. We went into the top half and connected directly to that grey wire, and didn't look underneath at all.
Couldn't measure any kind of voltage on pin 8 at any time regardless of ignition position, so it might just be dead on his car. Wouldn't surprise me!
At least it was a damn good excuse to get the cluster out and remove the dead bug which had been sat in front of his speedo behind the plastic for a while!
|« Previous Thread | Next Thread »|