With the N10-3 plugged in I get 2.8 ohms at the non hot side of fuse 7.Then I am out of sensible explanations and will probably just waste your time here. I don't think a scan is going to help. With the key off, fuse 7 removed, and N10-1 disconnected, measure ohms resistance between the [edit: non-hot ] side of fuse 7 and each and every single pin on the N10-1 harness... And report back any readings that aren't O/L or infinite.
BTW (and completely unrelated to your issue) it looks like the "variable illumination" of the roof switch is an LED.
What were you measuring to? Chassis ground?With the N10-3 plugged in I get 2.8 ohms at the non hot side of fuse 7.
With the N10-3 unplugged I get 32 Meg ohms at the non hot side of fuse 7.
With the N10-3 unplugged and the self-dimming rear view mirror unplugged I get O/L at non hot side of fuse 7.
Yes, I do have one, and yes, I was measuring to chassis ground. Luckily the fan motor (2 leads) has a separated connector that plugs into the N10-3 Module connector. There is a black release on the bottom side that lets you remove the fan plug.That's a great clue about the blower motor inside the apparatus box (the box where N10-3 and all the other modules live). You probably do have one. I don't know about the FL years, but it's been present on all pre-FL models I've ever seen. That blower motor is not documented anywhere in WIS, and they apparently fail quite frequently. In fact, I've never encountered an R170 in the wild with a working one. And I've never seen one where this blower caused problems on the N10-3. Look for a small "chimney", and look down in for the squirrel cage.
IIRC you can remove the pins for the blower motor from the big N10-3 connector without cutting anything.
Getting back to your diagnostics, you said:
What were you measuring to? Chassis ground?
Exactly how do you unplug the connector? I don’t see a black release anywhere, thanks.I've bought my 2001 SLK 230 new in 2000 and have never heard the module cooling fan run.
Thanks for the fan information. I'll probably call my indy/parts guy about a replacement.
Look at the bottom of the N10-3 connector and you should see a black plastic piece holding the grey plug in place. You need to slightly move the black plastic piece just enough to release the grey fan plug. If you were to re-install the fan plug, it would snap into the module.Exactly how do you unplug the connector? I don’t see a black release anywhere, thanks.