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Is my CEM bad? V70-XC70 2007

posted by  Chris Mullet on  Fri Aug 3 22:27 CST 2018
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last visit: Fri Oct 24 09:08 CST 2014
[RELATED]

I'm looking at page 81 of this wiring diagram:

http://www.volvowiringdiagrams.com/volvo/XC70%3AXC90%20Wiring%20Diagrams/TP3998202%202007%20V70%20V70R%20XC70%20XC90%20Wiring%20Diagram.pdf

It appears that the power path goes: (Battery) - fuse - Light switch (3/111) - CEM (4/56) - Thru a disconnect (54/23) that I don't know where it is, firewall? - RH Headlight (10/2).

It looks like a single power source ( no LH/RH differentiation) until it goes through the CEM. Coming out of the CEM there is a blue/yellow that passes thru the disconnect and continues as a blue/yellow to the R/H Dipped Beam bulb. For the L/H side, it's a Blue/White out of CEM, passing through the other disconnect, continuing to the L/H bulb as a blue/yellow.

So the problem lies somewhere between the CEM and the bulb, including a mid-course disconnect. So in theory you can probe the R/H blue yellow wire at both the CEM end and the Bulb end and draw a conclusion as to where the break is.






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