Hi _____,

You need Volvo schematics to work on electrical stuff.

Check fuse 31

+12V starts at the starter motor 6/25
there's an inline fusible link in the red wire
a branching point 23/7 (that I didn't see on the pictorial)
to pin 1A input of the engine fan relay 2/11
(2/11 is up top of the fan towards the passenger side)
Measure for +12V here first to see if the fusible link is gone!
this is constant +12V via the starter & fusible link hot or cold.

One or the other should work when the engine is hot.
two +12V outputs from engine fan relay :
Green at 1C to pin 2 of 6/29
Red at 2C to pin 1 of 629
The Engine fan motor 6/29
fan motor ground 31/55 on front of engine below pass. side intake manifold

EZK module (note the relay is triggered by the ECU grounding
the fan relay pins.)
(output 1) Yellow/white wire from pin 7 EZK to pin 1B fan relay
(output 2) Yellow wire from pin 22 EZK to pin 2B fan relay
31/33 is a critical ground for the EZK module

Find the Volvo 1995 850 wiring book: TP3907202 Nothing else comes close.
I had the schematic and location pictorial from the Volvo manual
but Brickboard gagged when I tried to upload the fan info.

If you remain stuck, email me and I'll send you the schematic.
See my profile for the email address.

Cheers, Bill