Central locking question

[Orchid70]

Volvo 940 - 1996 year model, Sweden sold.
My rear passanger side central locking is not working. All other locks work.
But the motor for the cetral lock does work when I put electricity to it.
So the problem must be somewhere in the wiring.
Where?
Could somebody help me where to find where to measure the wiring out to the central lock motor itself?
I would like to know where the different connectors are hidden so I can measure resistance between them.
The wiring diagram I have in the Haynes bok does not help much.

I have changed the (heater) fan and had to desconnect the groundings under the ECU box in the footwell on the right side (pessinger side). Its not so that it could be a bad grounding...???

[93Regina]

Volvo 940 - 1996 year model, Sweden sold.

1994-940

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[Orchid70]

Thank you 93Regina!

I did find the problem - I found the C149 connector well hidden inside the pillar and groundwire had no connection.
Broken wire between body and door - inside the rubber protection.