Ok, the most common areas are a broken wire inside the rubber tubing that protects the wires - these can break. You may be able to remove the grommet and check the wires that way -
On this diagram, the wiring plug should be a 6 pin black plug.
6202 : front left-hand door lock assembly
The wires are:
622 : deadlocking + control
6232 : closing locking output
6233 : opening locking output
6285 : Left-hand front door open switch input (BSI)
M6202 : EARTH m6202
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