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As a general rule, if you've got one circuit impacting another unrelated circuit then it'll be one of two things - a short-circuit or an earth fault.
I'd start by looking where anyone has worked on it previously, as most people seem to be utterly incapable of doing any auto electrical work to a decent standard, including so called "professionals". All too often you'll find that they've bodged something together to fix a symptom and not the underlying cause, and as a result you'll find odd issues like circuits not being fused where they're supposed to be.
Oh, and the door lock modules can and do fail despite what was said earlier. I had to replace two of them on my current 306 when I bought it because they were faulty.
1990 Peugeot 205 GTi 1.9 // 1991 Peugeot 205 GTi 1.9 16v // 1992 Peugeot 205 GTi 1.9 // 1999 Peugeot 306 HDi Estate
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Not taking the pee but how good is his wiring? Sounds like the window wire in the door loom is touching the cl wire...
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Very good actually tbh.
He builds pcs and circuit boards for fun.
To rule it out...he opened all the looms and undid all his work...
No change
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Fair enough then, should know what he's doing lol!
