BMW WDS / wiring info can be accessed via https://www.pss-autosoft.net/diagrams/bmw/release/en/
It can be a little fiddly to get working on modern browsers but it seems to work fine in IE 11 on my Windows 10 workstation.
E46 specific WDS can be found here: https://www.pss-autosoft.net/diagram.../e46/index.htm
The labelling can be a little tricky to comprehend if you're not familiar with WDS but the following table should help you understand the colours and pin numbering etc
It can be handy to print the section you are interested in to PDF for future reference / printing without having to fight your way around WDS again
It can be a little fiddly to get working on modern browsers but it seems to work fine in IE 11 on my Windows 10 workstation.
E46 specific WDS can be found here: https://www.pss-autosoft.net/diagram.../e46/index.htm
The labelling can be a little tricky to comprehend if you're not familiar with WDS but the following table should help you understand the colours and pin numbering etc
It can be handy to print the section you are interested in to PDF for future reference / printing without having to fight your way around WDS again