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If the electric mirrors on your BMW E46 are not functioning, there are several troubleshooting steps to pinpoint the issue. Start by checking the fuse that controls the mirrors, as it is often the easiest and least expensive fix. Refer to your owner's manual to locate the mirror fuse in the fuse box and examine it under light to ensure the filament is intact. If the fuse is blown, replace it with one of the same amperage. If the fuse is fine, inspect the switch next. It's possible that the switch's electrical connector may be disconnected or the wiring damaged. If the connector is still attached, unplug it and examine the pins for corrosion or damage.
If the electric mirrors on your BMW E46 are not functioning, the issue is typically related to the fuse powering the mirrors.