Cheap BMW 3 Series Window Switch

No — the E46 (1998–2006) and E90 (2005–2013) are entirely different generations with different door furniture, connector designs, and switch panel layouts, so they are not interchangeable. You must source a switch from the correct generation for your car. Check your V5 or registration against the breaker's stock to confirm the right generation before buying.

Yes, it can — on the E46 and E90 generations BMW offered both 3-door (compact/coupe) and 4-door (saloon) and 5-door (touring/estate) body styles, and the door configurations can affect the master switch panel layout, particularly on the driver's door where the switch array reflects how many windows the car has. Always tell the breaker your exact body style (e.g. saloon, coupe, touring) when requesting a quote. A switch from a 3-door coupe is unlikely to be a straight swap into a 4-door saloon.

Trim level — whether SE, Sport, M Sport, or ES — does not fundamentally change the fitment of the window switch itself, as the switches are determined by generation and body style rather than trim grade. You may find minor cosmetic differences in finish or button style between trim levels, but these are aesthetic rather than a fitment barrier. Confirm the exact part number with the breaker against your registration to be sure.

The E90 received a facelift (LCI) in 2008, and while the body shell and many components carried over, interior switches can differ between pre- and post-facelift cars due to changes in connector pinouts or switch design. You should treat pre-2008 and post-2008 E90 switches as potentially different parts rather than assuming they swap freely. Route this question to the breaker with your full registration so they can match the correct part.

2003 falls within the E46 generation (1998–2006) and most 2005 cars also sit within the E46, so there is a reasonable chance of compatibility — however the E46 ran alongside the early E90 from 2005, so it is important to confirm the donor car is also an E46 and shares the same body style as yours (saloon, coupe, touring, or compact). Confirm body style, side (NS or OS), and part number with the breaker before purchasing. Never assume fitment purely on year alone.

Yes — window switches are side-specific, so the nearside (NS, passenger/left) and offside (OS, driver/right) switches are different parts, particularly because the driver's door master switch panel typically controls all windows whereas the passenger switch only controls that door's window. Always specify NS or OS clearly when contacting a breaker. Getting the wrong side means the switch will not match the door card cutout or wiring position.