OEM Volkswagen rear left (driver's side) power window motor with integrated electronic door module for the Passat B5/B5.5 Wagon. Part number 3B9839751BG (also written as 3B9-839-751-BG).

Wagon/Variant specific — the 3B9 prefix is reserved for Variant (Wagon/Estate) body styles. While the motor body and mounting are identical to the sedan equivalent (3B5839751BG), the internal comfort module software is mapped for the wagon's cabin volume, locking logic, and anti-pinch properties. Not interchangeable with sedan units.

Technical Specifications

• Component Type: Electric power window lift motor with integrated convenience gateway module
• Placement: Rear Left — Driver's door (LHD vehicles)
• Superseded By: 3B9839751CM, 3B9839751CK, 3B9839751CJ

Vehicle Fitment

• Volkswagen Passat Wagon / Variant / Estate (B5.5 / 3BG) — 2001–2005

Technical Notes

• Water Damage Risk: On B5/B5.5 Passats, aging door window scrapers and deteriorated inner door cards allow rainwater to drip directly onto the multi-pin connector of this motor, corroding the control pins and damaging the transceiver board.
• Convenience Module Domino Effect: All peripheral door electronics link back to the Central Convenience Module (CCM) under the driver's carpet. A short-circuit inside this motor's control board can corrupt the communication line, triggering symptoms like a dead puddle light, unresponsive fuel door switch, or a rear door that won't lock/unlock via the key fob.