67 31 501 Removing And Installing/Replacing Forward/Back Seat Adjustment Drive Unit

WARNING: This page is about a different car, the 2010 BMW 135i, 2009 BMW 135i, and 2008 BMW 135i. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks

Remove FRONT SEAT. See SEAT SYSTEM - REPAIR (E82) or SEAT SYSTEM - REPAIR (E88) .

Unfasten plug connection (1) and disconnect.

Fig 1: Identifying Connectors And Expanding Rivets

Courtesy of BMW OF NORTH AMERICA, INC.

Press out pins of expanding rivets (2) and lever out expanding rivets. Carefully bend long flex shaft with jacket tube and pull out of gearing. Pull drive with short flex shaft out of gearing.

Installation:

Slide seat rail with opening forwards or back until bushing for flex shaft mounting of worm gear is flush. Insert flex shaft.

Fig 2: Sliding Seat Rail Forward/Backward

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Slide short flex shaft (1) into longitudinal seat adjustment gearing square. Bend long flex shaft (2) upwards and slide into longitudinal seat adjustment gearing. Make sure flex shafts are correctly seated in transmissions.

Fig 3: Identifying Short Flex Shaft And Long Flex Shaft

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

PTFE hoses (1) are shrink-fitted onto end pieces. Check that hoses are free from damage.

Fig 4: Identifying PTFE Hoses

Courtesy of BMW OF NORTH AMERICA, INC.