Special tools required:
WARNING: This page is about a different car, the 2005 BMW 745i, 2004 BMW 745i, 2003 BMW 745i, and 2002 BMW 745i. However, it is still accessible from the selected car via links, so may be relevant.
- 52 0 050
Necessary preliminary tasks:
- Remove rear panel on front seat backrest, refer to 52 14 198 REMOVING AND INSTALLING / REPLACING REAR PANEL ON LEFT OR RIGHT FRONT SEAT BACKREST (NORMAL / ELECTRIC) and 52 17 205 REMOVING AND INSTALLING/REPLACING BOTH REAR PANELS ON LEFT OR RIGHT FRONT SEAT BACKREST (COMFORT)
Detach backrest cover (1) at bottom from backrest frame.
Remove valve housing. Refer to 52 14 060 REMOVING AND INSTALLING/REPLACING VALVE HOUSING FOR LEFT OR RIGHT FRONT LUMBAR SUPPORT (NORMAL/ELECTRIC) and 52 17 060 REMOVING AND INSTALLING/REPLACING VALVE HOUSING FOR LUMBAR CUSHION (COMFORT) .
Disconnect air hoses (2) from valve housing.
NOTE:
Heat air hoses gently if they are firmly seated on valve housing.
Housing of valve block must not be unclipped (leakage). If necessary, release mounting and clip housing together.
Housing of valve block must not be unclipped (leakage). If necessary, release mounting and clip housing together.
If necessary, cut all retainers on lumbar cushion (3) and spring wire.
NOTE:
Remove all remnants of retainers. Lock new retainers by bending with special tool 52 0 050.
Detach lumbar cushion (3) from spring wire.
Remove lumbar cushion (3) downwards between backrest frame and seat mechanism.
Installation:
Make sure air hoses are correctly connected to valve block (color coding).
Air hoses must be laid without kinks.
Check lumbar cushion for damage.