52 25 041 Removing and installing/replacing backrest frame on left or right rear seat

Necessary preliminary tasks: 

• Remove LEFT OR RIGHT REAR SEAT 

Unlock and disconnect plug connection (1) on drive unit for seat cushion tilt adjustment.

Lever out clips.

Feed out wiring harness.

Fig 1: Locating Wiring Harness Clips

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Unlock and disconnect plug connection (1) on drive unit for forward/back seat adjustment.

Fig 2: Identifying Plug Connection

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Release screws (1) on left and right.

Remove backrest frame.

Installation note: 

Replace micro-encapsulated screws (1).

Tightening torque: see 8AZ in 52 25 REAR SEAT, ELECTRIC

Fig 3: Identifying Micro-Encapsulated Screws

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Replacement only:

• Remove BACKREST COVER  for rear seat
• Remove CONTROL UNIT
• Remove LUMBAR SUPPORT 
• Remove MASSAGE MAT 
• Remove PUMP  for lumbar and massage
• Remove valve blocks for lumbar and massage. See VALVE BLOCK FOR LUMBAR SUPPORT  and MASSAGE VALVE BLOCK .
• Remove FOUR-BAR LEVER  on rear seat backrest.

Removing wiring harness: 

Unlock plug connections (1) and disconnect.

Feed wiring harness out of backrest frame.

Fig 4: Identifying Plug Connections

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Unfasten plug connection (1) and disconnect.

Remove connector housing (2).

Lever out all clips and remove wiring harness.

Fig 5: Locating Wiring Harness Clips

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