61 35 080 Removing and installing (replacing) control unit for left or right seat adjustment (front seat)

Illustration of problem: (replacement only): 

In the event of a faulty seat module, new variants with a 30 mm wider housing will be used as replacements as of 03/2005.

• Seat module up to 03/2005 approx. 135 mm.
• Seat module from 03/2005 approx. 165 mm.

This results (on the right seat only) in a collision with the central seat connector.

In vehicles up to 03/2005 it is therefore necessary to fit the right seat with a new seat pan (applicable from 03/2005).

The following SM variants are affected:

• SM H.
• SM BA/M.
• SM BA/M-HK.

Necessary Preliminary Tasks: 

• Disconnect battery negative lead. Refer to 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD .
• Remove trims for top rail. Refer to 52 17 ... REMOVING AND INSTALLING/REPLACING ALL TRIMS ON LEFT OR RIGHT SEAT RAILS .

Removal and installation: 

Unlock and disconnect all plug connections in area (1).

Unlock catches (2) towards rear, feed out control unit for seat adjustment (3) in direction of arrow and remove from seat rail (4).

Fig 1: Locating Control Unit Plug Connections

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Make sure mounts (1) and retaining lugs (2) of control unit for seat adjustment (3) are correctly seated.

Fig 2: Identifying Mounts And Retaining Lugs Of Control Unit

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Replacement: 

Remove trim for top rail on outside. Refer to 52 17 ... REMOVING AND INSTALLING/REPLACING ALL TRIMS ON LEFT OR RIGHT SEAT RAILS .

Unlock central seat connector (1) and disconnect.

Unlock and disconnect all plug connections from connector strips (2).

Fig 3: View Of Central Seat Connector

Courtesy of BMW OF NORTH AMERICA, INC.

Pull seat pan (1) forwards slightly and unclip from seat linkage.

Lift seat pan at rear left and right out of seat rail.

Fig 4: Identifying Seat Pan In Seat Linkage

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Turn seat pan in seat mechanism and feed out towards front.

Unclip seat wiring harnesses from seat pan.

Remove seat pan.

Fig 5: Removing Seat Pan

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The new seat module is secured to the new seat pan in the area marked "R".

Wiring harness (1) must be relaid accordingly.

Pay attention to new clip positioning (2).

Fig 6: Identifying Wiring Harness And Clip In Seat Pan

Courtesy of BMW OF NORTH AMERICA, INC.

Carry out programming/coding. Refer to DIAGNOSIS PROGRAMMING/CODING .