Actuating unit version (C) (spare part):

WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 2006 BMW 330Ci, 2005 BMW 330xi, 2005 BMW 330i, 2005 BMW 330Ci, and 2004 BMW 330xi. However, it is still accessible from the selected car via links, so may be relevant.

The two adjusting screws for the eccentric disk have conventional Phillips heads.

The adjusting screws (1) and (2) can be adjusted in the workshop.
The actuating unit may be fitted to either front seat.
Prior to installation, apply an acid-free grease to thread; the grease forces the eccentric disk upwards during adjustment

Fig 1: Identifying Actuating Unit Version (C) (Spare Part) For Front Seat
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Removing and installing actuating unit:

Remove front seat, refer to REMOVING AND INSTALLING LEFT OR RIGHT FRONT SEAT (NORMAL/MANUAL) .

Remove outer cover on front seat, refer to REMOVING AND INSTALLING / REPLACING OUTER COVER ON LEFT OR RIGHT FRONT SEAT BACK-REST (NORMAL / MANUAL) .

Move front seat to basic position:

CAUTION: One seat runner is spring-loaded, risk of injury when unlocking.

Operate actuating lever (1) and snap seat runners (2) into position by sliding.

Operate actuating lever (3) and snap seat cushion (4) into position by loading.

Operate actuating lever (5) and snap seat backrest (6) into position by moving.

Fig 2: Moving Front Seat

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Lever out rear trim (1), unclip clips (2) and remove trim (1).

Fig 3: Removing Rear Trim

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Installation:

Catch (1) and clips (2) on trim (3) must not be damaged; replace if necessary.

Fig 4: Identifying Catch & Clips On Trim
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Version with seat heater and/or lumbar support: Slide cable (1) out of fixture (2) of actuating unit (3).

Fig 5: Sliding Cable Out Of Fixture Of Actuating Unit (Version With Seat Heater &/Or Lumbar Support)

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Version with seat heater and/or lumbar support:

Slide cable (1) out of fixture (2) of actuating unit (3).

Fig 6: Sliding Cable Out Of Fixture Of Actuating Unit (Version With Seat Heater &/Or Lumbar Support)

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Model with lumbar supports:

If necessary, slide cable (1) out of fixture (2) of actuating unit (3).

If necessary, disconnect switch (4).

Fig 7: Identifying Cable, Fixture, Actuating Unit & Switch

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Release expansion rivet (1) and detach rocker (2) (adjustment lever) from lever (3).

CAUTION: Do not turn adjustment lever (2) on threaded rod (2).

Fig 8: Releasing Expansion Rivet & Detaching Rocker (Adjustment Lever) From Lever

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Lift actuating lever (1) and release screw (2).

Release screws (3) and (4) and detach actuating unit (5).

Installation:

Screw (3) is shorter than the others.
Insert screw (3) for assembly into actuating unit (5).
Tightening torque, refer to SEATS - TIGHTENING TORQUES - 3-SERIES .

Fig 9: Detaching Actuating Unit
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Installation:

Front guide (1) and eccentric disks (2) on actuating unit (3) must not be damaged.

Fig 10: Identifying Front Guide & Eccentric Disks On Actuating Unit
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Replacement of actuating unit version (C) (spare part) only:

Installation:

For adjustment, coat threads (1) with acid-free grease.
The eccentric disks (2) and (4) are carried upwards for adjustment by the grease.

Threads for eccentric disks
Eccentric disk for backrest adjustment
Actuating lever for backrest adjustment
Eccentric disk for seat height adjustment
Actuating lever for seat height adjustment

Fig 11: Identifying Components Of Actuating Unit Version (C) (Spare Part) Only For Front Seat
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Adjusting actuating unit, actuating unit version (C) (spare part) only:

Adjusting seat height and backrest inclination:

The screw heads of threads (2) must remain clipped in place
Unscrew eccentric disk (1)
Apply acid-free grease to threads (2)
Screw on eccentric disk (1)
Turn eccentric disk (1) to zero position: straight surface (3) of eccentric disk (1) must be at top.

Fig 12: Adjusting Actuating Unit, Actuating Unit Version (C) (Spare Part) Only For Front Seat
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NOTE: The picture does not match the replacement unit, the replacement unit has Phillips screws.

Install actuating unit.
Press screws (1) and (2) out of hexagon head to seat center and screw down.

Tightening torque, refer to SEATS - TIGHTENING TORQUES - 3-SERIES .

Fig 13: Installing Actuating Unit

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Adjust longitudinal seat setting:

Compress unlocking plates (1) and (2) on seat runner on left/right with gripping pliers (3) (free of play)

Fig 14: Compressing Unlocking Plates On Seat Runner On Left/Right With Gripping Pliers (Free Of Play)
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Adjust longitudinal seat setting:

Push new coupling link (1) (adjustment lever) onto threaded rod (3) and secure with expansion rivet (2)

Fig 15: Pushing Coupling Link (Adjustment Lever) Onto Threaded Rod & Securing With Expansion Rivet
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Adjust longitudinal seat setting:

Press actuating lever (1) for longitudinal seat adjustment downwards and press together locking clip (3) on coupling link (4)
(coupling link (4) is now firmly connected to threaded rod (2))
Install front seat in the car. See 52 13 000 Removing and installing left or right front seat (normal/manual)
If necessary, release expansion rivet (5) and readjust by turning coupling link (4)

Fig 16: Adjusting Longitudinal Seat Setting
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Move front seat to basic position:

Operate actuating lever (1) and snap seat runners (2) into position by sliding.
Operate actuating lever (3) and snap seat cushion (4) into position by loading.
Operate actuating lever (5) and snap seat backrest (6) into position by moving.
Each actuating lever must have clearance until the mechanism is unlocked
If there is no clearance, the mechanism may be in a semi-unlocked state (risk of injury in event of an accident)
If there is excessive clearance, the mechanism may not unlock completely (no adjustment possible)

Fig 17: Moving Front Seat
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Carrying out checks of seat height and backrest inclination adjustment (danger to life of vehicle occupants):

Check backrest inclination:

Front seat must be in basic position
Actuating lever (1) must be in zero position
Pin (2) must rest against pull rod (3)
There must be a clearance (A)

(A) 0 to 0.5 mm

Fig 18: Checking Backrest Inclination

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Check seat height:

Front seat must be in basic position
Actuating lever (1) must be in zero position Metal lever (2) must rest against metal lever (3)
There must be a clearance (A)

(A) 0 to 0.5 mm

Fig 19: Checking Seat Height

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