52 13 015 Removing and installing / replacing controls on left / right front seat (normal / manual)

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WARNING: The actuating unit for front seats which was fitted during car production is different from the spare part.

Actuating unit version (A):

The two adjusting screws (1) and (2) for eccentric disks, have a commercially available Torx screw head which is sealed with hot-melt adhesive.

The adjusting screws (1) and (2) must not be adjusted in the workshop.
The actuating unit may only be removed from and refitted to the same front seat.

Fig 1: Adjusting Screws And Eccentric Disks (Actuating Unit Version A)

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Actuating unit version (B):

The two adjusting screws (1) and (2) for eccentric disks, are secured with tamper protection in the screw head.

The adjusting screws (1) and (2) must not be adjusted in the workshop.
The actuating unit may only be removed from and refitted to the same front seat.

Fig 2: Adjusting Screws And Eccentric Disks (Actuating Unit Version B)

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Actuating unit version (C) (spare part):

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 3: Adjusting Screws And Eccentric Disks (Actuating Unit Version C

Courtesy of BMW OF NORTH AMERICA, INC.

Removing and installing actuating unit:

Remove front seat,

refer to .

Remove outer cover on front seat,

refer to 52 13 040 .

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 4: Removing Actuating Lever And Snap Seat Backrest

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

Fig 5: Removing Trim

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Installation:

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

Fig 6: Catch, Clips And 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 7: Slide Cable And Actuating Unit

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Version with seat heater and/or lumbar support:

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

Fig 8: Slide Cable And Fixture

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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 9: Slide Cable And Actuating Unit

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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 10: Releasing Expansion Rivet

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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: 52 10 7AZ, see 52 10 FRONT SEATS .

Fig 11: Lifting Actuating Lever

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Installation:

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

Fig 12: Eccentric Disks And Actuating Unit

Courtesy of BMW OF NORTH AMERICA, INC.

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.

Fig 13: Coat Threads And Eccentric Disks

Courtesy of BMW OF NORTH AMERICA, INC.

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

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 14: Actuating Unit And Eccentric Disk

Courtesy of BMW OF NORTH AMERICA, INC.

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: 51 12 8AZ, see 51 12 REAR BUMPER .

Fig 15: Adjusting Screws And Eccentric Disks (Actuating Unit Version B)

Courtesy of BMW OF NORTH AMERICA, INC.

Adjust longitudinal seat setting:

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

Fig 16: Unlocking Plates And Pliers

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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 17: Coupling Link And 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.
If necessary, release expansion rivet (5) and readjust by turning coupling link (4)

Fig 18: Pressing Actuating Lever

Courtesy of BMW OF NORTH AMERICA, INC.

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 19: Removing Actuating Lever And Snap Seat Backrest

Courtesy of BMW OF NORTH AMERICA, INC.

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 20: Actuating Lever And Pin

Courtesy of BMW OF NORTH AMERICA, INC.

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 21: Actuating Lever And Metal Lever

Courtesy of BMW OF NORTH AMERICA, INC.