Upper Seat Pan Frame
Upper Seat Pan Frame
• The following describes removing and installing a lower seat frame without a seat depth adjuster. Removing and installing a lower seat frame with a seat depth adjuster is identical.
Removing
• Follow all safety precautions when working on pyrotechnic components. Refer to => [ Restraint System Components, Safety Precautions and Testing Procedures ] Description and Operation.
• Before handling pyrotechnical components (for example, disconnecting the connector), the person handling them must "discharge static electricity". For example, by briefly touching the door striker pin.
Adjust the front seat so that it is in the highest position. This reduces the spring force when removing and installing the torsion bar and the risk of damaging the threaded connections between upper/lower frames of the seat pan.
- Remove the front seat. Refer to => [ Power Standard Seat/Sport Seat/Super Sport Seat ] Power Standard Seat/Sport Seat/Super Sport Seat.
- Remove the backrest. Refer to => [ Backrest ] Backrest.
- Remove seat cover with seat cushion. Refer to => [ Seat Cover with Seat Cushion - Standard Seat ] Seat Cover With Seat Cushion - Standard Seat.
- Disconnect the electrical connector on the seat forward/back adjustment motor.
- Unclip modular wire routing bracket on the seat pan lower frame.
- Remove seat position sensor from the lower frame. Refer to => [ Driver and Front Passenger Seat Position Sensor G553/G554, Vehicles with Seat Occupied Sensor for Belt Fastening Detection ] Driver and Front Passenger Seat Position Sensor G553/G554, Vehicles With Seat Occupied Sensor For Belt Fastening Detection.
- Disconnect the connector from the front seat belt latch. Refer to => [ Disconnect the connector and free up the electric wire. ] Front Belt Latch With Belt Switch E24/E25.
- Unclip the electrical wire from the seat pan lower frame and set aside.
- Remove the screw - 3 -.
Danger of damaging the threaded holes or the bushing in the bearing points (connecting upper/ lower frame).
• A second technician is needed to push on the seat via the backrest while removing the following screws.
- Remove the bolts - 2 - and then remove the upper frame - 1 - from the lower frame - 4 -.
Risk of damage to the bushings - 1 - in the bearing points - 2 - (upper/lower threaded connection).
• The bushings cannot be replaced with workshop materials.
• If the bushings are damaged, the corresponding assembly parts must be replaced.
- Remove the memory seat/steering column adjustment control module (J136) / (J521). Refer to => [ Memory Seat/Steering Column Adjustment Control Module Bracket J136/J521 ] Memory Seat/Steering Column Adjustment Control Module Bracket J136/J521.
- Vehicles with seat depth adjuster: remove the seat depth adjuster. Refer to => [ Depth Adjustment Motor V256/V257 ] Depth Adjustment Motor V256/V257.
- Vehicles with seat ventilation: remove the fan for the seat cushion. Refer to => [ Seat Cushion Fans V390/V391/V419/V420 ] Seat Cushion Fans V390/V391/V419/V420.
- Remove seat height adjustment motor (V245) / (V246). Refer to => [ Seat Height Adjustment Motor V245/V246 ] Seat Height Adjustment Motor V245/V246.
- Remove seat angle adjustment motor (V243) / (V244). Refer to => [ Seat Angle Adjustment Motor V243/V244 ] Seat Angle Adjustment Motor V243/V244.
- Remove wiring harnesses and individual wires from seat pan upper frame.
Installation
• Follow all safety precautions when working on pyrotechnic components. Refer to => [ Restraint System Components, Safety Precautions and Testing Procedures ] Description and Operation.
• Before handling pyrotechnical components (for example, connecting electrical connector), the person handling them must "discharge static electricity". For example, by briefly touching the door striker pin.
• Observe all measures when installing the front seat => [ Power Standard Seat/Sport Seat/Super Sport Seat ] Power Standard Seat/Sport Seat/Super Sport Seat.
Install in reverse order of removal. Note the following:
Information for installation: for example tightening specifications, replacing body parts, refer to => [ Seat Frame Assembly Overview ] Seat Frame Assembly Overview, => [ Seat Height Adjustment Motor Assembly Overview ] Seat Height Adjustment Motor Assembly Overview.