Audi A4: Front Seats

Component Location Overview - Electric and Electronic Components

1 - Memory Seat/Steering Column Adjustment Control Module

• Memory Seat/Steering Column Adjustment Control Module -J136-
• Front Passenger Memory Seat Control Module -J521-

• Equipped on some models: Integrated seat ventilation and seat heating function
• Removing and installing. Refer to → Chapter "Seat Functions Control Module, Removing and Installing".

2 - Seat Position Sensor

• Driver Seat Position Sensor -G553-
• Front Passenger Seat Position Sensor -G554-

• Overview. Refer to → Chapter "Overview - Seat Position Sensor".

3 - Front Passenger Occupant Detection Sensor -G128-

• For the front passenger seat only
• Removing and installing. Refer to → Chapter "Front Passenger Occupant Detection Sensor -G128-, Removing and Installing".

4 - Seat Forward/Back Adjustment Motor

• Driver Seat Forward/Back Adjustment Motor -V28-
• Front Passenger Seat Forward/Back Adjustment Motor -V31-

• Integrated in the seat pan; Replace if the seat pan is faulty. Refer to → Chapter "Seat Forward/Back Adjuster, Removing and Installing, Seat Forward/Back Adjustment Motor"

5 - Seat Belt Switch

• Driver Seat Belt Switch -E24-
• Front Passenger Seat Belt Switch -E25-

• Removing and installing. Refer to → Chapter "Front Seat Belt Latch, Removing and Installing".

6 - Backrest Adjustment Motor

• Driver Backrest Adjustment Motor -V45-
• Front Passenger Backrest Adjustment Motor -V46-

• Overview. Refer to → Chapter "Overview - Front Backrest, Backrest Adjustment Motor".

7 - Lumbar Support

• Driver Seat Lumbar Support Curvature Adjustment Motor -V125-
• Driver Seat Lumbar Support Height Adjustment Motor -V129-
• Front Passenger Seat Lumbar Support Curvature Adjustment Motor -V126-
• Front Passenger Seat Lumbar Support Height Adjustment Motor -V130-

• Removing and installing. Refer to → Chapter "Lumbar Support Adjustment Motors -V125-/-V126-/-V129-/-V130-, Removing and Installing".

8 - Backrest fan

• Driver Seat Backrest Blower Fan -V388-
• Front Passenger Seat Backrest Blower Fan -V389-

• Removing and installing. Refer to → Chapter "Backrest Fan, Removing and Installing".

9 - Front Thorax Airbag

• With

• Driver Thorax Airbag Igniter -N199-
• Front Passenger Thorax Airbag Igniter -N200-

  WARNING

Risk of injury due to involuntary deployment.

Pay attention to the safety precautions when working with pyrotechnic components. Refer to → Chapter "Safety Precautions when Working with Pyrotechnic Components".

• Overview. Refer to → Chapter "Overview - Front Thorax Airbag".

10 - Rear Footwell Lamp

• Left Rear Footwell Lamp -W45-
• Right Rear Footwell Lamp -W46-

• Removing and installing. Refer to → Electrical Equipment; Rep. Gr.96; Lamps; Rear Footwell Lamps W45/W46 Removing and Installing.

11 - Seat Cushion Fan

• Driver Seat Cushion Blower Fan -V390-

Overview - Front Seat

1 - Connector Station

• Connector assignment. Refer to → Wiring diagrams, Troubleshooting & Component locations.

2 - Seat Trim in Front

• Overview. Refer to → Chapter "Overview - Seat Pan, Trim Panels".

3 - Seat Pan

• Overview. Refer to → Chapter "Overview - Seat Pan".

4 - Front Cover

• For the seat rail
• Removing and installing. Refer to → Chapter "Front and Rear Seat Rail Cover, Removing and Installing".

5 - Bolt

• 50 Nm
• Quantity: 4
• Front seat, removing and installing. Refer to → Chapter "Front Seat, Removing and Installing".

6 - Child Seat Anchor

• For the front passenger seat only
• Overview. Refer to → Chapter "Overview - Front Child Seat Anchors".

7 - Front Seat Belt Latch

• Overview. Refer to → Chapter "Overview - Front Seat Belt Latch".

8 - Tunnel Side Seat Side Trim

• Overview. Refer to → Chapter "Overview - Seat Pan, Trim Panels".

9 - Backrest

• Overview. Refer to → Chapter "Overview - Front Backrest".

10 - Headrest

• Overview. Refer to → Chapter "Overview - Headrest".

11 - Backrest Cover

• Overview. Refer to → Chapter "Overview - Front Backrest".

12 - Seat Side Trim on Side Sill

• Overview. Refer to → Chapter "Overview - Seat Pan, Trim Panels".

13 - Rear Cover

• For the seat rail
• Removing and installing. Refer to → Chapter "Front and Rear Seat Rail Cover, Removing and Installing".

14 - Seat Adjustment Control Head

• Overview. Refer to → Chapter "Overview - Seat Pan, Power Seat Adjustment Actuator/Switch".

15 - Lumbar Support Adjustment Switch

• Overview. Refer to → Chapter "Overview - Seat Pan, Power Seat Adjustment Actuator/Switch".

16 - Connector

• With a corrugated tube for the modular wiring routing
• Modular wiring routing, disconnecting and connecting. Refer to → Chapter "Modular Wiring Routing, Disconnecting and Connecting".

17 - Cover

• For the connector station

Overview - Front Backrest

Overview - Front Backrest, Lumbar Support

1 - Electro-Mechanical Lumbar Support

• Manufactured by Brose
• Removing and installing. Refer to → Chapter "Lumbar Support Adjustment Motors -V125-/-V126-/-V129-/-V130-, Removing and Installing".

2 - Electro-Mechanical Lumbar Support

• Manufactured by Schukra
• Removing and installing. Refer to → Chapter "Lumbar Support Adjustment Motors -V125-/-V126-/-V129-/-V130-, Removing and Installing".

3 - Fixed Lumbar Support

• No motors
• Equipped on some models: Power backrest adjustment without lumbar support
• Removing and installing. Refer to → Chapter "Lumbar Support Adjustment Motors -V125-/-V126-/-V129-/-V130-, Removing and Installing".

4 - Tension Springs

• For spring mat
• Note the different lengths

5 - Spring Mat

• Equipped on some models: Manual backrest adjustment without lumbar support
• Removing and installing. Refer to → Chapter "Spring Mat, Removing and Installing".

6 - Backrest

• Removing and installing. Refer to → Chapter "Front Backrest, Removing and Installing".

7 - Backrest Cover

• Removing and installing. Refer to → Chapter "Backrest Cover, Removing and Installing".
• Make sure it is engaged properly after installing

8 - Tension Springs

• For spring mat
• Note the different lengths

9 - Bolt

• 33 Nm
• Replace after removing
• Quantity: 4
• Self-locking
• Threaded holes for the bolts must be cleaned with a thread tap, For example

10 - Rivet

Overview - Front Backrest, Backrest Adjustment Motor

1 - Adjustment Shaft

2 - Bolt

• 7.5 Nm

3 - Backrest Adjustment Motor

• Removing and installing. Refer to → Chapter "Driver and Front Passenger Backrest Adjustment Motor -V45-/-V46-, Removing and Installing".

4 - Connector

5 - Backrest Frame

6 - Lock Washer

• Replace after removing
• Push onto the adjustment shaft so that there is still at least 1.0 mm of play

Overview - Headrest

1 - Bolt

• 2.8 Nm
• Quantity: 2

2 - Left Headrest Guide

• With headrest release ring
• Removing and installing. Refer to → Chapter "Headrest Guide, Removing and Installing".
• Press until all three retainers are completely locked into the backrest frame

3 - Right Headrest Guide

• Removing and installing. Refer to → Chapter "Headrest Guide, Removing and Installing".
• Press until all three retainers are completely locked into the backrest frame

4 - Cover

• For headrest
• Removing and installing. Refer to → Chapter "Headrest Guide, Removing and Installing".

5 - Bolt

• 2.8 Nm

6 - Headrest

• With height and angle adjustment
• Cannot be disassembled
• Removing and installing. Refer to → Chapter "Headrest, Removing and Installing".
• Must be correctly locked in the headrest guides

7 - Headrest

• With height and depth adjustment
• Cannot be disassembled
• Removing and installing. Refer to → Chapter "Headrest, Removing and Installing".
• Must be correctly locked in the headrest guides

8 - Trim

• For headrest
• Removing and installing. Refer to → Chapter "Headrest, Removing and Installing".

9 - Clips

10 - Backrest Frame

Overview - Seat Pan

Overview - Seat Pan, Trim Panels

1 - Seat Side Trim on Side Sill

• For manual seat
• Removing and installing. Refer to → Chapter "Seat Side Trim on Side Sill Side, Removing and Installing".
• Press on until it clicks into place on the bracket and on the front seat trim

2 - Bolt

• 3.5 Nm
• Quantity: 2

3 - Adapter

• For the manual seat height adjustment lever

4 - Front Cover

• For the seat rail
• Quantity: 2
• Removing and installing. Refer to → Chapter "Front and Rear Seat Rail Cover, Removing and Installing".
• Slide on carefully until it clicks into place

5 - Seat Trim in Front

• For versions with seat depth adjuster
• Removing and installing. Refer to → Chapter "Front Seat Trim, Removing and Installing".
• Press on until it engages audibly

6 - Expanding Clip

7 - Tunnel Side Seat Side Trim

• Removing and installing. Refer to → Chapter "Seat Side Trim on Tunnel Side, Removing and Installing".

8 - Rear Cover

• For the seat rail
• Quantity: 2
• Removing and installing. Refer to → Chapter "Front and Rear Seat Rail Cover, Removing and Installing".
• Slide on carefully until it clicks into place

9 - Expanding Clip

10 - Center Cover

• For the seat rail
• Removing and installing. Refer to → Chapter "Center Seat Rail Cover, Removing and Installing".

11 - Expanding Clip

12 - Seat Side Trim on Side Sill

• For the power seat
• Removing and installing. Refer to → Chapter "Seat Side Trim on Side Sill Side, Removing and Installing".
• Press on until it clicks into place on the bracket and on the front seat trim

13 - Hand Wheel

• For manual backrest adjustment
• Removing and installing. Refer to → Chapter "Backrest Adjustment Hand Wheel, Removing and Installing".
• Press on until it engages audibly.

14 - Expanding Clip

15 - Lever

• For manual seat height adjustment
• Removing and installing. Refer to → Chapter "Seat Height Adjuster, Removing and Installing, Seat Height Adjustment Handle".
• Before pressing on, check if the spring in inserted in the shaft for seat height adjustment

16 - Spring

• For the manual seat height adjustment lever

Overview - Seat Pan, Seat without Seat Depth Adjuster

1 - Handle

• For manual seat forward/back adjustment
• Replace after removing
• Removing and installing. Refer to → Chapter "Seat Forward/Back Adjuster, Removing and Installing, Seat Forward/Back Adjustment Handle".

2 - Release Cable

• For manual seat forward/back adjustment
• Unit with lever
• Removing and installing. Refer to → Chapter "Seat Forward/Back Adjuster, Removing and Installing, Seat Forward/Back Adjuster Release Cable".

3 - Seat Pan

• Upper and lower frame cannot be separated
• To replace, install the electrical and electronic components and wires in the new seat pan

4 - Bolt

• 3.5 Nm
• Quantity: 2

5 - Spring Nut

• Quantity: 2
• Attached in the seat pan
• Replace any damaged or deformed spring nuts

6 - Bolt

• Quantity: 2
• Tightening specification -Item 4-

7 - Child Seat Anchor

• Front passenger seat only
• Bolted to the seat pan
• Check after an accident. Refer to → Chapter "Child Seat Anchors, Checking After Collision".
• Replace damaged or deformed child seat anchor
• Overview. Refer to → Chapter "Overview - Front Child Seat Anchors".

8 - Expanding Clip

9 - Bracket

• For seat side trim on side sill side
• Removing and installing. Refer to → Chapter "Seat Side Trim on Side Sill Side, Removing and Installing".

10 - Bolt

• 7.5 Nm
• Quantity: 2

Overview - Seat Pan, Seat with Seat Depth Adjuster

1 - Seat Pan

2 - Nut

• 6.5 Nm
• Quantity: 2

3 - Nut

• 6.5 Nm
• Quantity: 2

4 - Seat Depth Adjuster

• Removing and installing. Refer to → Chapter "Seat Depth Adjuster, Removing and Installing".

5 - Sleeve

• Quantity: 2

6 - Bolt

• Quantity: 2

7 - Bolt

• Quantity: 2

8 - Spring Nut

• Quantity: 2
• Attached in the seat pan
• Replace any damaged or deformed spring nuts

9 - Bolt

• Quantity: 2
• Tightening specification -Item 4-

10 - Child Seat Anchor

• Front passenger seat only
• Bolted to the seat pan
• Check after an accident. Refer to → Chapter "Child Seat Anchors, Checking After Collision".
• Replace damaged or deformed child seat anchor
• Overview. Refer to → Chapter "Overview - Front Child Seat Anchors".

11 - Expanding Clip

12 - Bracket

• For seat side trim on side sill side
• Removing and installing. Refer to → Chapter "Seat Side Trim on Side Sill Side, Removing and Installing".

13 - Bolt

• 7.5 Nm
• Quantity: 2

Overview - Seat Pan, Fire Extinguisher

1 - Fire Extinguisher

2 - Bolt

• 7.5 Nm
• Quantity: 2

3 - Fire Extinguisher Mount

4 - Bracket

5 - Bolt

• 7.5 Nm
• Quantity: 4

6 - Spring Nut

• Quantity: 4
• Attached in the seat pan
• Replace any damaged or deformed spring nuts

Overview - Seat Pan, Power Seat Forward/Back Adjustment

1 - Bolts

• 22 Nm
• Replace after removing
• Self-locking
• Clean the threaded hole for the bolt with For example a thread tap.

2 - Seat Pan Lower Frame

• With forward/back adjustment motor
• Removing and installing. Refer to → Chapter "Seat Forward/Back Adjuster, Removing and Installing, Seat Forward/Back Adjustment Motor".

3 - Thrust Washers

• No longer installed after removing

4 - Seat Pan Upper Frame

• Install all electrical and electronic components and wires in the new upper frame.
• Removing and installing. Refer to → Chapter "Seat Forward/Back Adjuster, Removing and Installing, Seat Forward/Back Adjustment Motor".

5 - Bushing

6 - Bolts

• 22 Nm
• Replace after removing
• Self-locking
• Clean the threaded hole for the bolt with For example a thread tap.

7 - Thrust Washers

• No longer installed after removing

Overview - Seat Pan, Seat Height Adjustment

1 - Bolt

• 5 Nm
• Quantity: 3

2 - Height Adjustment Motor

• Power front seat
• Removing and installing. Refer to → Chapter "Seat Height Adjuster, Removing and Installing, Seat Height Adjustment Motor".

3 - Seat Pan

Overview - Seat Pan, Seat Angle Adjuster

1 - Bolt

• 10 Nm
• Replace after removing
• Quantity: 2
• Self-locking
• Threaded holes for the bolts must be cleaned with a thread tap, for example

2 - Angle Adjustment Motor

• Removing and installing. Refer to → Chapter "Seat Angle Adjuster, Removing and Installing".

3 - Bolt

• 20 Nm
• Replace after removing
• Self-locking
• Clean the threaded hole for the bolt with for example a thread tap.

4 - Adjustment Shaft

Overview - Seat Pan, Power Seat Adjustment Actuator/Switch

1 - Seat Side Trim on Side Sill

• Removing and installing. Refer to → Chapter "Seat Side Trim on Side Sill Side, Removing and Installing".

2 - Lumbar Support Adjustment Switch

• Removing and installing. Refer to → Chapter "Driver and Front Passenger Seat Lumbar Support Adjustment Switch -E176-/-E177-, Removing and Installing".

3 - Bolt

• 0.4 Nm
• Quantity: 2

4 - Seat Adjustment Control Head

• Removing and installing. Refer to → Chapter "Driver/Front Passenger Seat Adjustment Control Head -E470-/-E471-, Removing and Installing".

5 - Bolt

• 0.4 Nm
• Quantity: 3

6 - Expanding Clip

7 - Actuator

• For seat and backrest adjuster
• Clipped on
• Removing and installing. Refer to → Chapter "Driver/Front Passenger Seat Adjustment Control Head -E470-/-E471-, Removing and Installing".
• Press on until it engages audibly.

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