Backrest without active head restraint system, removing and installing four-way lumbar support

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2008 Audi S4, 2008 Audi RS 4, 2008 Audi A4, 2007 Audi S4, and 2007 Audi RS 4. However, it is still accessible from the selected car via links, so may be relevant.

Special tools, testers and auxiliary items required

Fig 1: Special Pop Rivet Pliers V.A.G 1753A

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Special pop rivet pliers V.A.G 1753A

Removing

CAUTION: Observe safety precautions for work on airbags → Airbag safety precautions .

Remove front seat → Seat, removing and installing .
Remove the seat backrest panel → Backrest cover, removing and installing

Fig 2: Backrest Without Active Head Restraint System - Four-Way Lumbar Support Remove/Install Components

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Pry fastening strips - 6 - (Qty. 4) out with a screwdriver.
Insert foil between upholstery and backrest frame to protect against metal particles.
Drill out rivet - 5 -.
Disconnect electrical connectors at lumbar support curvature and height adjustment motors - 4 - and - 7 -.

Fig 3: Disengaging Four-Way Lumbar Support With Springs At Backrest Frame

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disengage four-way lumbar support - 3 - with springs - 2 - (Qty. 2) at backrest frame - 3 -.

Fig 4: Backrest Without Active Head Restraint System - Four-Way Lumbar Support Remove/Install Components

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect Velcro connector between lumbar support - 2 - and backrest padding - 1 -.
Disengage lumbar support - 2 - at top of support frame - 3 -.
Remove lumbar support frame - 3 - with lumbar support - 2 -.

Installing

CAUTION: Observe safety precautions for work on airbags → Airbag safety precautions .

Fig 5: Laying Plastic Film Over Velcro Strips On Lumbar Support

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Lay plastic film - 1 - over Velcro strips - 4 - on lumbar support. Secure plastic film on lumbar support.
Ensure lumbar support is attached to lumbar support frame with assembly fastener - 5 - or a suitable screw.
Position four-way lumbar support frame behind backrest frame and engage top of frame - 3 - in mounts on backrest frame at left and right with springs - 2 -.

Fig 6: Four-Way Lumbar Support With Backrest Frame, Riveting

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Before securing rivet - 4 -, a plastic washer - 1 - must be placed between lumbar support - 2 - and backrest frame - 3 -.
Rivet lumbar support frame - 2 - with backrest frame - 3 -.
Remove plastic film between backrest padding and lumbar support.
Press lumbar support Velcro fastener onto backrest padding to secure.

Connect electrical connectors at curvature and height adjustment motors.

Further installation is performed in the reverse order of removal. Observe the following when doing so:

CAUTION: Before handling airbag units (e.g. disconnecting electrical connector), the person handling it must "electrostatically discharge". This can be done by touching door striker, for example.

NOTE:

Ensure that electrical connections are pushed in as far as stop and engage with a click.

Switch on ignition.

CAUTION: Ignition must be on when connecting battery. If pyrotechnic components (e.g. airbag, belt tensioner) are not repaired correctly, they may deploy unintentionally after connecting battery. There must not be anyone inside the vehicle when connecting the battery.

Connect battery with ignition on, procedure →
- 27 BATTERY, STARTER, GENERATOR, CRUISE CONTROL
- 27 - BATTERY, STARTER, GENERATOR, CRUISE CONTROL for ELECTRICAL EQUIPMENT - GENERAL INFORMATION
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If Airbag Malfunction Indicator Lamp (MIL) K75 indicates a fault after installation, DTC memory must be checked, deleted and checked again.