Audi A4: Airbag Control Module

Overview - Airbag Control Module

1 - Center Tunnel

2 - Nut

• 9 Nm
• Quantity: 4
• The thread must be paint and contaminant free, nut and ground pins serve as ground connection for the control module.

3 - Airbag Control Module -J234-

• Removing and installing. Refer to → Chapter "Airbag Control Module -J234-, Removing and Installing".
• The control module is grounded via the housing with the body.

4 - Connectors

5 - Threaded Pins

• Quantity: 4
• The thread must be paint and contaminant free, nut and ground pins serve as ground connection for the control module.

Airbag Control Module -J234-, Removing and Installing

Special tools and workshop equipment required

• Vehicle Diagnostic Tester
• Pry Lever -80-200-
• Scissors

Removing

  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".

- Disconnect the battery ground cable with the ignition turned on. Refer to → Electrical Equipment; Rep. Gr.27; Battery; Battery, Disconnecting and Connecting.

- Remove the center console. Refer to → Chapter "Center Console, Removing and Installing".

- Remove the Access/Start System Antenna 1 in Vehicle Interior -R138-. Refer to → Electrical Equipment; Rep. Gr.94; Access/Start Authorization; Component Location Overview - Keyless Access Authorization System.

- Equipped on some models: Remove the rear air duct. Refer to → Heating, Ventilation and Air Conditioning; Rep. Gr.87; Air Routing; Overview - Air Routing and Air Distribution in Vehicle Interior.

- Cut through the carpet connecting piece -1- at the position shown in the illustration -arrow A- using scissors.

- Remove the nut -arrows B-.

- Unclip the control module cover -2- from the threaded pin.

- Unclip the wiring harness from the cover using the Pry Lever -80-200- and free it up.

- Pull the control module cover out from under the carpet and remove it.

- Remove the nuts -arrows-.

  WARNING

Risk of injury due to involuntary deployment.

Before handling pyrotechnic components (For example, disconnecting the connector), the person handling it must "discharge static electricity". For example, this can be done by briefly touching the door striker.

- Remove the airbag control module -2- from the threaded pin.

- Disconnect the connectors -1 and 3- by releasing the connector safety catch and opening the securing clip on the connector.

Installing

  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".
• Before handling pyrotechnic components (For example, connecting a connector), the person handling it must "discharge static electricity". For example, this can be done by briefly touching the door striker.

Install in reverse order of removal and note the following:

  Note

Make sure the connectors are pushed in all the way and that they engage audibly.

  WARNING

Repairing pyrotechnic components (For example the airbag and seat belt tensioner) incorrectly increases the risk of injuries due to unintentional deployments when the battery is connected.

• The ignition must be on when connecting the battery.
• There must not be anyone in the vehicle interior when connecting the battery.

- Connect the battery ground cable with the ignition switched on. Refer to → Electrical Equipment; Rep. Gr.27; Battery; Battery, Disconnecting and Connecting.

  WARNING

Risk of malfunction.

• After every removal and installation of the Airbag Control Module -J234-, the Guided Function "Inertial sensor basic setting" must be performed.
• If the Airbag Control Module -J234- is replaced with a new part, the basic setting is performed when implementing the "15 - Replace airbag control module" program.
• If the Airbag Control Module -J234- is removed and then the same one is reinstalled, perform the "inertial sensor basic setting" as follows:

- Connect the Vehicle Diagnostic Tester.

- Switch the ignition on.

- Select and start the Diagnostic operating mode.

- Select the Test plan tab.

- Select the Select individual test button and select the following tree structure consecutively:

• Body
• Body Assembly
• 01 - OBD-capable systems
• 15 - Airbag - Airbag Control Module -J234-
• 15 - Airbag, Functions
• 15 - Basic Setting
• 15 - Inertial Sensor Basic Setting

- Start the selected program and follow the instructions on the Vehicle Diagnostic Tester display.

  Note

If the Airbag Indicator Lamp -K75- indicates a fault after installing, check the DTC memory, erase it and check it again using the Vehicle Diagnostic Tester.

Installation instructions: tightening specifications, replacing body parts. Refer to → Chapter "Overview - Airbag Control Module" and → Chapter "Overview - Center Console, Storage Compartment".

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