Removal and Replacement

Special Tools:

Special Tool Information:

Testing:
After working on the driver's airbag and belt tensioner restraint system, the system must be tested by means of the pulse display. This test is described at the end of this operation.

Removing:





- Switch ignition (1) off.
- Disconnect and cover battery negative terminal.
- Remove foot mat in passenger's footwell.
- Unscrew phillips screw (2) on foot rest.
- Disconnect foot rest upwards.
- Disconnect red 10-pin plug connection airbag (X29/9).
- Remove ash tray.
- Unscrew 2 phillips screws (4) on ash tray housing.
- Remove radio (5).
- Remove lateral right-hand covering grid plate (6) on center console.
- Pull off plug connection on control unit.
- Unscrew 2 torx bolts (7) on control unit.
- Remove control unit.
- Install in reverse order noting the following.

Installation Note: Arrow on control unit must point in driving direction. Install in reverse sequence.


Testing After Renewing the Control Unit:
There is a diagnosis program integrated in the control unit to test the control unit and the electrical components of the airbag system. When a fault is detected, the warning lamp (A1e15) does not go out after 4 s (previously 10 s). The faults detected are stored and may be called up in the form of a pulse display by means of the warning lamp (A1e15) or digitally by means of a pulse meter.

Note on Pulse Display:
The digits 1 - 10 appear on the display of the pulse meter. A 1 signifies that no fault is stored in the system. All other numbers are assigned to a certain group of faults. If there are several faults in the system the fault with the lowest pulse number is displayed first.

- If the light-emitting diode "U-Batt" lights up after connection, the pulse meter and power supply for the pulse meter are in order.
- When the first number reappears during the test after at least two or more pulse outputs (numbers) all faults have been read.

Diagnosis With Pulse Display:
- Connect pulse meter in accordance with the connection diagram.

NOTE: The light-emitting diode "U-Batt" in the display must light up.

- Switch on ignition.
- Press the start button for between 2 and 4 s.
- Display 1 means no fault in the system. If another number appears, rectify the fault in accordance with the fault-finding flow diagram. [1][2]Component Tests and General Diagnostics