Impact Sensor: Service and Repair

695119 Removing And Installing Airbag Sensor

Tools

Tools:

Preliminary work

Preliminary work for front airbag sensor
1. Disconnect battery.
2. Remove front apron.

Preliminary work for centre airbag sensor
1. Disconnect battery.
2. Remove front seat.
3. Remove the rear side-panel lining.
4. Remove sill.
5. Undo screw fastening seat belt to the body.

General warning notes

Safety instructions for airbag sensor

CAUTION:
Incorrect triggering of airbag modules.
- Danger of injury and material damage if airbag sensors are not handled correctly.
- Remove ignition key. Disconnect battery. Route or isolate ground strap so that all contact with a ground carrier (e.g. body, seat frame) is avoided.
- Always wait one minute after disconnecting the battery before disconnecting the connector from the sensor.
- The airbag sensor must not be removed with the plug plugged in
- The airbag sensors cannot be interchanged. Install the sensor listed in the Spare Parts Catalogue (PET).
- Always replace fastening nuts and bolts of sensors after customer service and reworking.
- Never make alterations to the micro-encapsulated nuts and bolts which have a negative effect on the bond (e.g. using lubricant, loosening bolts and screwing them down again).

Tools and materials

Tools
Removal tool, universal NR.21

Removing airbag sensor

Removing sensor for front airbag






A - Sensors for front airbag
B - Sensors for centre airbag






1. Unlock electrical connector -1--A- and remove from sensor.







2. Unscrew the two fastening nuts -2- and remove the sensor.

Removing sensor for centre airbag
1. Disengage floor covering at the support and lay it in the vehicle interior.







2. Unlock locating peg -1- using the removal tool.







3. Unscrew fastening screws -2- and nuts -3- and carefully pull the support up and out of the retaining points.
Incorrect triggering of airbag modules.







4. Unscrew the two fastening nuts -2-.







5. Unlock electrical connector -A- and remove sensor.

Installing airbag sensor

Installing sensor for front airbag







1. Position sensor on retaining bracket and screw it down with the fastening nuts -2-. M6: 8 Nm (6 ftlb) ± 1 Nm (± 0.5 ft.lb.)







2. Push on the electrical connector -1- and lock.

Installing sensor for centre airbag
Incorrect triggering of airbag modules.







1. Position sensor on the body and screw it down with the fastening nuts -2-. M6: 8 Nm (6 ftlb) ± 1 Nm (± 0.5 ft.lb.)





2. Push on the electrical connector until it clicks into place.







3. Position the support and engage in lower side member.







4. Clip in locating peg -1- and check it is seated correctly.
5. Tighten the plastic fastening nuts -3-.
6. Screw in fastening screws -2-. Final tightening: 7.2 Nm (5.5 ft.lb.)
7. Lay the floor covering over the support and engage.

Reworking

Work in wake of front airbag sensor
1. Install front apron.
2. Connect the battery .
3. Using the PIWIS Tester 97180, read out the fault memory and erase if required. If further faults exist, proceed in accordance with airbag diagnosis fault code.

Work in wake of centre airbag sensor
1. Screw in screw fastening seat belt to the body.
2. Insert sill.
3. Install the rear side-panel lining.
4. Installing front seat.
5. Connect the battery .
6. Using the PIWIS Tester 97180, read out the fault memory and erase if required. If further faults exist, proceed in accordance with airbag diagnosis fault code.