Acceleration/Deceleration Sensor: Service and Repair
WM 456155 Replacing combination sensor
Tools
Preliminary work
Preliminary work for removing and installing combination sensor
WARNING
Static battery charge
- Battery can explode
- Electrical discharges
-> Do not rub the battery with a dry cloth.
Information
Switch off all loads and remove the ignition key.
- Do not disconnect the battery while the engine is running.
- Disconnect and reconnect battery with extreme caution.
- Do not rub the battery with a dry cloth.
Information
The combination sensor is located under the centre console.
The functions listed below are integrated into the combination sensor:
- Rate-of-turn sensor
- Lateral acceleration sensor
- Axial acceleration sensor
1. Disconnect the battery. -> 2X00IN General information on disconnecting the battery Procedures
2. Remove centre console. -> 681719 Removing and installing centre console - section on "Removing" 681719 Removing and installing centre console
3. Disconnect electric plug connection for airbag triggering unit.
Removing combination sensor
WARNING
Combination sensor not calibrated or calibrated incorrectly
- Unexpected vehicle handling
- Combination sensor does not function
- Malfunction in combination sensor
-> Calibrate the vehicle after installing or replacing the combination sensor using PIWIS Tester II 9818.
-> Only perform calibration when the vehicle is positioned horizontally and the brake is not actuated.
Installation position of combination sensor
1. Release electric plug connection -2- for combination sensor -1- and pull it off -arrow-.
Removing combination sensor
2. Screw off fastening nuts -3- on the combination sensor -1-.
Installing combination sensor
1. Position the new combination sensor and centre it.
2. Tighten fastening nuts -3-.
Observe correct tightening torques. -> 4X00IN Tightening torques for anti-lock brake system (ABS) 4X00IN Tightening torques for anti-lock brake system (ABS)
Installing combination sensor
3. Plug in electric plug connection -2- on the combination sensor -1- ( -arrow- ) until it engages securely -a-.
Subsequent work
Subsequent work for removing and installing combination sensor
Information
Calibrate the vehicle after installing or replacing the combination sensor. -> 453019 Removing and installing hydraulic unit - section on "Removing and installing" Service and Repair
- Calibration must only be performed with the vehicle ]] standing horizontally with the brakes off [[.
1. Calibrate the combination sensor (includes lateral and axial acceleration sensor) with the help of 2nd generation PIWIS Tester 9818.
To do this, go to the menu:
> Control unit overview
> PSM
> Maintenance/repairs
> Sensor cluster calibration (combination sensor)
This completes the calibration.
2. Connect and lock electric plug connection for airbag triggering unit. -> 695319 Removing and installing airbag triggering unit - section on "Installing" 695319 Removing and installing triggering unit for airbag
3. Install centre console. -> 681719 Removing and installing centre console - section on "Installing" 681719 Removing and installing centre console
4. Connect the battery. -> 2X00IN General information on disconnecting the battery Procedures