Rain Sensor: Service and Repair
WM 921219 Removing and installing rain sensor
Preliminary work
Remove interior rearview mirror. -> 682719 Removing and installing interior rearview mirror - section on "Removing"
Removing rain sensor
NOTICE
Voltage peaks
- Risk of damage to electrical load or to the control unit
-> Remove remote control and switch off ignition before disconnecting or removing electrical load.
Installation position of rain sensor
1. Switch off ignition and remove remote control.
2. Using a plastic wedge, carefully detach the rain sensor -1- out of the adhesive plate -2-.
Removing rain sensor
3. Pull off electrical plug connection -1-.
Disconnecting plug connection
Installing rain sensor
Information
Limited functionality of the rain sensor if the following points are not observed:
- When assembling the rain sensor, air must not be trapped between the windscreen and the silicone layer on the rain sensor.
- When installing the rain sensor, a temperature of approx. 20°C for the windscreen and the rain sensor must be ensured. If necessary, carefully heat the windscreen with a hot-air gun or similar.
- Contact surface must be free of grease and dirt.
- The sensor on the silicone surface must not be touched by fingers.
- If the sensor is new, remove the protection cap before the sensor is pressed onto the windshield.
- When inserting a new sensor, make sure that no air pockets are caught between the silicone and the windscreen. Air pockets could impair the function of the sensor.
1. Clean inner area of adhesive plate.
2. Insert the electrical plug connection -1- until the connector engages securely.
Plugging in plug connection
3. Remove the protection cap from the sensor.
4. Position the sensor -1- and insert it into the adhesive plate -2-.
Inserting sensor
5. To check the function of the rain sensor: Use a spray bottle filled with water to moisten the windscreen (in the area of the rain sensor) and switch on the windscreen wiper.
Subsequent work
Install interior rearview mirror. -> 682719 Removing and installing interior rearview mirror - section on "Installing"