Rain/Light Sensor: Initialization

Due to the optical process, the rain sensor has to be adapted to the windscreen. This adaptation takes place at initialization.

A prerequisite  for trouble-free initialization is that the windscreen glass is dry, clean and free of defects in the area of the rain sensor.

The initialization is performed using the "Initialize rain sensor" service function in the BMW diagnosis system. In the service function, the adaptation values in the rain sensor are deleted. This is followed by adjustment of the sensor system to the windscreen based on the following sequence:

• Switching off the rain sensor
• Switch off terminal 15 and terminal R
• Switch on terminal R and terminal 15 and wait 10 seconds

In the 10-second waiting period, the new adaptation values are determined and stored.

Initialization of the rain sensor is necessary:

• After replacing the windscreen
• After replacement of the rain/light sensor