Ambient Light Sensor: Service and Repair

Rain/Light Recognition Sensor (G397)

The rain/light recognition sensor is designed so that it can be used again. The only requirement to use it again is that the connecting pad must not be damaged.

Store the removed rain/light recognition sensor in a dust-free area and keep the silicone connecting pads from getting dirty.

• If the rain sensor was replaced by another rain sensor having a different part number, it is necessary to code the new rain sensor. Refer to => [ Rain/Light Recognition Sensor (G397), Coding ] Testing and Inspection.

• Rain sensors cannot be interchanged. Refer to Electronic Parts Catalog (ETKA) for the correct rain sensor.

Removing

- Switch off the ignition and all electrical consumers and remove the ignition key.

- Remove the interior rearview mirror.

- Disconnect the connector - A - from the rain/light recognition sensor - 1 -.






- Pry the rain/light recognition sensor - 1 - by the opening - 3 - out of the retaining plate - 2 - carefully using a screwdriver.






• During removal, pry off the complete rain/light recognition sensor and not just the upper shell of the sensor.

Installing

Install in reverse order of removal. Note the following:

• Always clean the windshield surface inside the rain/light recognition sensor bracket before installing. Remove any traces of the connecting pad still remaining on the windshield.

• Surface (connecting pads) of rain/light recognition sensor must not be soiled or damaged when installing. Always replace a sensor that has a damaged connecting pad.

• If the surface (connecting pads) of the rain/light recognition sensor is soiled, it can be potentially cleaned by applying and then pulling off one or more adhesive strips.

- Clean the windshield thoroughly around the retaining plate with cleaning solution.

- Remove the cap from the new rain/light recognition sensor, if necessary.

- Insert the rain/light recognition sensor - 1 - into the retaining plate on the windshield - 2 - and then press it in securely.






• Even if the sensor is installed correctly, small air bubbles can form between the windshield and the connecting pad. The contact surface must be free-of-bubbles after approximately 10 minutes.

- Connect the connector - A - and then install a wire cover to secure the rain sensor.






- Install the interior rearview mirror.

- Code the rain/light recognition sensor, if necessary. Refer to => [ Rain/Light Recognition Sensor (G397), Coding ] Testing and Inspection.