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E90 General Vehicle Electrical
Capacitive Sensor 2
A change in capacitance at sensor 2 is achieved by placing the thumb on the grooved
area of the door handle. The change in capacitance generates a signal from sensor 2,
resulting in the TAGE sending a lock request via the K-Bus (CAS-Bus) to the CAS2.
Hall Sensor of the Outer Door Handle
The Hall sensor is redundant to the capacitive sensor 1. If the TAGE has switched off the
capacitive sensors, the Hall sensor is still operational after 192 hours which allows the
unlocking procedure to also be started via the Hall sensor.
The Hall sensor changes its status from low to high when the outer door handle is pulled.
The TAGE monitors the status of the hall sensor and consequently detects whether
access to the vehicle is requested.
The monitoring cycle takes place every 40 ms in order to save the vehicle battery. A sig-
nal is triggered when the sensor reaches a defined threshold. The electronic outer door
handle module detects the signal and switches on the power supply of the Hall sensor for
checking purposes.
Index Explanation Index Explanation
1
Electric field, capacitor 1
3
Capacitor plate, capacitive sensor 2
2
Electric field, capacitor 2
4
Capacitor plate, capacitive sensor 1
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