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Bonnet Switch: General: Function

WARNING: This page is about a different car, the 2002 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.

A pulse width-modulated (approx. 3.5%) voltage is supplied continuously from the control module via a 1 kohm pull-up in TWICE to the switch. From this voltage, the control module can detect whether the bonnet is opened when the alarm is armed by testing the voltage at the input concerned.

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