Re: What does the hood switch do? - Saab 9-5 Bulletin Board - Saabnet.com
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Re: What does the hood switch do?
Posted by saabdoc [Email] (more from saabdoc) on Sun, 1 Nov 2009 22:20:28
In Reply to: What does the hood switch do?, AlS, Sun, 1 Nov 2009 22:05:29
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Its used by the alarm system.
Heres what WIS says about it.
General
The bonnet switch is located in the rear edge to the left in the engine bay and works as a sensor for the bonnet. The switch is connected to pin 41 on TWICE.
Function
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.
posted by 71.110.10...
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