900 S Hatchback L4-2290cc 23L DOHC EFI (1997) Door Sensor/Switch Component Locations - Page 552
Bonnet switch
The bonnet switch is located beside the main fuse box in the engine bay and is included as a sensor for the bonnet. The' switch is connected to the control
module (pin 16).
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When the bonnet is closed, the voltage between the switch and ground should be +12 V.
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When the bonnet is opened, the switch is grounded. The voltage between the switch and ground is thus 0 V. The alarm is set off.