Hood Sensor/Switch (For Alarm): Description and Operation

Hood Switch Input Circuit:

When the hood is closed (the hood switch is switched OFF), HIGH-level signals are sent to the ECU:

When the hood is opened (the hood switch is switched ON), LOW-level signals are sent to the ECU.

ECU terminal voltage (Connection condition of the ECU connector).

Hood Switch Input Circuit:

Hood Switch Input Circuit:

*Measurement is not possible by using a voltmeter, but is possible by using an oscilloscope.

Checking the hood switch circuit (Disconnect the connector of the ECU and check at the wiring harness side.)