Trunk/Liftgate Sensor/Switch (For Alarm): Description and Operation

When the liftgate is closed (the liftgate switch is switched OFF) HIGH-level signals are sent to the ECU.

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

Check Chart 7: ECU Terminal No. 17:

ECU Terminal Voltage (Connection condition of the ECU connector).