Component Functional Description - Hood Latch/Ajar Switch 2

Component Functional Operation:  The Hood Ajar Switch 2 is a hard-wired input to the Electric Vehicle Control Unit (EVCU). The switch receives a 5.0 volt signal from the EVCU through an internal pull up resistor. When the switch is open the signal passes through the internal resistor and the resistance through the switch should be approximately 1000 Ohms. When the ajar switch is closed the signal passes through the switch directly to the return circuit and the resistance through the switch should read approximately 0.0 Ohms. The resistor inside the Hood Ajar Switch allows the EVCU the ability to detect the hood ajar status and diagnose the signal for an open condition. The EVCU is not able to detect a short low in the signal since this would be the same input as hood open/ajar. This failure mode would be detected by the rationality fault that compares the signal to the Hood Ajar Switch 1 signal received over the Can Bus from the Body Control Module (BCM).

Technical Data: 

Parameter	Nominal
Roc	1000 ohms	Courtesy of CHRYSLER GROUP, LLC
Rpu	N/A
Reference voltage	5.0v DC
Protection	Short to Ground/Short to Battery
Detection	Open Circuit/Short to Battery