Hood Sensor/Switch (For Alarm): Testing and Inspection

DIAGNOSIS AND TESTING

LATCH MOUNTED HOOD AJAR SWITCH

1. Disconnect and isolate the battery negative cable. Disconnect the wire harness connector from the hood ajar switch.

2. Check for continuity between the two terminals of the hood ajar switch. There should be continuity with the hood latch open, and only the continuity of the 1 kilohm diagnostic resistor with the hood latch closed. If OK, use a diagnostic scan tool and the appropriate diagnostic procedure to complete testing of the Body Control Module (BCM) (also known as the Common Body Controller/CBC) as well as the circuits between the BCM and the hood ajar switch. If not OK, replace the ineffective hood ajar switch.

STAND ALONE HOOD AJAR SWITCH

1. Disconnect and isolate the battery negative cable. Disconnect the wire harness connector from the hood ajar switch.

2. Check for continuity between the two terminals of the hood ajar switch. There should be continuity with the switch plunger extended, and only the continuity of the 1 kilohm diagnostic resistor with the switch plunger depressed. If OK, use a diagnostic scan tool and the appropriate diagnostic procedure to complete testing of the Powertrain Control Module (PCM) (also known as the Engine Control Module/ECM) as well as the circuits between the PCM and the hood ajar switch. If not OK, replace the ineffective hood ajar switch.