Operation

OPERATION

The hood ajar switch is a normally closed switch that is held open as the spring-loaded switch paddle is depressed by the hood catch on the hood inner panel when the hood panel is closed and latched. When the hood is opened, the spring-loaded switch paddle extends from the switch body and the switch contacts are closed. The switch is connected in series between ground and the hood ajar switch sense input of the Roof Control Module (RCM) (also known as the Overhead Control Panel/OCP control unit or DBE). The RCM uses an internal resistor pull up to monitor the state of the hood ajar switch contacts.

The hood ajar switch as well as the hard wired circuits between the switch and the RCM may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the electronic controls or communication between modules and other devices related to hood ajar switch operation that provide some features of the export vehicle theft or domestic remote starter systems. The most reliable, efficient, and accurate means to diagnose the electronic controls and communication related to hood ajar switch operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.