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

DESCRIPTION

There are two types of hood ajar switches used on this vehicle. One type is a standalone switch that is serviceable. The second type is integrated into the hood latch assembly and is not serviceable separately from the hood latch. The standalone hood ajar switches are a normally closed, single pole, spring-loaded plunger actuated switch and the hood latch mounted hood ajar switch is a normally open single pole, spring-loaded plunger actuated switch. Only one type of switch is used per vehicle. Both types of hood ajar switches function with both the Vehicle Theft Alarm (VTA) system the optional remote starter system.





On the standalone switch the molded plastic switch body (5) has an integral molded connector receptacle (1) on the lower end containing two terminal pins. The switch is connected to the vehicle electrical system through a dedicated take out of the headlamp and dash wire harness. Two integral latches (2) lock the switch into a keyed mounting hole in the switch mounting bracket. The mounting bracket is secured to the upper radiator crossmember. A molded plastic striker secured to the underside of the hood panel inner reinforcement actuates the switch plunger as the hood panel is closed. The switch plunger (3) extends through a mounting collar (4) and a sleeve-like retainer ring on the upper end of the switch body. The retainer ring has a one time, self-adjustment feature that is activated after the switch is installed by closing the hood. The retainer ring is also color-coded to aid in identifying the switch application. A dark brown retainer ring identifies the underhood security switch application, while a white retainer ring identifies the remote starter system application.

Once a standalone hood ajar switch is installed it cannot be readjusted or repaired. If the switch is damaged, ineffective, or requires readjustment, it must be replaced with a new unit. The hood ajar switch striker is not intended for reuse. If the striker is removed from the hood inner reinforcement for any reason, it must be replaced with a new unit.





The hood latch mounted hood ajar switches are similar to the standalone hood ajar switches in the fact that they can not be adjusted or repaired. If damaged or inoperable this type of switch must be replaced but it is not serviceable separately from the hood latch and the hood latch assembly must be replaced.