RAM 2500 Van V6-239 3.9L Magnum (1995)
Impact Sensor: Description and Operation
PURPOSE
Provides verification of the direction and severity of an impact.
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Threshold sensitive switches that complete an electrical circuit when an impact of sufficient G force closes the switch.
DESCRIPTION
The impact sensor provides verification of the direction and severity of an impact. One impact sensor is used. It is located inside the Airbag
Control Module (ACM), which is secured to a bracket under the left side front bucket seat inside the vehicle.
OPERATION
The impact sensor is an accelerometer that senses the rate of deceleration. The microprocessor in the ACM monitors the impact sensor signal. A
pre-programmed decision algorithm in the microprocessor determines when the deceleration rate indicates an impact is severe enough to require
airbag system protection. When the programmed conditions are met, the ACM sends an electrical signal to deploy the airbag system components.
The impact sensor is calibrated for the specific vehicle. The sensor is only serviced as a unit with the ACM. The sensor cannot be repaired or
adjusted and, if faulty or damaged, the ACM unit must be replaced.
