Dual Pole Arming Sensor

Located behind the left side of the instrument panel above the steering column, the Dual Pole Arming Sensor is a dual pole switch located in the driver/passenger deployment loop's power feed side (high side).
The Dual Pole Arming Sensor is calibrated to close at low level velocity changes (lower than the Discriminating Sensors'). This assures that both Inflator Modules are connected directly to the DERM's 36VLR or Ignition 1 voltage when either Discriminating Sensor closes. The Dual Pole Arming Sensor consists of a sensing element, normally open dual switch contacts, diagnostic resistors and two steering diodes. The sensing element closes the normally open dual pole switch contacts when the vehicle velocity changes at a rate indicating potential need for deployment.
Two diagnostic resistors are connected in parallel with both normally open switch contacts and allow a small amount of current through each deployment loop during normal non-deployment conditions. This small current flow results in voltage drops across each component within the two loops. The DERM monitors these voltage drops to detect circuit or component faults. The pair of two steering diodes provide isolation between the DERM's 36VLR outputs and Ignition 1 voltage.