Tahoe 2WD V8-4.8L VIN V (2004)
Impact Sensor: Description and Operation
Inflatable Restraint Seat Position Sensors (SPS)
INFLATABLE RESTRAINT SEAT POSITION SENSORS (SPS)
The seat position sensor (SPS) is used to determine the proximity of a front driver or passenger seat position with respect to the frontal air bag. The SPS
interfaces with the SDM. The state of the SPS allows the SDM to disable stage 2 of the frontal air bag for a front seat that is forward of a
forward/rearward point in seat track travel. The SPS is a Hall effect sensor that is mounted on the outboard seat track of both the driver and passenger
seats. The seat track includes a metal bracket that shunts the SPS magnetic circuit creating two states of seat position. The shunted state represents a
rearward seat position. The non-shunted state represents a forward position. The SPS provides two current ranges, one range for the shunted state and a
second range for a non-shunted state. These two states are inputs to the sensing and diagnostic module (SDM). State 1 (shunted) being the rearward
threshold and state 2 (non-shunted) being the forward threshold. When the SDM receives input from a SPS that state 1 threshold is reached (seat is
rearward) the SDM will not disable stage 2 deployment, if required by the deployment sensors. When state 2 threshold is reached (seat is forward) the
SDM will disable stage 2 deployment on the side the seat is forward. The SDM monitors the SPS circuit and if a fault is detected the SDM will set codes
B0083 or B0084 and defaults to disabling stage 2 frontal deployment. This will only default on the side of the vehicle the sensor has a fault. It's
important to understand that the SPS is secondary to the passenger presence system (PPS) and the manual I/P module disable switch. If either one of
these devices are in the disable mode the passenger air bag will not deploy regardless of the SPS status.
