Yukon/Denali 4WD V8-4.8L VIN V (2005)
Impact Sensor: Description and Operation
Passenger Seat Belt Tension Retractor Sensor
INFLATABLE RESTRAINT PASSENGER SEAT BELT TENSION RETRACTOR SENSOR
The seat belt tension retractor sensor is used to enhance the passenger presence system (PPS) when an infant car seat is properly restrained on the front
outboard passenger seat. The seat belt tension retractor sensor is a three-wire potentiometer mounted on the lower seat belt anchor and provides an input
to the PPS module. When an infant car seat is properly restrained on the front passenger seat, the seat belt is tightly secured through the infant car seat.
The seat belt pulls on the tension sensor and changes the voltage signal to the PPS module. The PPS module uses the voltage signal to help determine if a
tightly belted infant car seat is installed. The PPS uses the inputs from the seat belt tension retractor sensor and the PPS pressure sensor to determine if
the I/P module should be suppressed or enabled. The PPS monitors the seat belt tension retractor sensor circuits and sets diagnostic trouble code (DTC)
023 if a fault is detected. To determine what DTCs have been set by the PPS, the Tech 2 is used to command the SDM to request the PPS to flash the
DTCs using the PASSENGER AIR BAG ON/OFF indicators located on the rear view mirror.
