2. Verify DTC B0052 is not set.
锟斤拷 If DTC B0052 is set, clear DTCs. If the DTC sets, replace the SDM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Refer to Control Module References (See: Testing and Inspection/Programming and Relearning) for SDM replacement, setup, and programming
B0071
DTC B0071
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B0071 03
- Passenger Seat Belt Tension Sensor Circuit Voltage Below Threshold
DTC B0071 04
- Passenger Seat Belt Tension Sensor Circuit Open
DTC B0071 07
- Passenger Seat Belt Tension Sensor Circuit Voltage Above Threshold
Diagnostic Fault Information
Circuit/System Description
The inflatable restraint seat belt tension sensor is a 3-wire potentiometer mounted on the buckle side of the passenger seat belt and provides an input
to the passenger presence system (PPS). When an infant car seat is properly restrained on the front passenger seat, the seat belt is tightly secured
through the car seat. The seat belt pulls on the tension sensor and changes the voltage signal to the PPS module. The PPS monitors the belt tension
sensor signal circuit and if a fault is detected, DTC will be set. When the PPS detects this DTC it will send out a serial data message and the SDM
will notify the customer of the enable/disable status by illuminating the OFF indicator on the PASSENGER AIR BAG ON/OFF indicators. The
SDM will then suppress the deployment of the instrument panel (I/P) module and illuminate the AIR BAG indicator.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
Conditions for Setting the DTC
* The PPS detects the voltage at the belt tension sensor signal circuit is less than 0.5 volt or greater than 4.5 volts for 1 second.
* The PPS detects the voltage at the belt tension sensor voltage reference circuit is less than 4.5 volts or greater than 9.1 volts for 1 second.
* The PPS detects the amperage at the belt tension sensor low reference circuit is 25 MA or greater for 1 second.
Action Taken When the DTC Sets
* The PPS will set a DTC, and then communicate with the SDM.
* The SDM will set DTC B0081 0F.
* The SDM disables the Passenger Airbag Module.
* The PPS will illuminate the Passenger Airbag status OFF indicator.
* The SDM requests the instrument panel cluster (IPC) to illuminate the AIRBAG indicator.
