• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | High Resistance | Open | Short to Voltage |
---|---|---|---|---|
Belt Tension Sensor Voltage Reference | B0071 03 | -- | B0071 03 | -- |
Belt Tension Sensor Signal | B0071 03 | -- | B0071 04 | B0071 07 |
Belt Tension Sensor Low Reference | -- | -- | B0071 07 | -- |
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.
Ignition voltage is between 9-16 volts.
• | 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. |
• | 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. |
• | The condition for setting the DTC no longer exists. |
• | A history DTC will clear once 100 malfunction-free ignition cycles have occurred. |
Inspect the passenger seat belt tension sensor signal, voltage reference, and low reference circuits carefully for cutting and/or chafing.
SIR System Description and Operation
Control Module References for scan tool information
Important: The seat belt buckle replacement with the seat belt tension sensor must be serviced as a complete unit.
When removing connectors, inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector:• | Seat belt tension sensor |
• | PPS module |
• | Seat belt tension sensor wiring harness connector |
• | PPS module wiring harness connector |
⇒ | If damage or corrosion is found, repair or replace as necessary. |
⇒ | If less that the specified range, test the voltage reference circuit for open/high resistance or a short to ground. If the circuit tests normal, replace the PPS. |
⇒ | If greater that the specified range, test the voltage reference circuit for a short to voltage. If the circuit tests normal, replace the PPS. |
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the PPS. |
⇒ | If less than the specified value, test the signal circuit for a short to ground. |
⇒ | If greater than the specified range, test the circuit for a short to voltage |
⇒ | If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the PPS. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for PPS replacement, setup, and programming |