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Circuit/System Description The inflatable restraint seat belt tension sensor is a 3-wire potentiometer mounted on the buckle 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 The PPS detects the voltage at the belt tension sensor voltage reference circuit is less than The PPS detects the amperage at the belt tension sensor low reference circuit is 25 MA or Action Taken When the DTC Sets The PPS will set a DTC, and then communicate with the SDM. The SDM disables the I/P module deployment loop. The PPS will turn ON the passenger air bag status OFF indicator. The SDM commands the AIR BAG indicator ON. Circuit Short to Ground High Resistance Open Short to Voltage Belt Tension Sensor Voltage B0071 03 B0071 03 B0071 03 - Belt Tension Sensor Low - B0071 07 B0071 07 - Belt Tension Sensor Signal B0071 03 B0071 03, 07 B0071 03, 07 B0071 07
2008 Chevrolet Silverado 1500 2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Conditions for Clearing the DTC The condition for setting the DTC no longer exists. A history DTC will clear once 100 malfunction-free ignition cycles have occurred. Diagnostic Aids Inspect the passenger seat belt tension sensor signal, voltage reference, and low reference circuits Reference Information Schematic Reference SIR Schematics Connector End View Reference Component Connector End Views Description and Operation SIR System Description and Operation Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for scan tool information Circuit/System Testing IMPORTANT: The seat belt tension sensor is not serviced separately. The seat belt buckle replacement with the seat belt tension sensor must be
2008 Chevrolet Silverado 1500 2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
1. Ignition OFF, disconnect the harness connector at the seat belt tension sensor and inspect the component and harness sides for damage or corrosion. If damage or corrosion is found, repair or replace as necessary. 2. Ignition ON, test for 4.5-5.5 volts between the voltage reference circuit terminal B and ground. If less that the specified range, test the voltage reference circuit for open/high If greater that the specified range, test the voltage reference circuit for a short to 3. Ignition OFF, remove the AIR BAG BATT Fuse in the underhood fuse block. Test for less than 2.0 ohms between low reference terminal A and ground. If greater than specified, test the low reference circuit for open/high resistance. If the 4. Ignition OFF, disconnect the harness connector at the PPS module. 5. Ignition ON, test for infinite resistance between the signal circuit terminal C and ground. If less than the specified range, test the signal circuit for a short to ground. 6. Ignition ON, test for less than 1 volt between the signal circuit terminal C and ground. If greater than the specified range, test the circuit for a short to voltage 7. Test for less than 1 ohm in the signal circuit between the PPS module terminal 4 and the belt tension sensor terminal C If greater than specified, test the signal circuit for open/high resistance. If the circuit 8. If all circuits test normal, replace the passenger seat belt buckle which includes the seat belt Damage or corrosion in the following requires repair or The seat belt tension sensor The PPS module The seat belt tension sensor wiring harness connector The PPS module wiring harness connector IMPORTANT: The AIR BAG BATT Fuse must be removed to ensure the PPS module is inactive. An active PPS module may cause
2008 Chevrolet Silverado 1500 2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
tension sensor. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Front Seat Belt Buckle Replacement SIR/SRS Wiring Repairs Control Module References for PPS replacement, setup, and programming DTC B0072 OR B0073 Diagnostic Instructions 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. DTC Descriptors DTC B0072 01 LF Seat Belt Sensor Circuit Short to Battery DTC B0072 02 LF Seat Belt Sensor Circuit Short to Ground DTC B0072 04 LF Seat Belt Sensor Circuit Open Circuit DTC B0072 06 LF Seat Belt Sensor Circuit Short To Ground or Open Circuit DTC B0072 08 LF Seat Belt Sensor Circuit Signal Invalid DTC B0073 01
2008 Chevrolet Silverado 1500 2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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