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B0079 08 The SDM detects the SPS signal circuit is invalid for 500 milliseconds. Action Taken When the DTC Sets The SDM sets a DTC B0079. The SDM defaults the SPS to seat rearward threshold. The SDM commands the AIR BAG indicator ON. 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. 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
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 SPS. 2. Disconnect the harness connector at the SDM. 3. Ignition ON, test for less than 1 volt between the SPS signal circuit terminal 29 and ground. If greater than the specified range, test the circuit for a short to voltage. 4. Ignition ON, test for less than 1 volt between the SPS low reference circuit terminal 28 and ground. If greater than the specified range, test the circuit for a short to voltage. 5. Test for infinite resistance between the SPS signal circuit terminal 29 and ground. If less than infinite resistance, test the circuit for a short to ground. 6. Test for less than 1 ohm of the SPS signal circuit between the SDM harness connector terminal 29 and the SPS harness connector terminal 2. If greater than the specified range, test the circuit for an open/high resistance. 7. Test for less than 1 ohm of the SPS low reference circuit between the SDM harness connector terminal 28 and the SPS harness connector terminal 1. If greater than the specified range, test the circuit for an open/high resistance. 8. If all circuits test normal, replace the SPS. 9. Reconnect all SIR components. Ignition ON, with a scan tool clear and recheck for DTCs. If the front end sensor DTC returns and is current, replace the SDM. After Repair Procedures Inflatable Restraint Front Passenger Position Sensor Replacement SIR/SRS Wiring Repairs Control Module References for SDM replacement, setup, and programming Repair Verification IMPORTANT: When removing connectors, inspect for damage or corrosion. Damage or corrosion in the following requires repair or The Seat Position Sensor (SPS) The Sensing and Diagnostic Module (SDM) module The seat position sensor wiring harness connector The SDM wiring harness connector
2008 Chevrolet Silverado 1500 2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Ignition ON, use the scan tool to clear the DTCs then recheck for DTCs. Verify no DTCs are set. If DTC B0079 was current, replace the SDM. DTC B0081 Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using the 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 B0081 0F Passenger Presence System Erratic DTC B0081 39 Passenger Presence System Internal Electronic Failure DTC B0081 3A Passenger Presence System Incorrect Component Installed DTC B0081 71 Passenger Presence System Invalid Serial Data Received Circuit/System Description When the ignition is turned ON, the passenger presence system (PPS) and the inflatable restraint Conditions for Running the DTC
2008 Chevrolet Silverado 1500 2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Ignition voltage is between 9-16 volts. Conditions for Setting the DTC All of the following conditions must exist for 5 seconds: B0081 0F The SDM has received a fault present message from the PPS. The PPS is in assembly plant mode and the SDM is in production mode. B0081 39 The SDM has received a critical malfunction message from the PPS. B0081 3A The SDM has received a message from the PPS which indicates a vehicle and PPS mismatch. B0081 71 The SDM has received invalid or no serial data from the PPS. Action Taken When the DTC Sets The SDM commands the AIR BAG indicator ON, and the passenger air bag indicator to The I/P module deployment loop will be disabled. Conditions for Clearing the DTC The condition for setting the DTC no longer exists and there is no activity on the low speed A history DTC will clear once 100 malfunction-free ignition cycles have occurred. Diagnostic Aids If either the SDM or PPS were replaced, verify that the correct part numbers were used for the Reference Information Schematic Reference
2008 Chevrolet Silverado 1500 2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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