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Conditions for Running the DTC Ignition voltage is between 9-16 volts. Conditions for Setting the DTC The following conditions exist for at least 10 seconds. B1370 01 The SDM detects a short to battery in the ignition 1 voltage circuit when the switch is in the OFF B1370 06 The SDM detects a short to ground or an open in the ignition 1 voltage circuit when the ignition Action Taken When the DTC Sets The SDM commands the AIR BAG indicator ON. The SDM determines its power mode only from the GMLAN power mode messages and 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 A history DTC maybe caused by an intermittent short or open in the ignition 1 circuit. Reference Information Schematic Reference SIR Schematics Connector End View Reference Component Connector End Views Description and Operation
2008 Chevrolet Silverado 1500 2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 Circuit/System Testing 1. Ignition OFF, remove the underhood AIR BAG IGN fuse 39. 2. Ignition ON, test for 9-16 V between the voltage supply side and ground. If not within the specified range, refer to DTC B1370 . 3. Ignition OFF, remove the SDM harness connector. 4. Ignition OFF, test for less then 1 ohm between the ignition 1 voltage circuit terminal 32 and the underhood fuse block terminal G2 (X5). If greater then the specified range, test the circuit for an open/high resistance. 5. Ignition ON, test for less then 1 volt between the SDM harness connector ignition 1 voltage circuit terminal 32 and the underhood fuse block terminal G2 (X5). If greater then the specified value, test the circuit for a short to voltage. 6. If all circuits test normal, reconnect all connectors, replace fuse, clear all DTCs. If DTC B1370 stays current, replace the SDM. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. IMPORTANT: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or SDM SDM wiring harness
2008 Chevrolet Silverado 1500 2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
SIR/SRS Wiring Repairs Control Module References for SDM replacement, setup, and programming PASSENGER PRESENCE SYSTEM REZEROING Introduction The Inflatable Restraints Passenger Presence System (PPS) is a calibrated system that requires 1. Read this procedure carefully and completely. 2. The PPS will not function properly if the PPS rezeroing procedure is not performed. 3. Perform the Diagnostic System Check - Vehicle after successfully completing the rezeroing procedure to ensure the system is functioning properly. Passenger Presence System (PPS) Rezeroing Procedure 1. Empty the front outboard passenger seat. 2. Verify that all SIR and PPS components, connectors, and connector position assurances (CPAs) are properly connected and mounted. 3. Install a scan tool. 4. Turn ON the ignition, with the engine OFF. IMPORTANT: The following procedures must be followed: IMPORTANT: Before rezeroing the PPS, the front passenger seat must be completely empty of all items. The presence of any items on the IMPORTANT: DTC B0081 4B may be set prior to rezeroing the system if the system was replaced with a service kit. All other SIR and PPS
2008 Chevrolet Silverado 1500 2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
5. Use the scan tool in order to clear the SIR and PPS DTCs. 6. With a scan tool, request the PPS rezeroing procedure. 7. Initiate the PPS rezeroing procedure. The PPS will illuminate both PASSENGER AIR BAG ON and OFF indicators until the rezeroing procedure has been completed. 8. When the rezeroing procedure has been successfully completed, the PPS will display the current system status. 9. If the rezeroing procedure was unsuccessful, repeat this procedure. Due to the communication status between the SDM and the PPS module, this procedure may have to be 10. After the PPS has been successfully rezeroed, perform the Diagnostic System Check - Vehicle . SYMPTOMS - SIR Visual/Physical Inspection Inspect for aftermarket devices which could affect the operation of the SIR system. Refer to Inspect the easily accessible or visible system components for obvious damage or conditions Intermittent Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to IMPORTANT: The following steps must be completed before using the Symptom Tables. 1. Perform the Diagnostic System Check - Vehicle , before using the Symptom Tables in order to verify that all of the There are no DTCs set. The control module(s) can communicate via the serial 2. Review the system operation in order to familiarize yourself with the system functions. Refer to SIR System Description
2008 Chevrolet Silverado 1500 2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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