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Service Manual Volvo Trucks THIS MANUAL COVERS THE FOLLOWING SUBJECTS: SRS Airbag Safety Belts Bunk Restraints FOR MODELS : VN & VHD Contents General SRS Airbag, Safety Belts and Bunk Restraints Specifications SRS Components, Torque Values Safety Belts and Bunk Restraints, Torque Values Tools Special Tools Other Special Equipment Design and Function Safety Belts and Bunk Restraints Supplemental Restraint System (SRS) System Overview Supplemental Restraint System (SRS) Components SRS Control Unit (ECU) Control Unit Connector Airbag Module Airbag Module Connector Contact Reel SRS Indicators (vehicles built prior to 3/99) SRS Indicators (vehicles built from 3/99) Diagnostic System with Fault Codes 7 SRS Wiring Harness Supplemental Restraint System (SRS) Wiring Diagram Troubleshooting General Work Practices Test Resistor, Checking Connecting the Test Resistor Reading Fault Codes MID 232 SID 254 FMI 12 Airbag Control Unit, Component Failure MID 232 SID 1 FMI 6 Igniter Loop, Current High/Short Circuit MID 232 SID 1 FMI 5 Igniter Loop, Current Low/Open Circuit MID 232 SID 1 FMI 4/3 Igniter Loop, Voltage Shorted Low/High MID 232 SID 240 FMI 14 SRS Airbag, Crash Data Stored Faults Which Do Not Generate a Fault Code SRS Lamp Does not Light 44 SRS Lamp Does not Light and Not Responding Message in Diagnostic Display The SRS Lamp is Lighting but no Fault Code is Stored Routines for a Damaged/Faulty Airbag Module Safety Belts and Bunk Restraints, Inspection Service Procedures General Work Practices After the Airbag Deploys Airbag Module/Contact Reel, Replacement SRS ECU, Replacement SRS Wiring Harness, Replacement Safety Belt, Replacement (One) National Seat Safety Belt, Replacement (One) Volvo Seat Lower Bunk Restraint, Replacement VN 420/610/660 Lower Bunk Restraint, Replacement VN 770 Upper Bunk Restraint, Replacement VN 610/660 Upper Bunk Restraint, Replacement VN 770