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BMW SRS 3 DTC Diagnostics Sheet

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Follow Repair Manual. Check driver's buckle switch. Measure resistance between pin 3 and pin 1. Replace driver's seatbelt lock. Check and repair if ...

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BMW SRS 3 DTC Diagnostics SheetPage 1U3SRS Fault Codes System 3FAULT CODEEXPLANATIONTROUBLESHOOTING*1SRS Control Unit ErrorThe SRS control unit has failed its own internal diagnostic. This code is can also be set when overcharging or low battery conditions occur. To verify failure: Delete fault stored in memory operate vehicle for 5 minutes. Test for fault codes. If the fault recurs the SRS Control Unit will need replacement.2Airbag Ignition Circuit Drivers Side DefectiveThis fault is often stored during repair of other components (removal of steering wheel or instrument cluster). Disconnect connector from generator module. Check wires from control unit pin 10 to contact ring pin 1 and pin 11 to contact ring pin 2 for continuity. Measure resistance of squib (detonator) at generator module (1.8 5.6 ohms). Replace if out of range. Check steeringwheel contact ring. Connect generator module and measure resistance at controlunit plug between pin 10 and pin 11 (1.8 5.6 ohms). Replace steeringwheel contact ring. If the fault code recurs replace control unit.3Seatbelt Tensioning System Firing Circuit Driver SideDisconnect plug connection between seat wiring harness and vehicle wiring harness. Measure resistance between pins 9 and 10 (seat side) (1.8 5.6 ohms). Disconnect plugin connection to gas generator. Measure continuity from firing generator connection pin 1 to plug seat connection pin 9 and from firing generator connection pin 2 to plug seat connection pin 10. If ok replace the gas generator of the driver's seatbelt tensioner.Disconnect plugin connection from airbag control module. Check continuity of pin 1 to plug seat vehicle wiring harness connection pin 9 and from airbag control module pin 2 to plug seat vehicle wiring harness connection pin 10.Visually inspect the wires and plugin connections.Measure resistance at plugin connection of driver's seat (controlunit side) between pin 6 and pin 7 (value < 1 ohm)Measure voltage between pin 9 (seat side) and ...

Source: www.europeantransmissions.com

 

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