Section 4 (Air Bag Restraint Systems): Diagnostics: Notes
WARNING: This page is about a different car, the 2000 Volvo S80 and 1999 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Failure to follow SERVICE PRECAUTIONS may result in air bag deployment and personal injury. See AIR BAG SAFETY PRECAUTIONS
.
NOTE:
After component replacement, ensure proper system operation. Perform See SYSTEM OPERATION CHECK
. DO NOT use ohmmeter or other self-powered meter to test resistance of air bag inflator/module or seat belt tensioner. Use SRS Test Resistor (998 1506) in place of air bag modules or seat belt tensioner when testing resistance of any SRS circuit. SRS test resistor specified resistance is 1.8-2.5 ohms, which is same as components it replaces. Test resistor can be "deployed" if deployment voltage is applied to it while connected to SRS. Ensure test resistor resistance is as specified after each use. If resistance is not as specified, replace test resistor.
SRS control module has on board diagnostic (OBD) system to provide self diagnosis and other information. Diagnostic Trouble Codes (DTCs) can be read using VADIS connected to the Data Link Connector (DLC). See Fig 1 . When ignition is on, SRS OBD system performs an initial self test. After self-test is completed, SRS OBD goes into monitoring mode. The system checks for internal faults in all SRS components and in output for SRS warning light.
NOTE:
If SRS warning light is on, there is a fault in the SRS system.