Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.

DTC B2773, B2774, B2775, B2776 DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE Using the WDS or equivalent, verify the following PID/DATA monitor. (See PID/DATA MONITOR TABLE .) DR_CURTN Is the resistance of the driver-side curtain air bag module normal? Resistance: 1.4-3.2 ohms	Yes	[Present malfunction diagnosis] Replace the SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION .) [Past malfunction diagnosis] DTC troubleshooting completed.
1		No	Go to the next step.
2	INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE CONNECTOR WARNING: Handling the air bag system components improperly can accidentally deploy the air bag modules and pre-tensioner seat belts, which may seriously injure you. Read the service warnings and cautions before handling the air bag system components. (See SERVICE WARNINGS .) (See SERVICE CAUTIONS .) Turn the ignition switch to the LOCK position. Disconnect the negative battery cable and wait for 1 min or more. Disconnect the driver-side curtain air bag module connector. Is there any malfunction of the driver-side curtain air bag module connector?	Yes	Replace the air bag wiring harness.
2		No	Go to the next step.
3	VERIFY WHETHER MALFUNCTION IS IN DRIVER-SIDE CURTAIN AIR BAG MODULE OR RELATED WIRING HARNESS Connect the leads of the SST (Fuel and thermometer checker) or apply 2-ohm resistance to driver-side curtain air bag module connector terminals A and B. Set the resistance of the SST (Fuel and thermometer checker) to the 2-ohm position. Connect the negative battery cable. Turn the ignition switch to the ON position. Using the WDS or equivalent, verify the following PID/DATA monitor. (See PID/DATA MONITOR TABLE .) OD_D_CURT Are related wiring harnesses normal?	Yes	Replace the driver-side curtain air bag module. (See CURTAIN AIR BAG MODULE REMOVAL/INSTALLATION .)
3		No	Replace the air bag wiring harness, then go to the next step.
4	INSPECT SAS CONTROL MODULE Turn the ignition switch to the LOCK position. Disconnect the negative battery cable and wait for 1 min or more. Connect the driver-side curtain air bag module connector. Are DTCs B2773, B2774, B2775 and/or B2776 indicated?	Yes	[Present malfunction diagnosis] Replace the SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION .) [Past malfunction diagnosis] DTC troubleshooting completed.
4		No	DTC troubleshooting completed.