Diagnostic procedure

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

DIAGNOSTIC PROCEDURE - DTC B1877, B1878, B1879, B1885

STEP	INSPECTION		ACTION
1	INSPECT DRIVER-SIDE PRE-TENSIONER SEAT BELT Using the WDS or equivalent, verify the following PID/DATA monitor. (See 08-02B-10 PID/DATA MONITOR TABLE [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) DR_PTENS Is the driver-side pre-tensioner seat belt resistance normal? Resistance: 1.5-3.1 ohms	Yes	[Present malfunction diagnosis] Replace the SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM] .) [Past malfunction diagnosis] DTC troubleshooting completed.
1		No	Go to the next step.
2	INSPECT DRIVER-SIDE PRE-TENSIONER SEAT BELT 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 pre-tensioner seat belt connector. Is there any malfunction of the driver-side pre-tensioner seat belt connector?	Yes	Replace the air bag wiring harness.
2		No	Go to the next step.
3	VERIFY WHETHER MALFUNCTION IS IN DRIVER-SIDE PRE-TENSIONER SEAT BELT OR RELATED WIRING HARNESS Connect the leads of the SST (Fuel and thermometer checker) or apply 2-ohm resistance to driver-side pre-tensioner seat belt 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. Are DTCs B1877, B1878, B1879, and/or B1885 indicated?	Yes	Replace the air bag wiring harness, then go to the next step.
3		No	Replace the driver-side pre-tensioner seat belt. (See FRONT SEAT BELT REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM] .)
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 pre-tensioner seat belt connector. Are DTCs B1877, B1878, B1879, and/or B1885 indicated?	Yes	[Present malfunction diagnosis] Replace the SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM] .) [Past malfunction diagnosis] DTC troubleshooting completed.
4		No	DTC troubleshooting completed.