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 B2438, B2439, B2692 DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	INSPECT PASSENGER-SIDE BUCKLE SWITCH CIRCUIT Using the WDS or equivalent, verify the following PID/DATA monitor. (See PID/DATA MONITOR TABLE ) PS_BUKL Is the passenger-side buckle switch normal?	Yes	Present malfunction diagnosis: Replace SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION .) Past malfunction diagnosis: DTC troubleshooting completed.
1		No	Go to the next step.
2	INSPECT PASSENGER-SIDE BUCKLE MODULE Turn the ignition switch to the LOCK position. Disconnect the negative battery cable and wait for 1 min or more. Remove the passenger-side front buckle. Inspect the passenger-side front buckle switch. (See FRONT BUCKLE SWITCH INSPECTION .) Is the passenger-side front buckle switch normal?	Yes	Go to the next step.
2		No	Replace the passenger-side front buckle. (See FRONT BUCKLE REMOVAL/INSTALLATION .)
3	INSPECT WIRING HARNESS BETWEEN PASSENGER-SIDE BUCKLE SWITCH AND GROUND Inspect the wiring harness between passenger-side front buckle switch terminal H and ground for the following: Short to power supply Open circuit Is the wiring harness normal?	Yes	Go to the next step.
3		No	Replace the wiring harness.
4	INSPECT WIRING HARNESS BETWEEN PASSENGER-SIDE BUCKLE SWITCH AND SAS CONTROL MODULE 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. Remove the column cover. Disconnect the clock spring connector. Remove the glove compartment. Disconnect the passenger-side air bag module connector. Disconnect the driver and passenger-side side air bag module connectors. Disconnect the driver and passenger-side curtain air bag module connectors. Remove the rear door lower trim. Disconnect the driver and passenger-side pre-tensioner seat belt connectors. Partially peel back the floor covering. Disconnect the SAS control module connector. Inspect the wiring harness between SAS control module terminal 2H and passenger-side front buckle switch terminal G for the following: Short to ground Short to power supply Open circuit Is the wiring harness normal?	Yes	[Present malfunction diagnosis] Replace the SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION .) [Past malfunction diagnosis] DTC troubleshooting completed.
4		No	Replace the wiring harness.