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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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DTC B00A0:81/B00A0:87 [SAS CONTROL MODULE (TWO-STEP DEPLOYMENT CONTROL SYSTEM)]

System malfunction location	B00A0:81:Occupant classification sensor memory check sum error B00A0:87:Communication error with occupant classification sensor
Detection condition	WARNING: Detection conditions are for understanding the DTC outline before performing an inspection. Performing an inspection according to only the detection conditions may cause injury due to an operating error, or damage the system. When performing an inspection, always follow the inspection procedure. Error signal is detected between SAS control module and occupant classification sensor
Fail-safe	—
Possible cause	Occupant classification sensor connector malfunction Open circuit in wiring harness between occupant classification sensor and SAS control module Short to power supply in wiring harness between the SAS control module and occupant classification sensor Short to ground in wiring harness between the SAS control module and occupant classification sensor Occupant classification sensor malfunction SAS control module malfunction

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT OCCUPANT CLASSIFICATION SENSOR CONNECTOR WARNING: Handling the component parts improperly can accidentally operate (deploy) the air bag module, which may seriously injure you. Read the service warnings/cautions and the workshop manual before handling the air bag system components. (See AIR BAG SYSTEM SERVICE WARNINGS [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) (See AIR BAG SYSTEM SERVICE CAUTIONS [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) Switch the ignition to off. Disconnect the negative battery cable and wait for 1 min or more. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Disconnect the occupant classification sensor connector. (See OCCUPANT CLASSIFICATION SENSOR REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) Is there any malfunction of the occupant classification sensor connector or seat connector?	Yes	Replace the malfunctioning part, then go to Step 5.
		No	Go to the next step.
2	INSPECT OCCUPANT CLASSIFICATION SENSOR CIRCUIT FOR SHORT TO GROUND Occupant classification sensor and fuse block connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side): SAS control module connector terminal 3S SAS control module connector terminal 3Q NOTE: Inspect for continuity while shaking the wiring harness between the SAS control module and occupant classification sensor. Is there continuity?	Yes	Replace the wiring harness for a possible short to ground, then go to Step 5.
		No	Go to the next step.
3	INSPECT OCCUPANT CLASSIFICATION SENSOR CIRCUIT FOR OPEN CIRCUIT Occupant classification sensor and fuse block connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side): Occupant classification sensor terminal 4A—SAS control module connector terminal 3S Occupant classification sensor terminal 4B—SAS control module connector terminal 3Q NOTE: Inspect for continuity while shaking the wiring harness between the SAS control module and occupant classification sensor. Is there continuity?	Yes	Go to the next step.
		No	Replace the wiring harness for a possible open circuit, then go to Step 5.
4	INSPECT OCCUPANT CLASSIFICATION SENSOR CIRCUIT FOR SHORT TO POWER SUPPLY Occupant classification sensor and fuse block connectors are disconnected. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Switch the ignition ON (engine off or on). Measure the voltage at the following terminals (wiring harness-side): SAS control module connector terminal 3S SAS control module connector terminal 3Q NOTE: Measure the voltage while shaking the wiring harness between the SAS control module and occupant classification sensor. Is the voltage 0V?	Yes	Go to the next step.
		No	Replace the wiring harness for a possible short to power supply, then go to the next step.
5	INSPECT OCCUPANT CLASSIFICATION SENSOR Inspect the occupant classification sensor. (See OCCUPANT CLASSIFICATION SENSOR INSPECTION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) Is the voltage of each terminal normal?	Yes	Go to the next step.
		No	Repair or replace the wiring harness or connector, then go to the next step.
6	PERFORM SAS CONTROL MODULE DTC INSPECTION Reconnect the disconnected connectors. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Switch the ignition ON (engine off or on). Clear the DTC for the SAS control module using the M-MDS. (See CLEARING DTC [SAS CONTROL MODULE (TWO-STEP DEPLOYMENT CONTROL SYSTEM)].) Perform the DTC inspection for the SAS control module using the M-MDS. (See DTC INSPECTION [SAS CONTROL MODULE (TWO-STEP DEPLOYMENT CONTROL SYSTEM)].) Are DTCs B00A0:81, B00A0:87 displayed?	Yes	Replace the occupant classification sensor. (See OCCUPANT CLASSIFICATION SENSOR REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) Then go to the next step.
		No	DTC troubleshooting completed.
7	VERIFY TROUBLESHOOTING COMPLETED Clear DTCs using the M-MDS. (See CLEARING DTC [SAS CONTROL MODULE (TWO-STEP DEPLOYMENT CONTROL SYSTEM)].) Verify DTCs using the M-MDS. (See DTC INSPECTION [SAS CONTROL MODULE (TWO-STEP DEPLOYMENT CONTROL SYSTEM)].) Are DTCs B00A0:81, B00A0:87 displayed?	Yes	Replace the SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)
		No	DTC troubleshooting completed.

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