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

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DTC B1127:11/B1127:12/B1127:13/B1127:19/B1127:1A [SAS CONTROL MODULE (TWO-STEP DEPLOYMENT CONTROL SYSTEM)]

System malfunction location	B1127:11: Passenger-side side air bag module circuit short to body ground B1127:12: Passenger-side side air bag module circuit short to power supply B1127:13: Passenger-side side air bag module circuit open circuit or resistance high B1127:19: Short circuit to passenger-side side air bag module and other air bag module circuits B1127:1A: Passenger-side side air bag module circuit resistance low
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. Resistance other than 0.88–10.53 ohms detected in passenger-side side air bag module circuit Wiring harness between the passenger-side side air bag module and SAS control module has a malfunction
Fail-safe function	Not applicable
Possible cause	Passenger-side side air bag module connector malfunction Short circuit to power supply or body ground in the wiring harness between the passenger-side side air bag module and SAS control module Open circuit in the wiring harness between the passenger-side side air bag module and SAS control module Passenger-side side air bag module malfunction SAS control module malfunction

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT PASSENGER-SIDE SIDE AIR BAG MODULE CONNECTOR WARNING: Handling the component parts improperly can accidentally operate (deploy) the air bag modules and pre-tensioner seat belts, 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 off. Disconnect the negative battery cable and wait for 1 min or more. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Disconnect the passenger-side side air bag module connector installed to the lower side of the seat cushion of the seat. (See SEAT REMOVAL/INSTALLATION.) Inspect the passenger-side side air bag module connector. (Corrosion, damage, and disconnected pins) Is there any malfunction of the passenger-side side air bag module connector?	Yes	Replace the malfunctioning part, then go to Step 6.
		No	Go to the next step.
2	INSPECT PASSENGER-SIDE SIDE AIR BAG MODULE CIRCUIT FOR SHORT TO GROUND Remove the column cover. (See COLUMN COVER REMOVAL/INSTALLATION.) Disconnect the clock spring connector. (See CLOCK SPRING REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) Remove the passenger-side lower panel. (See PASSENGER-SIDE LOWER PANEL REMOVAL/INSTALLATION.) Disconnect the passenger-side air bag module connector. (See PASSENGER-SIDE AIR BAG MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) Disconnect the driver-side seat connector. (See SEAT REMOVAL/INSTALLATION.) Remove the back trim. (See BACK TRIM REMOVAL/INSTALLATION.) Disconnect the driver and passenger-side pre-tensioner seat belt connectors. (See SEAT BELT REMOVAL/INSTALLATION.) Disconnect the driver and passenger-side lap pre-tensioner seat belt connectors. (See SEAT BELT REMOVAL/INSTALLATION.) Disconnect the all SAS control module connectors. (See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) Inspect for continuity between the following terminals (wiring harness-side) and body ground: SAS control module terminal 1K SAS control module terminal 1N NOTE: Inspect for continuity while shaking the wiring harness between the SAS control module and the passenger-side side air bag module. Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between SAS control module terminal and passenger-side side air bag module terminal. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. Replace the malfunctioning part. If there is no common connector: Replace the wiring harness which has a short to ground. Go to Step 6.
		No	Go to the next step.
3	INSPECT PASSENGER-SIDE SIDE AIR BAG MODULE CIRCUIT FOR OPEN CIRCUIT Passenger-side side air bag module and SAS control module connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side): Passenger-side side air bag module terminal 1A—SAS control module terminal 1K Passenger-side side air bag module terminal 1B—SAS control module terminal 1N NOTE: Inspect for continuity while shaking the wiring harness between the SAS control module and passenger-side side air bag module. Is there continuity?	Yes	Go to the next step.
		No	Refer to the wiring diagram and verify whether or not there is a common connector between SAS control module terminal and passenger-side side air bag module terminal. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. Replace the malfunctioning part. If there is no common connector: Replace the wiring harness which has an open circuit. Go to Step 6.
4	INSPECT PASSENGER-SIDE SIDE AIR BAG MODULE CIRCUIT FOR SHORT TO POWER SUPPLY Passenger-side side air bag module and SAS control module 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 terminal 1K SAS control module terminal 1N NOTE: Measure the voltage while shaking the wiring harness between the SAS control module and passenger-side side air bag module. Is the voltage 0 V?	Yes	Go to the next step.
		No	Refer to the wiring diagram and verify whether or not there is a common connector between SAS control module terminal and passenger-side side air bag module terminal. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. Replace the malfunctioning part. If there is no common connector: Replace the wiring harness which has a short to power supply. Go to Step 6.
5	INSPECT PASSENGER-SIDE SIDE AIR BAG MODULE Switch the ignition off. Disconnect the negative battery cable and wait for 1 min or more. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Connect the SAS control module connectors. Except for the passenger-side side air bag module connector, reconnect all disconnected connectors. Connect the SST (Fuel and thermometer checker) or apply 2 ohms resistance to the passenger-side side air bag module connector terminals 1A and 1B. Set the SST (Fuel and thermometer checker) to 2 ohms. 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 the same DTCs present?	Yes	Go to the next step.
		No	Replace the passenger-side side air bag module. (See SIDE AIR BAG MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) Then go to the next step.
6	PERFORM SAS CONTROL MODULE DTC INSPECTION Switch the ignition off. Disconnect the negative battery cable and wait for 1 min or more. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Disconnect the SST (Fuel and thermometer checker) or the 2 ohms resistance. Connect the passenger-side side air bag module connector. 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 the same DTCs present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)
		No	DTC troubleshooting completed.

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