Diagnostic Procedure

WARNING:

Handling the component parts improperly can accidentally operate (deploy) the air bag modules, pre-tensioner seat belts and lap pre-tensioner seat belts, which may seriously injure you. Read the service warnings/cautions and the workshop service information before handling the air bag system components. (See AIR BAG SYSTEM SERVICE WARNINGS [TWO-STEP DEPLOYMENT CONTROL SYSTEM - US/CANADA SPEC.] .) (See AIR BAG SYSTEM SERVICE CAUTIONS [TWO-STEP DEPLOYMENT CONTROL SYSTEM - US/CANADA SPEC.] .)

DTC B1128:11/B1128:12/B1128:13/B1128:19/B1128:1A [SAS CONTROL MODULE (TWO-STEP DEPLOYMENT CONTROL SYSTEM - US/CANADA SPEC.)] - DIAGNOSTIC PROCEDURE

Step	Inspection		Action
1	INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE CONNECTOR Switch the ignition off. Disconnect the negative battery terminal and wait for 1 min or more. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .) Remove the driver-side headliner. (See HEADLINER REMOVAL/INSTALLATION .) Disconnect the driver-side curtain air bag module connector. (See CURTAIN AIR BAG MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM - US/CANADA SPEC.] .) Inspect the driver-side curtain air bag module connector (wiring harness-side). (Corrosion, damage, and disconnected pins) Is there any malfunction of the driver-side curtain air bag module connector (wiring harness-side)?	Yes	Replace the malfunctioning part, then go to Step 8.
1		No	Go to the next step.
2	INSPECT DRIVER-SIDE CURTAIN 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 - US/CANADA SPEC.] .) Remove the glove compartment. (See GLOVE COMPARTMENT REMOVAL/INSTALLATION .) Disconnect the passenger-side air bag module connectors. (See PASSENGER-SIDE AIR BAG MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM - US/CANADA SPEC.] .) Disconnect the driver and passenger-side front seat connectors. (See FRONT SEAT REMOVAL/INSTALLATION .) Remove the B-pillar lower trim. (See B-PILLAR LOWER TRIM REMOVAL/INSTALLATION .) Disconnect the driver and passenger-side pre-tensioner seat belt connectors. (See FRONT SEAT BELT REMOVAL/INSTALLATION .) Disconnect the driver and passenger-side lap pre-tensioner seat belt connectors. (See FRONT SEAT BELT REMOVAL/INSTALLATION .) Remove the headliner. (See HEADLINER REMOVAL/INSTALLATION .) Disconnect the passenger-side curtain air bag module connector. (See CURTAIN AIR BAG MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM - US/CANADA SPEC.] .) Disconnect the all SAS control module connectors. (See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM - US/CANADA SPEC.] .) Inspect for continuity between the following terminals (wiring harness-side) and body ground: SAS control module terminal 1U SAS control module terminal 1W NOTE: Inspect for continuity while shaking the wiring harness between the SAS control module and the driver-side curtain 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 driver-side curtain 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 8.
2		No	Go to the next step.
3	INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE CIRCUIT FOR OPEN CIRCUIT Driver-side curtain air bag module and SAS control module connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side): Driver-side curtain air bag module terminal A-SAS control module terminal 1U Driver-side curtain air bag module terminal B-SAS control module terminal 1W NOTE: Inspect for continuity while shaking the wiring harness between the SAS control module and driver-side curtain air bag module. Is there continuity?	Yes	Go to the next step.
3		No	Refer to the wiring diagram and verify whether or not there is a common connector between SAS control module terminal and driver-side curtain 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 8.
4	INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE CIRCUIT FOR SHORT TO EACH OTHER Driver-side curtain air bag module and SAS control module connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side): SAS control module terminal 1U-SAS control module terminal 1W NOTE: Inspect for continuity while shaking the wiring harness between the SAS control module and driver-side curtain 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 driver-side curtain 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 each other. Replace the malfunctioning part. If there is no common connector: Replace the wiring harness which has a short to each other. Go to Step 8.
4		No	Go to the next step.
5	INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE CIRCUIT FOR SHORT TO OTHER AIR BAG MODULE CIRCUITS Driver-side curtain air bag module and SAS control module connectors are disconnected. Other air bag module, pre-tensioner seat belt and lap pre-tensioner seat belt connectors are disconnected. Refer to the wiring diagram and inspect for continuity between the driver-side curtain air bag module terminals and other air bag module/pre-tensioner seat belt/lap pre-tensioner seat belt terminals (wiring harness-side). NOTE: Inspect for continuity while shaking the wiring harness between the SAS control module and driver-side curtain 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 driver-side curtain 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 other air bag module or pre-tensioner seat belt or lap pre-tensioner seat belt circuits. Replace the malfunctioning part. If there is no common connector: Replace the wiring harness which has a short to other air bag module or pre-tensioner seat belt or lap pre-tensioner seat belt circuits. Go to Step 8.
5		No	Go to the next step.
6	INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE CIRCUIT FOR SHORT TO POWER SUPPLY Driver-side curtain air bag module and SAS control module connectors are disconnected. Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .) Switch the ignition ON (engine off or on). Measure the voltage at the following terminals (wiring harness-side): SAS control module terminal 1U SAS control module terminal 1W NOTE: Measure the voltage while shaking the wiring harness between the SAS control module and driver-side curtain air bag module. Is the voltage 0 V?	Yes	Go to the next step.
6		No	Refer to the wiring diagram and verify whether or not there is a common connector between SAS control module terminal and driver-side curtain 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 8.
7	INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE Switch the ignition off. Disconnect the negative battery terminal and wait for 1 min or more. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .) Connect the SAS control module connectors. Except for the driver-side curtain air bag module connector, reconnect all disconnected connectors. Connect the SST (49 N088 0A0) or apply 2 ohms resistance to the driver-side curtain air bag module connector (wiring harness-side) terminals A and B. Set the SST (49 N088 0A0) to 2 ohms. Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL 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 - US/CANADA SPEC.)] .) Perform the DTC inspection for the SAS control module using the M-MDS. (See DTC INSPECTION [SAS CONTROL MODULE (TWO-STEP DEPLOYMENT CONTROL SYSTEM - US/CANADA SPEC.)] .) Are the same DTCs present?	Yes	Go to the next step.
7		No	Replace the driver-side curtain air bag module. (See CURTAIN AIR BAG MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM - US/CANADA SPEC.] .) Then go to the next step.
8	PERFORM SAS CONTROL MODULE DTC INSPECTION Switch the ignition off. Disconnect the negative battery terminal and wait for 1 min or more. Disconnect the SST (49 N088 0A0) or the 2 ohms resistance. Connect the driver-side curtain air bag module connector. Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL 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 - US/CANADA SPEC.)] .) Perform the DTC inspection for the SAS control module using the M-MDS. (See DTC INSPECTION [SAS CONTROL MODULE (TWO-STEP DEPLOYMENT CONTROL SYSTEM - US/CANADA SPEC.)] .) 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 - US/CANADA SPEC.] .)
8		No	DTC troubleshooting completed.