System malfunction location

• B1128:11:Driver-side curtain air bag module circuit short to body ground

• B1128:12:Driver-side curtain air bag module circuit short to power supply

• B1128:13:Driver-side curtain air bag module circuit open circuit or resistance high

• B1128:19:Short circuit to driver-side curtain air bag module and other air bag module circuits

• B1128:1A:Driver-side curtain 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 0.81—6.42 ohms detected in driver-side curtain air bag module circuit

• Wiring harness between the driver-side curtain air bag module and SAS control module has a malfunction

Fail-safe

Not applicable

Possible cause

• Driver-side curtain air bag module connector malfunction

• Short circuit to power supply or body ground in the wiring harness between the driver-side curtain air bag module and SAS control module

• Open circuit in the wiring harness between the driver-side curtain air bag module and SAS control module

• Driver-side curtain air bag module malfunction

• SAS control module malfunction

Step

Inspection

Action

1

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 off.

• Disconnect the negative battery cable and wait for 1 min or more. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].)

• Remove the 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].)

• Inspect the driver-side curtain air bag module connector. (Corrosion, damage, and disconnected pins)

• Is there any malfunction of the driver-side curtain air bag module connector?

Yes

Replace the malfunctioning part, then go to Step 6.

No

Go to the next step.

2

• 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 glove compartment. (See GLOVE COMPARTMENT 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 and passenger-side front seat connector. (See FRONT SEAT REMOVAL/INSTALLATION.)

• Disconnect the passenger-side curtain air bag module connector. (See CURTAIN AIR BAG MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)

• Remove the B-pillar lower trim. (See B-PILLAR LOWER TRIM REMOVAL/INSTALLATION.)

• Disconnect the driver and passenger-side pre-tensioner seat belt connectors.

• Disconnect the driver and passenger-side lap pre-tensioner seat belt connectors. (See FRONT SEAT BELT REMOVAL/INSTALLATION.)

• Remove the rear console. (See REAR CONSOLE 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 1S

• SAS control module terminal 1V

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 6.

No

Go to the next step.

3

• 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 1S

• Driver-side curtain air bag module terminal B—SAS control module terminal 1V

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.

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 6.

4

• Driver-side curtain air bag module and SAS control module connectors are disconnected.

• Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].)

• Switch the ignition ON (engine off or on).

• Measure the voltage at the following terminals (wiring harness-side):

• SAS control module terminal 1S

• SAS control module terminal 1V

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.

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 6.

5

• Switch the ignition off.

• Disconnect the negative battery cable and wait for 1 min or more.

• Connect the SAS control module connectors.

• Except for the driver-side curtain air bag module connector, reconnect all disconnected connectors.

• Connect the SST (Fuel and thermometer checker) or apply 2 ohms resistance to the driver-side curtain air bag module connector terminals A and B.

• Set the SST (Fuel and thermometer checker) to 2 ohms.

• Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].)

• Switch the ignition ON (engine off or on).

• Clear the DTC for the SAS control module using the M-MDS. (See CLEARING DTC [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)

• Perform the DTC inspection for the SAS control module using the M-MDS. (See DTC INSPECTION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)

• Are the same DTCs present?

Yes

Go to the next step.

No

Replace the driver-side curtain air bag module. (See CURTAIN AIR BAG MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)

Then go to the next step.

6

• Switch the ignition off.

• Disconnect the negative battery cable and wait for 1 min or more.

• Disconnect the SST (Fuel and thermometer checker) or the 2 ohms resistance.

• Connect the driver-side curtain air bag module connector.

• Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].)

• Switch the ignition ON (engine off or on).

• Clear the DTC for the SAS control module using the M-MDS. (See CLEARING DTC [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)

• Perform the DTC inspection for the SAS control module using the M-MDS. (See DTC INSPECTION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)

• Are the same DTCs present?

Yes

Replace the SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)

No

DTC troubleshooting completed.