System malfunction location

• DSC HU/CM communication fault

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.

• Communication error between SAS control module and DSC HU/CM

Fail-safe

Not applicable

Possible cause

• DSC HU/CM connector malfunction

• SAS control module connector malfunction

• Short circuit to power supply or body ground in wiring harness between SAS control module and DSC HU/CM

• Open circuit in wiring harness between SAS control module and DSC HU/CM

• DSC HU/CM connector malfunction

• SAS control module malfunction

STEP

INSPECTION

ACTION

1

• 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].)

• Disconnect the DSC HU/CM connector. (See DSC HU/CM REMOVAL/INSTALLATION.)

• Inspect the DSC HU/CM connector terminals for poor connection (such as damaged/pulled-out pins, and corrosion).

• Is there any malfunction?

Yes

Replace the malfunctioning part, then go to next step.

No

Go to the next step.

2

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 [STANDARD DEPLOYMENT CONTROL SYSTEM].) (See AIR BAG SYSTEM SERVICE CAUTIONS [STANDARD DEPLOYMENT CONTROL SYSTEM].)

• Remove the column cover. (See COLUMN COVER REMOVAL/INSTALLATION.)

• Disconnect the clock spring connector. (See CLOCK SPRING REMOVAL/INSTALLATION [STANDARD 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 [STANDARD DEPLOYMENT CONTROL SYSTEM].)

• Disconnect the driver and passenger-side front seat connector. (See FRONT SEAT REMOVAL/INSTALLATION.)

• Remove the headliner. (See HEADLINER REMOVAL/INSTALLATION.)

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

• Inspect the SAS control module connector terminal for poor connection (such as damaged/pulled-out pins, and corrosion).

• Is there any malfunction?

Yes

Replace the terminal, then go to next step.

No

Go to the next step.

3

• DSC HU/CM and SAS control module connectors are disconnected.

• Inspect for continuity between the following terminals (wiring harness-side) and body ground:

• SAS control module terminal 3H

• SAS control module terminal 3I

NOTE:

• Inspect for continuity while shaking the wiring harness between the SAS control module and DSC HU/CM.

• 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 DSC HU/CM 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.

4

• DSC HU/CM and SAS control module connectors are disconnected.

• Inspect for continuity between the following terminals (wiring harness-side):

• DSC HU/CM terminal G—SAS control module terminal 3H

• DSC HU/CM terminal F—SAS control module terminal 3I

NOTE:

• Inspect for continuity while shaking the wiring harness between the SAS control module and DSC HU/CM.

• 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 DSC HU/CM 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.

5

• DSC HU/CM 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 3H

• SAS control module terminal 3I

NOTE:

• Measure the voltage while shaking the wiring harness between the SAS control module and DSC HU/CM.

• Is the voltage 0 V?

Yes

Replace the DSC HU/CM, then go to the next step. (See DSC HU/CM REMOVAL/INSTALLATION.)

No

Refer to the wiring diagram and verify whether or not there is a common connector between SAS control module terminal and DSC HU/CM 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 the next step.

6

• Switch the ignition off.

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

• Connect the SAS control module connectors.

• Reconnect all disconnected connectors.

• 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 [STANDARD DEPLOYMENT CONTROL SYSTEM].)

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

• Are the same DTCs present?

Yes

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

No

DTC troubleshooting completed.