2

Air bag system warning light illuminates constantly

DETECTION CONDITION

Air bag system warning light is illuminated constantly and remains illuminated after 6 s have elapsed.

POSSIBLE CAUSE

• Weak battery

• SAS control module malfunction

• SAS control module connectors are poorly connected

• Instrument cluster malfunction

• Instrument cluster connector is poorly connected

• Open or short to power supply circuit in wiring harness between instrument cluster and SAS control module

STEP

INSPECTION

ACTION

1

• Measure the voltage of battery.

• Is the voltage 8 V or more?

Yes

Go to the next step.

No

Battery is weak.

Inspect charge/discharge system, then go to Step 8. (See BATTERY INSPECTION [SKYACTIV-G 2.5].)

2

WARNING:

• Handling the air bag system components improperly can accidentally deploy the air bag modules and pre-tensioner seat belts, which may seriously injure you. Read the air bag system service warnings and cautions 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].)

  (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 rear console. (See REAR CONSOLE REMOVAL/INSTALLATION.)

• Are all SAS control module connectors securely connected?

Yes

Go to the next step.

No

Reconnect the connector properly, then go to Step 8.

3

• Clear DTCs using the M-MDS. (See CLEARING DTC [STANDARD DEPLOYMENT CONTROL SYSTEM].) (See CLEARING DTC [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)

• Inspect the DTC for the SAS control module on-board diagnostic system.

• Have DTCs been recorded in memory?

Yes

Perform the applicable DTC inspection, then go to Step 8.

(See DTC TABLE [STANDARD DEPLOYMENT CONTROL SYSTEM].) (See DTC TABLE [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)

No

Go to the next step.

4

• Inspect the DTC for the instrument cluster on-board diagnostic system.

• Have DTCs been recorded in memory?

Yes

Perform the applicable DTC inspection, then go to Step 8. (See DTC TABLE [INSTRUMENT CLUSTER].)

No

Go to the next step.

5

• Turn on all warning lights and indicator lights using the instrument cluster PID WL+IL of simulation function using the M-MDS. (See ACTIVE COMMAND MODES INSPECTION [INSTRUMENT CLUSTER].)

• Do other warning and indicator lights illuminate?

Yes

Go to the next step.

No

Repair the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

Then go to Step 8.

6

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].)(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.

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

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

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

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

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 IG1 relay 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.

6

• Disconnect all SAS control module connectors. (See SAS CONTROL MODULE REMOVAL/INSTALLATION [STANDARD DEPLOYMENT CONTROL SYSTEM].) (See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)

• 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 SAS control module at wiring harness-side connector terminal 3C.

• Is the voltage 8 V—16 V?

7

• SAS control module connector disconnected.

• 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].)

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

• SAS control module terminal 2C—body ground

• SAS control module terminal 2F—body ground

NOTE:

• Inspect for continuity while shaking the wiring harness between the SAS control module and body ground.

• Is there continuity?

Yes

Replace the SAS control module, then go to the next step.

(See SAS CONTROL MODULE REMOVAL/INSTALLATION [STANDARD DEPLOYMENT CONTROL SYSTEM].)

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

No

Refer to the wiring diagram and verify whether or not there is a common connector between SAS control module terminal 2C, 2F and body ground.

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 the next step.

8

• 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).

• Does the air bag system warning light illuminate for approx. 6 s and turn off?

Yes

Complete troubleshooting, then explain repairs to customer.

No

Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.