DTC B1318 [AIR BAG SYSTEM]

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System Malfunction Location

DTC	System Malfunction Location
M-MDS display
B1318	The power supply voltage decreases (less than 9v)

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.

Possible Causes

System Wiring Diagram

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Diagnostic Procedure

STEP	INSPECTION		ACTION
1	BATTERY INSPECTION •  Refer to the battery inspection and inspect the battery. (See BATTERY INSPECTION [L8, LF].) •  Is the battery normal?	Yes	Go to the next step.
		No	Replace or charge the battery. (See BATTERY REMOVAL/INSTALLATION [L8, LF].)
2	FUSE INSPECTION •  Turn the ignition switch to the LOCK position. •  Remove the battery cover. •  Disconnect the negative battery cable and wait for 1 min or more. (See BATTERY REMOVAL/INSTALLATION [L8, LF].) •  Remove the ENGINE 15 A fuse. •  Is the fuse normal?	Yes	Go to the next step.
		No	Replace the ENGINE 15 A fuse.
3	INSPECT SAS CONTROL MODULE CONNECTOR 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.) (See AIR BAG SYSTEM SERVICE CAUTIONS.) •  Remove the console panel. (See CONSOLE PANEL REMOVAL/INSTALLATION.) •  Disconnect all SAS control module connectors. •  Inspect the SAS control module connection. (Corrosion, damage, and disconnected pins) •  Is there any malfunction of the SAS control module connector?	Yes	Replace the SAS control module wiring harness.
		No	Go to the next step.
4	INSPECT WIRING HARNESS BETWEEN IGNITION RELAY AND SAS CONTROL MODULE •  Remove the column cover. (See COLUMN COVER REMOVAL/INSTALLATION.) •  Disconnect the clock spring connector. (See CLOCK SPRING REMOVAL/INSTALLATION.) •  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.) •  Disconnect the driver and passenger-side seat connectors. (See SEAT REMOVAL/INSTALLATION.) •  Remove the back trim. (See BACK TRIM REMOVAL/INSTALLATION.) •  Remove the driver and passenger-side pre-tensioner seat belt connectors. (See SEAT BELT REMOVAL/INSTALLATION.) •  Connect the negative battery cable. •  Turn the ignition switch to the ON position. •  Measure the voltage of SAS control module terminal 1W. Note •  Measure the voltage while shaking the wiring harness between the SAS control module and ignition relay. •  Is the voltage between 9–16 V?	Yes	Go to the next step.
		No	Replace the wiring harness between the ignition relay and SAS control module.
5	INSPECT WIRING HARNESS BETWEEN SAS CONTROL MODULE AND BODY GROUND •  Turn the ignition switch to the LOCK position. •  Disconnect the negative battery cable and wait 1 min or more. •  Inspect the wiring harness between SAS control module connector terminal 1I and body ground. ―  Open circuit Note •  Inspect for continuity while shaking the wiring harness between the SAS control module and body ground. •  Is the wiring harness normal?	Yes	Go to the next step.
		No	Replace the wiring harness between the SAS control module and body ground.
6	PERFORM SAS CONTROL MODULE DTC INSPECTION •  Reconnect all disconnected connectors. •  Connect the negative battery cable. •  Turn the ignition switch to the ON position. •  Clear the DTC for the SAS control module using the M-MDS. (See CLEARING DTC [AIR BAG SYSTEM].) •  Perform the DTC inspection for the SAS control module using the M-MDS. (See DTC INSPECTION [AIR BAG SYSTEM].) •  Are the same DTCs present?	Yes	Replace the SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
		No	DTC troubleshooting completed.