DTC B1317, B1318 [TYPE B]

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System Malfunction Location

DTC	System Malfunction Location
M-MDS display
B1317	SAS control module power supply voltage increases (16 V or more)
B1318	SAS control module power supply voltage decreases (8 V or less)

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 [LF, L5].) (See BATTERY INSPECTION [ZY, Z6].) (See BATTERY INSPECTION [L3 Turbo].) (See BATTERY INSPECTION [MZR-CD 2.2].) (See BATTERY INSPECTION [MZR 2.0 DISI i-stop].) (See BATTERY INSPECTION [MZ-CD 1.6 (Y6)].) •  Is the battery normal?	Yes	Go to the next step.
		No	Replace or charge the battery. (See BATTERY RECHARGING [LF, L5].) (See BATTERY RECHARGING [ZY, Z6].) (See BATTERY RECHARGING [L3 Turbo].) (See BATTERY RECHARGING [MZR-CD 2.2].) (See BATTERY RECHARGING [MZR 2.0 DISI i-stop].) (See BATTERY RECHARGING [MZ-CD 1.6 (Y6)].) (See BATTERY REMOVAL/INSTALLATION [LF, L5].) (See BATTERY REMOVAL/INSTALLATION [ZY, Z6].) (See BATTERY REMOVAL/INSTALLATION [L3 Turbo].) (See BATTERY REMOVAL/INSTALLATION [MZR-CD 2.2].) (See BATTERY REMOVAL/INSTALLATION [MZR 2.0 DISI i-stop].) (See BATTERY RECHARGING [MZ-CD 1.6 (Y6)].)
2	FUSE INSPECTION •  Switch the ignition to off. •  Disconnect the negative battery cable and wait 1 min or more. •  Remove the SAS 15 A fuse. •  Is the fuse normal?	Yes	Go to the next step.
		No	Replace the SAS 15 A fuse.
3	INSPECT WIRING HARNESS BETWEEN SAS CONTROL MODULE AND IG RELAY/IGNITION SWITCH 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 column cover. (See COLUMN COVER REMOVAL/INSTALLATION.) •  Disconnect the clock spring connector. •  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 front seat connector. (See FRONT SEAT REMOVAL/INSTALLATION.) •  Remove the C-pillar trim. (See C-PILLAR TRIM REMOVAL/INSTALLATION.) •  Disconnect the driver and passenger-side curtain air bag module connector (harness side). (See CURTAIN AIR BAG MODULE REMOVAL/INSTALLATION.) •  Remove the B-pillar lower trim. (See B-PILLAR LOWER TRIM REMOVAL/INSTALLATION.) •  Disconnect the lap pre-tensioner seat belt connector. (See FRONT SEAT BELT REMOVAL/INSTALLATION.) •  Disconnect the driver and passenger-side pre-tensioner seat belt connector. (See FRONT SEAT BELT REMOVAL/INSTALLATION.) •  Remove the console. (See CONSOLE REMOVAL/INSTALLATION.) •  Disconnect all SAS control module connectors. (See SAS CONTROL MODULE REMOVAL/INSTALLATION.) •  Connect the negative battery cable. •  Switch the ignition to ON. •  Measure the voltage of SAS control module connector terminal 1D. Note •  Measure the voltage while shaking the wiring harness between the SAS control module and IG relay/ignition switch. •  Is the voltage 8.1–15.9 V?	Yes	Go to the next step.
		No	Replace the wiring harness between the SAS control module and the IG relay/ignition switch.
4	INSPECT WIRING HARNESS BETWEEN SAS CONTROL MODULE AND BODY GROUND •  Switch the ignition to off. •  Disconnect the negative battery cable and wait 1 min or more. •  Inspect the wiring harness between SAS control module connector terminal 1K and body ground. 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.
5	PERFORM SAS CONTROL MODULE DTC INSPECTION •  Reconnect all disconnected connectors. •  Connect the negative battery cable. •  Switch the ignition to ON. •  Clear the DTC for the SAS control module using the M-MDS. (See CLEARING DTC [TYPE B].) •  Perform the DTC inspection for the SAS control module using the M-MDS. (See DTC INSPECTION [TYPE B].) •  Are the same DTCs present?	Yes	Replace the SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
		No	DTC troubleshooting completed.