DTC B1317, B1318

id080200811500

DTC

B1317

SAS control module power supply voltage increases (18.1 V or more)

B1318

SAS control module power supply voltage decreases (less than 8 V)
DETECTION CONDITION
Warning
•  Detection conditions are for understanding the DTC outline before performing an inspection. Performing an inspection with only detection conditions may cause injury due to an operating error, or damage the system. When performing an inspection, always follow the inspection procedure.
•  When the SAS control module power supply voltage is not within 8―18 V.
POSSIBLE CAUSE
•  Open or short circuit in wiring harness between battery and SAS control module
•  SAS 7.5 A fuse malfunction
•  Battery malfunction
•  SAS control module malfunction

Diagnostic procedure

Step

Inspection

Action
1
INSPECT FUSE
•  Remove the SAS 7.5 A fuse.
•  Is the fuse normal?
Yes
Go to the next step.
No
Replace the fuse.
2
INSPECT BATTERY
•  Measure the battery positive voltage.
•  Is the voltage 8 V―18 V?
Yes
Go to the next step.
No
The battery has a malfunction.
Inspect the charge/discharge system.
3
INSPECT WIRING HARNESS BETWEEN BATTERY AND FUSE BLOCK
•  Turn the ignition switch to the ON position.
•  Measure the fuse block terminal H voltage.
•  Is the voltage 8 V―18 V?
Yes
Install the fuse, then go to the next step.
No
Repair the wiring harness between the battery and fuse block.
4
INSPECT SAS CONTROL MODULE
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 service warnings before handling the air bag system components.
•  Turn the ignition switch to the LOCK position.
•  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 COMBINATION SWITCH 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 front seat connectors. (See FRONT SEAT REMOVAL/INSTALLATION.)
•  Disconnect the driver and passenger-side curtain air bag module connectors. (See CURTAIN AIR BAG MODULE REMOVAL/INSTALLATION.)
•  Remove the B-pillar lower trim. (See B-PILLAR LOWER TRIM REMOVAL/INSTALLATION.)
•  Disconnect the driver and passenger-side pre-tensioner seat belt connectors. (See FRONT SEAT BELT REMOVAL/INSTALLATION.)
•  Disconnect the SAS control module connectors. (See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
•  Connect the negative battery cable.
•  Turn the ignition switch to the ON position.
•  Measure the voltage at the SAS control module terminal 1D.
Note
•  Measure the voltage while shaking the wiring harness between the fuse block and SAS control module.
•  Is the voltage 8 V―18 V?
Yes
Go to the next step.
No
Repair the wiring harness between the fuse block and SAS control module.
6
INSPECT DTCs
•  Clear DTCs using the M-MDS.
(See CLEARING DTC.)
•  Verify DTCs using the M-MDS.
(See DTC DISPLAY.)
•  Is DTC B1317, B1318 displayed again?
•  Are there other DTCs output?
Yes
Replace the SAS control module.
(See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
No
DTC troubleshooting completed.