DTC B1317, B1318 [DSC/RSC]

id0402b3800300

Note

• DTC B1317 is output when the battery voltage is 16 V or more. If DTC B1317 is output, inspect the battery and charging system for a malfunction before performing the malfunction diagnosis.

DTC

B1317, B1318

Power supply system

DETECTION CONDITION

•  B1317

―  DSC/RSC HU/CM terminal X voltage of 16 V or more continues for 3 s while driving at a vehicle speed of 8 km/h or more.

―  DSC/CM terminal X voltage of 18.5 V or more continues for 15 ms while driving at a vehicle speed of 8 km/h or more.

•  B1318

―  DSC/RSC HU/CM terminal X voltage of 10 V or less continues for 3 s while driving at a vehicle speed of 8 km/h or more.

POSSIBLE CAUSE

•  SAS 7.5A fuse malfunction

•  Open circuit or short to ground in the wiring harness between the DSC/RSC HU/CM terminal X and the battery

•  Open circuit or faulty ground in the wiring harness between the DSC/RSC HU/CM terminal A and the body ground

•  Battery deterioration

•  Generator malfunction

•  DSC/RSC HU/CM malfunction

•  Poor connection at connectors (female terminal)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	INSPECT DSC/RSC HU/CM POWER SUPPLY FOR OPEN CIRCUIT • Start the engine. • Measure the voltage between DSC/RSC HU/CM terminal X and ground. • Is the voltage approx. 10 V?	Yes	Go to the next step.
1		No	Repair or replace the wiring harness for open circuit between the DSC/RSC HU/CM and ground, then go to Step 3.
2	INSPECT DSC/RSC HU/CM GROUND FOR POOR GROUND OR OPEN CIRCUIT • Turn the ignition switch off. • Measure the resistance between ground and DSC/RSC HU/CM terminal A. • Is the resistance within 0—1 ohm?	Yes	Go to the next step.
2		No	If there is no continuity: • Repair or replace the wiring harness for open circuit between the DSC/RSC HU/CM and ground, then go to the next step. If the resistance is not within 0—1 ohm: • Repair or replace the wiring harness for poor ground, then go to the next step.
3	VERIFY TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the memory. (See ON-BOARD DIAGNOSIS [DSC/RSC].) • Is the same DTC present?	Yes	Replace the DSC/RSC HU/CM, then go to the next step. (See DSC/RSC HU/CM REMOVAL/INSTALLATION [L.H.D.].) (See DSC/RSC HU/CM REMOVAL/INSTALLATION [R.H.D.].)
3		No	Go to the next step.
4	VERIFY AFTER REPAIR PROCEDURE • Are any other DTCs present?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [DSC/RSC].)
4		No	DTC troubleshooting completed.

DTC	B1317, B1318		Power supply system
DETECTION CONDITION		• B1317 ― DSC/RSC HU/CM terminal X voltage of 16 V or more continues for 3 s while driving at a vehicle speed of 8 km/h or more. ― DSC/CM terminal X voltage of 18.5 V or more continues for 15 ms while driving at a vehicle speed of 8 km/h or more. • B1318 ― DSC/RSC HU/CM terminal X voltage of 10 V or less continues for 3 s while driving at a vehicle speed of 8 km/h or more.
POSSIBLE CAUSE		• SAS 7.5A fuse malfunction • Open circuit or short to ground in the wiring harness between the DSC/RSC HU/CM terminal X and the battery • Open circuit or faulty ground in the wiring harness between the DSC/RSC HU/CM terminal A and the body ground • Battery deterioration • Generator malfunction • DSC/RSC HU/CM malfunction • Poor connection at connectors (female terminal)