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 {5 mph} 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 {5 mph} 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 {5 mph} 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.
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.
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.].)
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].)
No | DTC troubleshooting completed.