For vehicles under the B1318 project code, several technical and structural features are highlighted in official documentation:
: An electrical component staying on when the car is off can drain the battery overnight. Recommended Troubleshooting renault b1318
When the UCH detects an abnormal voltage, resistance, or signal pattern from the physical door lock switch circuit—either because the switch is stuck, the wiring is damaged, or there’s a short circuit—it logs the code. For vehicles under the B1318 project code, several
: A faulty alternator or voltage regulator failing to maintain the necessary 13.8–14.4V while the engine is running. the wiring is damaged