Renault B1318 <1000+ TOP>

Definition: B1318 - Driver’s Door Lock Switch Circuit Malfunction

In the vast majority of Renault vehicles (including the Megane III, Fluence, Scenic III, and Dacia Logan/Sandero), the B1318 code specifically points to a problem with the electrical circuit of the driver’s side door lock/unlock switch. renault b1318

This switch is typically located on the driver’s door armrest or the center console, depending on the model. It is responsible for sending a signal to the UCH (Unité Centrale Habitacle) —the "body control module" or "convenience unit" that controls central locking, windows, lights, and immobilizer functions. Definition: B1318 - Driver’s Door Lock Switch Circuit

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 B1318 code. When the UCH detects an abnormal voltage, resistance,

With the switch removed:

There is no reset, calibration, or coding that will clear a true B1318 internal fault. The solutions are: