Code Definition

B1393 — Power Door Memory Lock Relay Circuit Open

System: Body  |  Type: Manufacturer-Specific  |  Make: Generic

About B1393

B1393 is a manufacturer-specific body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1393 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B1393 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Body Control Module (BCM) or Door Control Module (DCM) controls the power door memory lock relay to operate the door lock actuators as part of the keyless entry, speed sensitive auto lock, or driver memory recall functions. DTC B1393 sets specifically when the module detects a complete open circuit on the relay control or feedback line, meaning current will not flow through the coil or there is a break somewhere in the load path. This is distinct from short circuit or generic relay failure codes in the same family because the module is reporting a complete loss of continuity rather than a ...

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