Code Definition

B1397 — Power Door Unlock Circuit Short To Battery

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

About B1397

B1397 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 B1397 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) 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.

B1397 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) sets B1397 when it detects an unintended battery voltage on the power door unlock control circuit. The module commands the unlock motors via a driver output and monitors the circuit voltage during both commanded and rest states; an unexpected high signal indicates the unlock circuit is shorted to a positive supply somewhere in the harness or a connected device. Common contributors include chafed body harness wiring contacting a powered conductor, an internally shorted lock actuator, or an aftermarket alarm or central locking installati...

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