Code Definition

B1372 — Illuminated Entry Relay Circuit Open

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

About B1372

B1372 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 B1372 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.

B1372 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 illuminated entry system uses a relay, controlled by the Body Control Module (BCM), to switch power to the interior courtesy and map lights when the vehicle is unlocked, when a door is opened, or when the keyless entry remote is operated. DTC B1372 sets specifically when the BCM detects an open circuit on the relay control or feedback line, meaning current flow is absent when the relay should be commanded to operate. The BCM verifies circuit integrity by monitoring the voltage on the relay drive line and identifies an open as a high impedance state with no current draw. Symptoms typically ...

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