Code Definition

B1371 — Illuminated Entry Relay Circuit Failure

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

About B1371

B1371 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 B1371 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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.

B1371 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 dedicated relay, controlled by the Body Control Module (BCM), to energize the interior courtesy and map lights when the vehicle is unlocked, when a door is opened, or when the keyless entry remote is activated. DTC B1371 sets when the BCM detects an electrical fault on the relay control circuit, including an open circuit, short to ground, short to battery voltage, or excessive current draw on the relay coil drive line. The BCM monitors the relay coil feedback to confirm commanded operation matches actual circuit response, and a mismatch triggers this code. S...

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