Code Definition

B1431 — Wiper Brake/Run Relay Circuit Failure

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

About B1431

B1431 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 B1431 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.

B1431 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 monitors the wiper brake/run relay circuit, which switches the high current feed to the windshield wiper motor for both the run and park functions. DTC B1431 sets when the module detects an electrical fault in this relay control or feed circuit, such as an open circuit, excessive resistance, a short to ground or power, or an internal coil or contact fault within the relay itself. The wiper motor relies on this relay to engage the appropriate motor brushes for low and high speed operation and to provide the brake function that returns the wipers to the park position when...

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