Code Definition

B1897 — Horn Switch Circuit Failure

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

About B1897

B1897 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 B1897 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.

B1897 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) monitors the horn switch input from the steering wheel horn pad through the clockspring assembly. DTC B1897 is set when the BCM detects an electrical failure on the horn switch circuit, such as a stuck closed input that signals a continuously pressed horn switch, a circuit that does not respond when pressed, or a switch input that is out of the expected voltage range. The horn switch is a momentary contact that completes a circuit (typically to ground) when pressed, which the BCM interprets as a driver request and then energises the horn relay coil. When this code...

Join TaT to view the complete code information and diagnostic details.

Quick Facts