Code Definition

B1443 — Door Handle Switch Circuit Open

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

About B1443

B1443 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 B1443 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.

B1443 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 on some vehicles a dedicated door module, monitors the door handle switch circuit to detect when the driver actuates the exterior door handle for keyless entry, passive entry, or interior dome lamp triggering. DTC B1443 is set specifically when the BCM detects an open circuit on the door handle switch input, meaning the signal voltage stays at the unloaded reference value and never pulls toward ground or reference when the handle is operated. The handle switch is typically a microswitch or capacitive sensor inside the handle assembly with a signal wire returni...

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