Code Definition

B2349 — Mirror Switch Reference Voltage Negative Common Open Circuit

System: Body  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About B2349

B2349 is a generic (obd-ii standard) body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B2349 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.

Because B2349 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The B2349 code identifies an open circuit on the mirror switch reference voltage negative common line, which is the shared ground return for the directional and mirror select switches inside the door mirror switch assembly. The driver door module or body control module provides the 5V reference on one side of the switch and senses each closure as the return current flows back through the negative common to module ground. When the ground return is open, no switch closure can be detected and this fault is set. The driver typically notices that no mirror switch input is recognised and that scan t...

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