Code Definition

B1234 — Mirror Switch Invalid Code

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

About B1234

B1234 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.

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.

B1234 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 mirror control switch is typically a multi function rocker style control located on the driver's door trim, allowing the driver to select between the left and right side mirrors and then adjust each in four directions. Most systems use a resistor ladder network, where each switch position produces a unique voltage level that the door module or body control module reads on a single analog input. DTC B1234 sets when the module detects a voltage pattern outside the valid range, or two switch positions being signalled simultaneously, which is mechanically impossible on a normal switch. With th...

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