Code Definition

B2337 — Mirror Switch Assembly Circuit Open

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

About B2337

B2337 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 B2337 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 B2337 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

DTC B2337 indicates that the body control module or door module has detected an open in the exterior mirror switch assembly circuit, meaning the module no longer sees the expected idle voltage on one or more of the switch return inputs with the switch in its rest position. The mirror switch normally holds its inputs at a defined reference voltage through internal contacts or pull up resistors when no direction is selected, and pulls them to ground or to a specific ladder value when a direction is operated. When the resting voltage is lost (typically reading full reference or full open) the mod...

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