Code Definition

B1643 — Mirror Passenger Right Circuit Failure

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

About B1643

B1643 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 B1643 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.

B1643 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 door control module monitors the output driver circuits that control the passenger side outside mirror motor, with this specific code addressing the right direction output. DTC B1643 is set when the module detects a general electrical fault on that output, such as an open circuit, a short to power, a short to ground, or excessive current draw when the mirror is commanded to move in the right direction. The mirror motor uses bidirectional voltage applied through paired output drivers within the module, so the fault could affect movement in one direction while th...

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