Code Definition

B1639 — Mirror Passenger Left Circuit Failure

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

About B1639

B1639 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 B1639 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.

B1639 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 circuit that controls the left side outside mirror motor, which is the passenger side mirror on right hand drive vehicles. DTC B1639 is set when the module detects a general electrical fault in that driver circuit, such as an open circuit, a short to power, a short to ground, or excessive current draw when the mirror is commanded to move. The mirror motor uses bidirectional voltage applied through paired output drivers within the module to position the mirror glass for vertical and horizontal adjustment, and on som...

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