Code Definition

B1631 — Mirror Driver Left Circuit Failure

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

About B1631

B1631 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 B1631 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.

B1631 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) detects a fault in the circuit that drives the left exterior mirror motor and position feedback. DTC B1631 sets when the BCM identifies an open circuit, short to ground, or short to battery condition on the left mirror driver output, or when the current draw on that circuit falls outside expected limits during commanded operation. The mirror system typically uses small DC motors for horizontal and vertical adjustment, with the BCM providing power and direction signals based on the mirror position switch input. When this code is set, the driver may notice that the ...

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