Code Definition

B1634 — Mirror Driver Left Circuit Short To Ground

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

About B1634

B1634 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 B1634 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) 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.

B1634 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) monitors the integrity of its driver side exterior mirror output and sets DTC B1634 when it detects a short to ground on that circuit. This means the BCM is seeing the output line pulled to chassis ground when it expects to be controlling the voltage on that wire, indicating that the affected conductor has come into contact with bare metal somewhere between the BCM and the mirror motor. The mirror system uses small reversible DC motors driven by the BCM through paired output stages, and an unintended ground path on either side of the motor will trigger excessive c...

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