Code Definition

B1637 — Mirror Driver Right Circuit Short To Battery

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

About B1637

B1637 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 B1637 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.

B1637 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 right side outside mirror motor. DTC B1637 is set when the module detects that one of the mirror motor driver outputs is shorted to battery voltage, meaning the wire is being held high by an external source rather than being controlled by the module's output stage. The module senses this using internal current and voltage feedback on the output pin and disables the driver to protect itself. When this code is set, the right side mirror typically fails to move correctly in one or both direct...

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