Code Definition

B1549 — Power Window Master Circuit Short To Battery

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

About B1549

B1549 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 B1549 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.

B1549 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 Driver Door Module (DDM) monitors the master power window switch circuit for abnormal voltage levels, where the signal lines should swing between defined low and high states as the switches are operated. DTC B1549 is set when the control module detects a short to battery voltage condition on the master power window circuit, meaning one of the switch input lines is being held at full battery voltage when it should not be, indicating an unintended connection to a 12V source. This commonly results from chafed wiring contacting an adjacent power feed inside the doo...

Join TaT to view the complete code information and diagnostic details.

Quick Facts