Code Definition

B1784 — Mirror Passenger Up Circuit Short To Battery

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

About B1784

B1784 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 B1784 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.

B1784 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 or Driver Door Module monitors the passenger side power mirror motor circuits and is able to detect short circuits between its drive outputs and battery voltage. DTC B1784 sets when the module sees voltage on the passenger mirror up drive wire while the output is supposed to be off, or when excessive current flow is detected to a battery feed during the up command. The mirror motor is a small reversible DC motor driven through H bridge outputs, and a short to battery on the up drive line means the motor terminal is being pulled to a hot circuit through chafed insulation...

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

Quick Facts