Code Definition

B1478 — Power Window One Touch Up/Down Activated Simultaneously

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

About B1478

B1478 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.

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.

B1478 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 power window system uses a master switch in the driver door and individual switches in the other doors to operate the window motors, with the BCM or a dedicated door module interpreting the switch inputs and driving the motor outputs. The one touch up and one touch down functions are software features that allow a brief press of the switch to fully raise or lower the window without holding it. Code B1478 is set when the control module receives simultaneous one touch up and one touch down inputs from the same window switch, which is an impossible mechanical state and indicates a switch or w...

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