Code Definition

B1477 — Wiper Hi/Low Circuit Motor Short To Ground

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

About B1477

B1477 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 B1477 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit; and a signal or supply voltage lower than the expected operating range.

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.

B1477 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 wiper motor system uses the Body Control Module (BCM) or a dedicated wiper module to drive the wiper motor through high speed and low speed control circuits, allowing the operator to select wiper speeds via the column stalk switch. Code B1477 is set when the control module detects a short to ground condition on the wiper motor high or low speed control circuit. The wiper motor typically uses two field windings (high and low) energised through separate driver circuits, and the module monitors current draw and circuit voltage to detect circuit faults. When this code sets, the wipers may fail...

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