Code Definition

B1548 — Power Window Master Circuit Open

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

About B1548

B1548 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 B1548 is stored, the module has detected an open (broken or disconnected) electrical path 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.

B1548 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 integrity of the master power window switch circuit, which controls all four window motors from the driver's door panel. DTC B1548 is set when the control module detects an open circuit condition in the master power window switch circuit, meaning the signal, supply, or ground reference path between the master switch and the controlling module has lost continuity. This commonly occurs when the harness routed through the rubber pass through boot between the door and body has fractured wires from years of door movement, or whe...

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