Code Definition

B1573 — Door Ajar LR Circuit Short To Battery

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

About B1573

B1573 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 B1573 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.

B1573 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) monitors the left rear door ajar switch circuit by applying an internal pull up reference voltage to the signal wire and watching for the switch to ground that signal when the door opens. DTC B1573 sets when the BCM detects that the left rear door ajar signal wire is being pulled to battery voltage continuously, indicating the signal circuit has shorted to a 12V source somewhere along its length. This usually means the door ajar wire has chafed against a power feed wire inside the door, the body harness, or behind a trim panel. When this code is set, the BCM canno...

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