Code Definition

B1243 — Express Window Down Switch Circuit Short to Battery

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

About B1243

B1243 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 B1243 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.

B1243 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 express window down switch circuit allows the driver or passenger door window to be lowered automatically with a single press of the switch, with position feedback monitored by the door control module or body control module. The control module pulls the express switch input down through an internal pull up resistor and interprets a low signal as a switch press to activate the express down function. DTC B1243 is set when the module detects a continuous battery voltage at its express window down input pin, indicating a short to the 12V supply in the switch, harness, or connector. When this c...

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