Code Definition

B1400 — Driver Power Window One Touch Window Relay Circuit Short To Battery

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

About B1400

B1400 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 B1400 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.

B1400 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 Door Control Module (DCM) sets B1400 when it detects an unintended battery voltage on the driver power window one touch (express) relay control circuit. The express function uses a dedicated relay so the module can latch the window motor for the full travel after a momentary switch press; the module monitors the relay coil control side and sets B1400 when that line sits at battery voltage outside the normal commanded window. Common causes include a chafed wire through the door jamb harness shorting against a powered conductor, an aftermarket window or alarm ins...

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