Code Definition

B1399 — Driver Power Window One Touch Window Relay Circuit Open

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

About B1399

B1399 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 B1399 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.

B1399 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 B1399 when it detects an open circuit on the driver power window one touch (express) relay control. The module commands a dedicated relay to latch the window motor in the up or down direction for the full travel after a brief switch press, then monitors the relay coil control side for the expected voltage swing; if the line stays at the inactive level when commanded or sits at an unexpected high impedance during the self test, the module logs B1399. Common causes include a broken conductor through the driver door jamb harness, an ...

Join TaT to view the complete code information and diagnostic details.

Quick Facts