Code Definition

B1398 — Driver Power Window One Touch Window Relay Circuit Failure

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

About B1398

B1398 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 B1398 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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.

B1398 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 B1398 when it detects a malfunction in the driver power window one touch down (or one touch up/down) relay control circuit. Express window operation is achieved by the module driving a dedicated relay that latches the window motor in the up or down direction for the full travel after a brief switch press; the module monitors the relay control side for the expected voltage response and sets B1398 when the circuit reads open, shorted to ground, shorted to battery, or otherwise out of the calibrated range. The fault may set on key on...

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