Code Definition

B1985 — Seat Switch Lumbar Deflate Circuit Failure

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

About B1985

B1985 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 B1985 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.

B1985 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 Driver Door Module monitors the lumbar deflate switch circuit on the seat switch pack. DTC B1985 sets when the module detects an electrical fault on this circuit, typically caused by a switch that is stuck closed, a short to power or ground in the signal wiring, or an open circuit between the switch pack and the controlling module. The lumbar deflate switch is a momentary contact input within the seat or door mounted switch pack that signals the air pump or solenoid valve to release pressure from the lumbar bladder. When this code is set the lumbar release func...

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

Quick Facts