Code Definition

B1984 — Seat Switch Lumbar Inflate Circuit Failure

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

About B1984

B1984 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 B1984 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.

B1984 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 inflate switch circuit on the seat switch pack. DTC B1984 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 inflate switch is a momentary contact input within the seat or door mounted switch pack that signals the air pump or solenoid valve to inflate the lumbar bladder. When this code is set the lumbar adjustment function may be...

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