Code Definition

B1584 — Dim Panel Decrease Input Circuit Open

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

About B1584

B1584 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 B1584 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.

B1584 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) monitors the panel dimmer decrease input circuit, the wire that carries the driver's signal to dim the instrument cluster and dashboard illumination. DTC B1584 sets specifically when the BCM detects an open circuit on this input, meaning the wire is broken, the switch is failing to make contact when pressed, or a connector is disconnected somewhere between the dimmer assembly and the BCM. The dimmer decrease switch normally completes a path to ground (or to a defined reference voltage) when pressed, and the BCM uses that signal to step its PWM output to the panel ...

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