Code Definition

B1586 — Dim Panel Decrease Input Circuit Short To Ground

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

About B1586

B1586 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 B1586 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) 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.

B1586 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, which is the wire from the dimmer decrease switch that the BCM uses to lower the brightness of the instrument cluster and dashboard illumination. DTC B1586 sets when the BCM detects the dim panel decrease input is shorted to ground, meaning the input is reading active continuously instead of only while the switch is being pressed. Common causes include harness chafe against a chassis ground point, a dimmer switch that fails internally with its contacts welded closed, water intrusion at a connector, and aftermarket ...

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