Code Definition

B2596 — Headlamp Aim Output Relay Circuit Short To Battery

System: Body  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About B2596

B2596 is a generic (obd-ii standard) body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B2596 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.

Because B2596 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The B2596 fault code is set when the control module driving the headlamp aim output relay detects a short to battery voltage on the relay control circuit. Automatic headlamp leveling systems use ride height sensors to determine vehicle attitude and command an aim motor or relay to keep the headlamp beam at the correct angle regardless of vehicle load. When the module commands the relay off but reads battery voltage on the output pin, this code logs the unintended high signal. The driver may notice the headlamps stuck at maximum down aim, the leveling system warning lamp illuminated, or oncomin...

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