Code Definition

B3806 — Main Beam and Headlamp Flash Select Signal

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

About B3806

B3806 is a manufacturer-specific body diagnostic trouble code recorded for Holden vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

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.

B3806 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 main beam and headlamp flash select input from the steering column combination switch to verify correct voltage transitions corresponding to driver input. The combination switch signals high beam and flash to pass requests to the BCM, which then commands the headlamp outputs. DTC B3806 is set when the BCM detects an implausible signal, open circuit, short to ground, or short to battery on the main beam or headlamp flash select signal for a calibrated period, meaning it cannot reliably determine high beam or flash to pass requests. When this code is se...

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