Managing separate warning light and siren controllers adds complexity for drivers who need to act fast. The BCH-D integrated controller brings both functions into a single unit, with a control interface that shows what is active and responds to simple button operations without memorisation.
Why Separate Controllers Create Problems
Most emergency vehicles still run on two independent systems: a light controller for the warning bar and a separate siren controller for the horn. When drivers need to switch modes quickly, this creates:
Two hands, two panels — reaching for two separate controls in an emergency is slower and more error-prone.
No unified status display — the driver cannot see at a glance which lights are active and which siren mode is engaged.
Separate wiring runs — more cables, more connectors, more potential failure points.
These problems compound when vehicles are shared between officers or used across different emergency scenarios that require different warning combinations.
The BCH-D Solution: Two Systems, One Interface
The BCH-D integrates warning light control, siren control, and real-time light status monitoring into a single unit:
Three control sections in one panel — light control, siren control, and simulated light monitoring on a single interface.
Button operations designed for real use — single-click and double-click operations, plus short-press and long-press (over 1 second) for different functions. No menu diving, no memorisation.
Real-time digital light status — when paired with BCH series digital light bars, the controller displays the active light pattern live on screen.
USB MP3 digital audio input — load custom audio files in MP3 format for specific alert tones.
Button Operations at a Glance
The BCH-D uses a layered button operation system built for speed:
Operation
Function
Single click
Activate/deactivate individual light patterns or siren modes
Double click
Switch between preset configurations without navigating menus
Short press
Standard on/off toggle
Long press (>1 second)
Access secondary functions or emergency priority modes
This means a driver can activate the correct warning combination without looking at a manual.
Wide Compatibility Across Vehicle Types
The BCH-D works with a range of vehicle electrical systems and light configurations:
Voltage range: DC 9–30V — covers both 12V and 24V vehicle systems without separate models.
Compatible with BCH series digital light bars — full digital communication for real-time pattern display.
Two universal light control channels — supports non-Liyi warning lights with a load current up to 5A per channel, with live digital simulation monitoring available only for BCH series.
100W audio output at 6Ω — drives standard emergency vehicle speakers.
Blade fuse protection: 10A/15A — easy to service in the field.
Standards Compliance
The BCH-D controller is manufactured to meet:
GB 13954-2009 — Chinese standard for fire-fighting vehicle electronic sirens and warning equipment.
GB 8108-2014 — Chinese standard for vehicle warning lights and electronic warning devices.
These standards define performance, durability, and safety requirements for emergency vehicle equipment in the Chinese market.
FAQ
Q: Can the BCH-D controller operate non-Liyi warning lights?
A: Yes. The BCH-D provides two universal light control channels that support third-party warning lights with a load current of 5A or less per channel. Live digital simulation monitoring is available only when paired with BCH series digital light bars.
Q: What is the power output of the BCH-D siren?
A: The BCH-D delivers 100W audio output into a 6Ω speaker load. It accepts audio input via a Φ3.5mm analog audio port (maximum input level 5V) or via USB MP3 digital audio input.
Q: How does the long-press button operation work in an emergency?
A: A long-press (over 1 second) activates secondary functions or emergency priority modes directly, without navigating a menu. This is designed so drivers can switch to the highest-priority warning configuration in a single sustained action.
Before you choose an emergency vehicle control system, ask whether the light and siren can be operated from a single integrated panel, and whether the interface gives real-time status feedback. LIYI provides BCH-D specifications and compatibility documentation on request.
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