Description: Bunk Control Unit
Condition: New
Brand: Mack/Volvo®
Part Number: 21693236
A Bunk Control Unit (BCU) — also known as a Sleeper Control Module or Living Environment Control Module (LECM) — is an electronic control system in heavy-duty trucks (like Volvo, Mack, or Freightliner) that manages the comfort features inside the sleeper/bunk area of the cab.
It allows drivers to control climate, lighting, and auxiliary power functions from the sleeper without needing to sit in the driver’s seat.
Main Functions of a Bunk Control Unit 21693236
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Climate Control
Adjusts heating, air conditioning, and fan speed for the sleeper area.
Works with the HVAC system to maintain the selected temperature even when the engine is off (in trucks with parking HVAC systems).
Lighting Control
Controls reading lights, dome lights, and night lights in the bunk area.
Power Management
Operates auxiliary power systems (APU) or battery-powered HVAC functions.
Can monitor battery voltage and automatically shut off certain systems to prevent battery drain.
Alarm & Convenience Features
Some units include alarm clock, sleeper lock, window controls, or radio control functions.
In modern trucks, it connects with the main cab’s CAN network for integrated communication.
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Where It’s Located 21693236
Usually mounted:
Near the bed area, often on the side wall or overhead console.
In Volvo trucks, it’s typically located near the bunk heater vent or under the lower bunk.
Signs of a Faulty Bunk Control Unit 21693236
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Sleeper fan, heater, or A/C not responding
Bunk lights or outlets not working
Display not lighting up or showing error messages
Inconsistent temperature control
Communication codes (e.g., CAN bus faults) logged in the truck’s diagnostic system
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Example (Volvo Part 21693236)
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Found in Volvo VNL, VNX, and VHD models
Controls bunk HVAC and auxiliary functions
Works with related modules such as:
Living Environment Control Module (LECM)
Cab Climate Control Module (CCM)
APU Controller (if equipped)
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Manufacturer information
With more than a million of their trucks on the road today, Volvo Trucks® is among the world’s trusted names in medium to heavy duty trucks. A division of the automaking giant Volvo Group, Volvo Trucks offers complete transport solutions for a wide range of industries, with manufacturing facilities across 13 countries and 2,300 service points across the globe. They also offer genuine replacement parts that are manufactured under the same uncompromising standards as their stock counterparts. Each genuine Volvo Truck component is also tested both in the laboratory and in the field. From freezing winters to the desert heat, customers can rest assured that their Volvo Truck parts will run reliably even under such conditions.
Warranty
First Truck Parts offers a 365-days warranty for all types of parts and in any condition. The warranty applies only to buyers who have placed an order on our website.
