J1939 Cab Switch Interface Controller
Bridge Digital Cabin Signals to Real ECM Control
Control Switch
The INPRONIC Control Switch is a J1939 CAN-based interface module designed to convert digital cab switch data into reliable, opto-isolated low-side outputs for modern engine control systems.
Built for electronically controlled engines (Cummins, Volvo, CAT and others), this unit reads J1939 CAN messages from the cabin and activates the appropriate ground-controlled signals required by the Engine Control Module (ECM)
Designed for reliable J1939-based engine control integration.
Revolutionizing Automotive Control.
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Control Switch
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Monitors J1939 Cab Messages
Filters switch and status data
Applies rule-based output logic
Activates 12 opto-isolated low-side outputs
Control Modern Engines the Right Way
Digital cabin → J1939 CAN → Deterministic low-side outputs.
No direct ECM wiring.
No signal noise.
No compatibility issues.
Typical assignments include:
• Parking brake
• Clutch brake
• Service brake
• Engine retarder (low / med / high)
• Cruise resume
• Cruise set
• Cruise enable
• Fan override
• Auxiliary outputs (3 user-defined channels)
Free shipping in the U.S.
Tech Specs
J2 Connector (Power + CAN)
• 12V–24V input
• CAN High
• CAN Low
• Ground
J1 Connector (Outputs)
• 12 programmable low-side outputs
• High impedance protected outputs
• ECM-ready grounding signals
Each output is opto-isolated to protect:
✔ Vehicle CAN network
✔ Engine Control Module
✔ Cabin wiring
✔ Auxiliary systems
FAQs
Please read our FAQs page to find out more.
Why It’s Different
Unlike passive relay boards:
✔ Logic-based activation
✔ CAN message interpretation
✔ Deterministic control
✔ ECM-compliant outputs
✔ Reduced harness complexity
What is the Control Switch module used for?
The Control Switch is a J1939-based Cab Switch Interface Controller designed to monitor digital cabin switch data and convert it into clean, ground-activated (low-side) outputs required by modern engine ECMs.
It bridges digital J1939 switch communication with physical ECM control inputs.
Are the outputs electrically isolated?
Yes.
Each channel is opto-isolated to protect:
- The engine ECM
- The CAN network
- The cabin electronics
- The vehicle wiring harness
This prevents noise, voltage spikes, and fault propagation.
What voltage does the module operate on?
The Control Switch operates on12V to 24V systems, making it suitable for heavy-duty trucks, buses, and industrial applications.
Does it modify J1939 CAN messages?
No.
The device reads and interprets J1939 messages but does not alter network traffic. It applies rule-based logic internally to activate physical outputs.