Complex Automotive Circuits Hard to Trace? Abnormal Signals Hard to Diagnose?
The AUTOOL DM109 is a multifunctional automotive circuit system tester that combines a multimeter, oscilloscope, relay tester, fuel injector tester, and component activation functions in one device. No need to switch between multiple devices. The DM109 provides comprehensive testing for 9~72V vehicle electrical systems, helping complete a wide range of diagnostic tasks with one device.
The AUTOOL DM109 features a built-in intelligent recognition system that automatically identifies voltage or resistance. Combined with multimeter test leads, it can function as a high-precision multimeter. It supports 0–5V signal simulation output and features a dual safety protection system with a fuse and resettable circuit breaker. Three activation modes are also available to directly drive various vehicle electrical components, helping quickly distinguish component faults, wiring faults, and control module issues. It is suitable for testing a wide range of automotive electrical systems, circuits, and electronic components.
Key Features
Circuit Troubleshooting
Supports voltage and polarity testing, continuity testing, circuit signal testing, resistance and diode testing, automotive indicator light and wiring tests, open/closed circuit testing, poor ground fault detection, and short circuit troubleshooting and localization. One DM109 handles a wide range of common circuit problems.
High-Precision Multimeter
When used with multimeter test leads, the DM109 can function as a high-precision multimeter. It supports voltage measurement with 0.001V resolution, current measurement with maximum/minimum value recording, resistance measurement, continuity testing for open circuits, closed circuits, intermittent circuits, and stable circuits, diode testing for forward voltage drop and conduction status detection, frequency measurement with simultaneous duty cycle display, and temperature measurement from -20 to 600°C, helping assess the operating condition of electrical components, engines, and air conditioning systems.
Three Activation Modes
Provides three modes: MOMENT for momentary activation, LATCH for latching activation, and PULSE for pulse activation. The DM109 can directly drive common electrical components such as blower motors, window motors, windshield wipers, stepper motors, rear window defrosters, lights, cooling fans, and fuel injectors. Quickly distinguish between component faults, wiring faults, and control module issues, reducing unnecessary disassembly and replacement while improving repair efficiency.
Automatic Polarity Detection
The built-in intelligent recognition system automatically identifies voltage and resistance without manual range switching. It also accurately determines circuit polarity:
- Positive Polarity: Red LED + audible buzzer
- Negative Polarity: Green LED
Simply connect and test. Easy to use, even for beginners.
Automatic Power-Off Protection
Features a dual safety protection system combining a fuse and resettable circuit breaker. When a short circuit or overload occurs, the device automatically disconnects the circuit to help protect both the testing device and the vehicle, ensuring safer operation.
Wide Vehicle Compatibility
Supports 9~72V vehicle electrical system testing and is compatible with 12V/24V/36V/48V/72V vehicles, including sedans, SUVs, pickup trucks, motorcycles, trucks, RVs, buses, tractors, golf carts, 48V mild hybrid vehicles, electric bicycles, and marine vessels.
2.8-Inch IPS HD Color Display
Features a 2.8-inch IPS HD color display that delivers clear, high-definition images for easy data reading in both bright and low-light conditions.
Auxiliary Lighting
Equipped with an LED auxiliary light—no need for an additional handheld flashlight, making circuit inspection in dark areas easy while freeing up both hands and improving inspection efficiency.
One-Click Firmware Upgrade
Supports one-click firmware upgrades via a Type-C connection to a computer, continuously optimizing performance and functionality to keep the device in optimal condition.
The AUTOOL DM109 is a professional-grade automotive circuit system tester that integrates multiple core functions, including a multimeter, oscilloscope, component activation, and signal simulation, into one device. With a wide 9~72V voltage range, it is suitable for gasoline vehicles, hybrid vehicles, electric vehicles, and various engineering vehicles. One device in hand, no circuit worries—an essential professional-grade diagnostic tool for auto technicians and electrical engineers.
