OBD-II Breakout Box (CAN Tester Box)
Overview：
A professional 12 V/24 V circuit-test and signal-access tool for diagnostics, development, and bench testing. It exposes every OBD-II pin, monitors live voltages (true RMS), provides optional CAN termination, and supports safe, fast hookup of other diagnostic/programming devices.
Features：
1.12 V / 24 V Compatible Circuit Tester
Robust design for passenger cars and commercial vehicles.
2.Real-time OBD-II Pin Voltage Monitor (VRMS / true RMS)
Power/ground integrity: e.g., pin 16 (+B) and pins 4/5 (grounds).
Bus activity on CAN / K-Line: checks whether static/dynamic levels look reasonable; a green background indicates dynamic values.
Pin assignment sanity-check: quickly validates expected wiring on retrofits or suspect harnesses—replacing basic VPP voltage checks.
3.120 Ω CAN Termination Switches
Inserts a 120 Ω resistor across the CAN pair to compensate for missing termination during single-ECU or small bench networks, improving signal integrity and reducing reflections.
HS-CAN: pins 6 ↔ 14 (standard).
OEM/MS-CAN (if present): pins 3 ↔ 11 (vehicle-dependent).
Use termination only for bench/missing-terminator scenarios; keep OFF during normal vehicle use to avoid over-termination.
4.Bench Testing Support
Provides convenient connectivity for IGN/START activation or external wake-up tools so ECUs can be powered and exercised on the bench.
5.Signal Status
Pin background flashing green = dynamic signal.
6.High/Low Voltage Audible Alarms
Low-voltage (slow beep):
12 V systems: < 11.8 V
24 V systems: < 23.6 V
High-voltage (fast beep):
12 V systems: > 15.5 V
24 V systems: > 31 V
7.Ground Status Indication
Pins 4 or 5 show OPEN when no ground is detected, and GND when a valid ground is present.
8.Quick Jumper Function (Technician Use Only)
Allows a trained technician to momentarily bridge selected OBD pins via current-limited paths for OEM-approved procedures (e.g., make-specific communication or synchronization tasks).
9.Battery Replacement Memory Saver
Maintains vehicle power (12 V/24 V) during battery changes so vehicle settings are preserved.
10.Convenient Connectivity
70 cm extension lead for rapid hookup to other diagnostic/programming tools.
External power input: 9–32 V DC, barrel 5.5 × 2.1 mm. Select 12 V or 24 V to match the vehicle battery or the module under test.
Important Safety Notes
For professional use. Incorrect pin bridging or inappropriate termination can damage ECUs or wiring.
Pins 3/11 are OEM-defined; only use the MS-CAN terminator when the vehicle actually implements CAN on these pins.
The real-time voltage view is a quick health check and does not replace an oscilloscope for waveform analysis.