Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Signal Specification
General
All values contained below are between the relevant terminal and signal ground, unless otherwise indicated in brackets.
It is important to connect the breakout box and check the ground terminals before taking readings.
| U= | DC voltage in volts (V) | UAC = | AC voltage in volts (V) |
| Ubat = | Battery voltage (V) | f = | Frequency in Hertz (Hz) |
| Ulow = | Voltage approximately 0 V | t = | Time in seconds (s) |
| Control module terminal | Breakout box terminal | Signal type | Ignition on | Other |
|---|---|---|---|---|
| #A1 | #1 | - | - | |
| #A2 | #2 | Signal malfunction indicator lamp (MIL) | Lamp off: U = Ubat Lamp on: U = Ulow |
|
| #A3 | #3 | Power supply Extended X | U = Ubat | |
| #A4 | #10 | Signal ground | U = Ulow | |
| #A5 | #9 | - | - | |
| #A6 | #8 | - | - | |
| #A7 | #7 | - | - | |
| #A8 | #6 | - | - | |
| #A9 | #5 | Control modules communication cable (CAN L) | U = 1.5-2.5 V | |
| #A10 | #4 | Control modules communication cable (CAN H) | U = 2.5-3.5 V |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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