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 given below are between the terminals stated in column 1 and breakout box terminal in the control module) and terminal B2 in column 1 (terminal in the Control module) unless otherwise indicated in column 6 (Miscellaneous).
There is no wiring on the Power Steering Control Module (PSCM) for connecting the breakout box. It is therefore important when any measurements are carried out that great care is taken to prevent short-circuits, damage to connectors, etc.
| 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 | % duty = | Duty cycle (pulse ratio) as a percentage (%) |
| t = | Time in milliseconds (ms) | I = | Current in Amperes (A) |
| Control module terminal | Breakout box terminal | Signal type | Ignition on | Engine idling | Miscellaneous |
| #A1 | - | 15-supply, from the ignition switch | U = Ubat | U = Ubat | Ignition off: U = Ulow |
| #A2 | - | Control modules communication cable (CAN L) | - | - | |
| #A3 | - | Control modules communication cable (CAN H) | - | - |
| Control module terminal | Breakout box terminal | Signal type | Ignition on | Engine idling | Miscellaneous |
| #B1 | - | 30-supply (Power supply from the battery) | U = Ubat | U = Ubat | Ignition off: U = Ubat |
| #B2 | - | Power ground | U = Ulow | U = Ulow | Ground terminal, connected to the chassis |
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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.