Hello Yesa, can you tell me Detailed Launch X431 menu paths? thanks
Yes, very glad to offer you the answer. Here are the most detailed Launch X431 menu paths for Toyota Hev (Hybrid Electric Vehicle) battery-related functions, based on real procedures for models like Prius, Camry Hybrid, etc. (especially Gen 3/4 Prius).
- Launch cannot directly set or modify the actual HV battery voltage (e.g., you can't force it to 250V). It can only monitor, reset adaptive values, calibrate SOC estimation, or perform relearns after battery work.
- Always update your X431 software to the latest version first (HEV coverage is version-dependent).
- Ignition ON (READY mode sometimes required). Follow all on-screen prompts and safety warnings.
- High-voltage safety: Use proper PPE and procedures.
- Launch the Diagnostic app → Toyota (or Auto VIN / Manual selection).
- Select region (e.g., North America, Europe, Asia).
- Select vehicle: Prius (or Camry Hybrid, RAV4 Hybrid, etc.) → Year → Model variant (e.g., ZVW30, ZVW50).
- Choose Automatic Search or Manual → Confirm vehicle.
- Tap Control Units / All Systems or go directly to:
- Hybrid Control (or HV Battery, Battery ECU, Hybrid EV system).
- Or Engine and ECT (for some resets).
These resets learned values so the ECU re-adapts to the battery.
Path (from real X431 Torque/PRO example on 2015 Prius):
- Toyota → Vehicle selection (as above) →
- Control Units → All Systems → Engine and ECT.
- Special Function (or Utility / Initialization).
- Select Learning Value Reset.
- Follow prompts: Ignition ON, Engine OFF, Battery voltage >9V, etc.
- Confirm and execute. It usually completes in seconds.
- Alternative path in some software versions:
Go to Hybrid Control → Special Functions → Learning Value Reset or Clear Adaptive Values.
After module replacement or reconditioning:
- Hybrid Control (or HV Battery ECU) → Special Functions / Service / Utility.
- Look for: Replace Hybrid Battery, Hybrid Battery Relearn, SOC Reset / Battery Initialization, Battery Capacity Learning
- Follow on-screen steps (often involves driving cycles afterward for full adaptation).
- Hybrid Control → Special Functions → Select Battery Current Sensor Initialization (or Battery Current Sensor Reset).
- Or via broader menu: Service Resets and Relearns → Replace/Relearn Hybrid Battery → Battery Current Sensor Initialization.
This is the closest to "checking/modifying" behavior:
- Hybrid Control or HV Battery → Data Stream / Live Data.
- Common parameters: HV Battery Voltage (total pack), Battery Block Voltages (individual modules, e.g., Block 1–14), SOC (%), Current (A), Temperatures, Insulation Resistance.
- Look for imbalance (ΔV > 0.3V between blocks = problem).
- Hybrid Control → Active Test / Actuator Test.
- Examples: Contactor operation, Cooling Fan test, etc.
- Use Health Report (full system scan) first to see all DTCs.
- After any reset: Clear codes → Drive the vehicle (mix of city/highway) for 20–50 km so the system relearns SOC.
- For lithium conversions: These resets help the ECU accept new voltage curves, but you may still get codes without additional mods (resistor, BMS, etc.).
- Model-specific variations: Newer models (e.g., 2016+ Prius) may have more options under Hybrid EV System.
If your exact model/year differs (e.g., 2020 RAV4 Hybrid or Lexus), the paths are very similar but the exact submenu names can vary slightly.
Always prioritize safety — if you're unsure, consult official Launch updates or a trained hybrid tech. Let me know if you have more comments by leaving message below.