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Home >> Lexus >> 2024 >> TX 350 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 84 (Hybrid Control System - Diagnostic Codes (5 Of 5) & Circuit Tests) >> HYBRID CONTROL SYSTEM (for 1Motor-HEV Model) >> DTC U0424-81: HVAC Control Module to Hybrid Powertrain Control Module Invalid Serial Data Received [09/2023 - ] >> Confirmation Driving Pattern

Confirmation Driving Pattern

WARNING: This page is about a different car, the 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.

HINT: 

After repair has been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Refer to UTILITY [09/2023 - ]

  1. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  2. Turn the ignition switch off and wait for 2 minutes or more.
  3. Wait for 1 minute or more with the vehicle stopped, the ignition switch to ON (READY), park (P) selected and the air conditioning system on (Lo/COOL MAX, blower speed HI).
  4. Turn the air conditioning system off and wait for 10 seconds or more with the ignition switch ON (READY).
  5. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
  6. Check the DTC judgment result.

    HINT: 

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE, perform driving pattern again.