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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 61 (Hybrid Control System (2WD) - Diagnostic Codes (7 Of 7) & Circuit Tests) >> HYBRID CONTROL SYSTEM (for 2WD) >> DTC U0424-81: HVAC Control Module to Hybrid Powertrain Control Module Invalid Serial Data Received [12/2019 - 11/2023] >> Confirmation Driving Pattern

Confirmation Driving Pattern

WARNING: This page is about a different variant/trim than selected.

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 [12/2019 - 11/2023]

  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON and turn the GTS on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the ignition switch off and wait for 2 minutes or more.
  5. Turn the ignition switch to ON and turn the GTS on.
  6. 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).
  7. Turn the air conditioning system off and wait for 10 seconds or more with the ignition switch ON (READY).
  8. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
  9. 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.
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