DTC U0424-81: HVAC Control Module to Hybrid Powertrain Control Module Invalid Serial Data Received [08/2020 - ]: Procedure
WARNING: This page is about a different car, the 2024 Lexus ES 300h, 2023 Lexus ES 300h, 2022 Lexus ES 300h, and 2021 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK DTC OUTPUT (AIR CONDITIONER)
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG).
- Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes.
- Check if DTCs related to the air conditioning system (A/C) are output.
Body Electrical > Air Conditioner > Trouble Codes
Result
Result Proceed to DTCs related to A/C are not output. A DTCs related to A/C are output. B - Turn the power switch off.
Result:
A
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to REMOVAL [08/2020 - ]
Result:
B
GO TO DTC CHART (AIR CONDITIONING SYSTEM). Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2020 - ]