DTC U0424-537: Invalid Data Received from HVAC Control Module [08/2013 - ]: Procedure

WARNING: This page is about a different car, the 2014 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.

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.

B → See step 3

A → See step 2

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to COMPONENTS [08/2013 - ]
GO TO DTC CHART (AIR CONDITIONING SYSTEM). Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2013 - ]