Lexus LS430 - climate control isn't working. The Lexus LS430 doesn't have CANBUS, so I'm choosing the LC100 High. Everything worked before, but it probably stopped after the update. The radio is completely useless without air conditioning or blower controls. I'm considering returning the radio to the seller.

Hello,

I am using a DUDU7 head unit based on UIS7870 platform.

Device details:

Model: DUDU7
SoC: UIS7870
MCU firmware: 2024.01.24 (DUDUAUTO_53_L7870_N32P48F64_3G_E60_V1.0)
System: DUDU OS 250905

CANBUS details:

Model: LZ-LK-02
Label: “CAN BUS DECODER – For Lexus LS430 High”
HW: V1
SW: V4

Important information:

HVAC (air conditioning) control WORKED correctly before system/MCU update or power reset.
After the update, HVAC control from the Android screen stopped responding.
The original factory radio controls HVAC correctly, so the car and HVAC ECU are fully functional.
The CANBUS hardware is correct and dedicated for Lexus LS430 High.

Current issue:
It appears that the current MCU firmware no longer loads or contains the Lexus LS430 HVAC protocol/driver.
The CANBUS is now detected as Toyota LC100 fallback, which does not provide HVAC communication for LS430.

This is a software regression, not a hardware issue.

What is required to fix this:

Restore or add Lexus LS430 HVAC protocol support in the MCU firmware, OR
Provide a patched/custom MCU firmware for UIS7870 that includes Lexus LS430 HVAC support, OR
Provide a compatible CAN protocol driver for CANBUS LZ-LK-02 (LS430 High) that works with MCU 2024+.

Important notes:

MCU downgrade is blocked by anti-rollback, so rollback is NOT possible.
Replacing the CANBUS is not necessary, as this CANBUS worked correctly before.
The issue is fully reproducible and clearly related to MCU software.

Please advise:

If an MCU update or patch can be provided to restore Lexus LS430 HVAC functionality.
Or if there is an official solution for Lexus LS430 on UIS7870 with current MCU versions.

Thank you for your technical support.

Below are videos of the action and logs

https://youtu.be/uPA_njD5qgw?si=0dDiyfm08sf1OKFp

https://youtube.com/shorts/wOosuoA5XWc?feature=share

https://youtube.com/shorts/kJ7AfLHill8?feature=share

log-2026-01-02-0.txt

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