For owners of select Toyota C-HR and Corolla models, the "Model ID DCU: 17TDT1EU-DA31" is a familiar sight when exploring the multimedia system's menus. This identifier represents a specific generation of Toyota's Display Control Unit (DCU) used primarily in Europe. While reliable, many owners have found that their unit benefits significantly from software and firmware updates. This article serves as a complete guide to the 17TDT1EU-DA31 update, covering its version history, update process, known issues, and the latest community findings.
or similar) is the sought-after "cure" for these digital headaches. The Upgrade Path
The (and associated 17TDT2EU-DA00/DA01) firmware refers to a critical software update designed for specific Lexus factory infotainment systems, particularly those updated to support modern, integrated smartphone functionalities . As of 2026, keeping your infotainment firmware current is essential for seamless Apple CarPlay and Android Auto performance. 17tdt1eu-da31 Software Update
system-update rollback 17tdt1eu-da30
Go back to the main Settings menu and select . For owners of select Toyota C-HR and Corolla
: Fixes intermittent issues where the Bluetooth connection might drop or fail to reconnect.
| Version | Filename | Release Date | Notes & User Feedback | |---------|-----------------------|------------------|---------------------------------------------------------| | | (not determined) | Mid‑2020 | First update that enabled Android Auto / CarPlay; often a transitional version. | | v1075 | 17TDT1EU-DA31_0076.kwi | Mar 2020 | “Improved stability and various bug fixes”; many users reported this version works reliably. | | v1101 | 17TDT1EU-DA31_0036.kwi | Nov 2020 | Also labelled “System: Improved stability, Various bug fixes – Audio Audio update 01101”. | | v1139 | (filename not public) | Dec 2020 | Minor update; some users encountered installation failures on certain hardware batches. | | v1170 | 17TDT1EU-DA31_0076.kwi (sic) | Apr 2021 | The last known public release for 17TDT1EU-DA31. | This article serves as a complete guide to
Start your vehicle and go to the (gear icon) on your infotainment display. Select System Settings . Choose System Info & Software Update .
Keeping your Toyota DCU updated fixes several chronic bugs reported by drivers across various automotive forums:
Yes. Use the “Maintenance Window” feature under System > Scheduler. Set a cron expression or specific date/time.