Looking for a cost-effective immobilizer chip repair solution on an older Toyota Starlet (around 1998)?
In this test, we repaired the immobilizer system without using an expensive original transponder. Instead, two aftermarket options were evaluated: the Xhorse Super Chip XT27 and the XT15.
The goal was to verify compatibility, functionality, and overall performance, providing a practical alternative for locksmiths and automotive technicians working on older Toyota models.
EEPROM Data Verification
The next step was to examine the immobilizer module, where a 24C04 EEPROM chip was identified. This chip contains the vehicle’s security information, including transponder key data and immobilizer synchronization records. Reading and verifying the EEPROM contents is essential for diagnosing key-related issues and restoring vehicle starting functionality.
Reading the EEPROM Data
The first stage of the procedure is extracting the EEPROM data from the memory chip. This operation can be carried out using a range of programming tools, such as the Xhorse Multi-Prog, Orange5, Autel XP400 Pro, or other compatible EEPROM programmers. After a successful read, save the dump file for further analysis and key data processing.
Make Key via Dump
Tango is mainly compatible with older Toyota immobilizer systems. On newer platforms, this type of dump-level data is often not directly supported.
However, both Autel and VVDI2 can successfully identify and process the 24C04 EEPROM used in Toyota Starlet IMMO modules, allowing key data extraction and key generation via dump.
Writing New Chips
Two different transponder chips were prepared:
- Super Chip XT27 – configured as a universal super chip for broad vehicle compatibility
- XT15 Chip– programmed as a dealer key using X115 for specific model matching
Both chips were successfully programmed using the VVDI2 device, with no need to reflash or modify the EEPROM afterward.
Testing and Results
After reinstalling the EEPROM back onto the immobilizer module, both transponder chips were tested in the vehicle. The outcome was clear:
- The XT27 chip performed flawlessly, and the engine started without any issues.
- The XT15 chip also successfully started the vehicle, even though it is often considered unstable or unsuitable by some technicians.
The customer confirmed that both chips functioned correctly and were able to start the engine. This shows that the original 7935 chip was not necessary for this application.
For this 1998 Toyota Starlet, both XT27 and XT15 transponder chips successfully replaced the original immobilizer chip. Although these chips are not universally compatible with all vehicles, they worked perfectly in this specific case.
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