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Toyota Techstream is the software used by dealerships for vehicle diagnostics and to personalize settings on your Toyota, Lexus or Scion vehicle.

The software connects to a car via a Mini VCI cable through the OBDII port. Cheap cables, available on eBay, emulate a serial port to which Techstream software communicates to your car's CAN bus.

The software allows you to access vehicle settings, such as door locks, transmitter, engine immobilizer programming, power window, interior illumination as well as security and headlights. It is also used to read specific ECU codes from the engine computer, ABS/TRAC/VSC, SRS Airbag and occupant detection systems.

Built in diagnostic tools allow you to perform tests on failing parts to determine what is at fault.

Additionally, having access to techstream allows you to program your own chipped keys and wireless remotes.

This tutorial quickly goes through the settings and monitors available in Techstream for a Lexus ES330. It will be similar for many other Toyota, Lexus and Scion vehicles that use the CAN bus made after ~ 2002.

Here are the installation instructions:

The cable was purchased from eBay.

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