What does the ECU do on a Lexus?

This article applies to the Lexus IS, GS, RX, ES (2004-2014). The engine control unit, or ECU, is basically the brains of your car. The ECU stores diagnostic trouble codes when it senses a malfunction so a mechanic can fix it later. It’s also the ECU’s job to store your driving data to customize your ride.

Where is the fuse box on a Lexus ECU?

Disconnect negative battery cable. This is the recommended way. It’s the easiest, there’s no risk of getting shocked by the battery, and it requires no special tools. All you need to do is remove and then re-install two fuses. Locate the fuse box under the hood on the passenger side near the strut tower.

Is there a way to reset the ECU?

This is the main way to reset the ECU. Be warned that going this route will clear out all presets including those for your radio, seats, navigation, etc. This is the easiest option and potentially the most annoying because it forces you to reset the settings.

What kind of ECU do I need for SC300?

To prep the SC for the GTE swap, I’ve sourced a MT GTE ECU and a Aristo ( JDM 2JZGTE ) engine harness. For those doing this swap into a SC300, the wiring is a lot easier than the typical S-Chassis wiring in that many of the vehicle’s functions and wires are the same.

Where is the body plug on the SC300?

This body plug disconnects from the sc300 along the firewall, next to the ABS module and near the windshield. Upon splicing open this harness, you will notice many similarities with your Aristo harness. The large connector on this harness connects to the SC300 body plug and also the small plug that leads to the ECU.

What does the ECU do on a Lexus?