Engine warning light

[op910au]

I have a 2009 Hilux 4x2 SR 4L Petrol.

I recently installed a reversing buzzer by just hooking it up to the left reversing/ backup light. Works fine for work purposes but sometimes it would be useful to switch it off temporarily...eg leaving a motel carpark early hours. So I thought I would fit a simple switch. Tried to find the circuit and fuse which goes to this by description but no-luck. Eventually by a process of elimination found it was the "ECU-IG & GAUGE".10amp.

Haven't changed anything yet as obviously this goes to the ECU, which I assume is Electronic Control Unit? So may be the computer or emission control. So I have to come up with PlanB and wire the switch more locally to the reversing lights/ buzzer themselves.

However after replacing fuses the "engine " indicator stayed on the dash. Didn't appear to affect any functions whilst driving but the Manual says "Take vehicle to Toyota Dealer". However after a couple of stops and restarts it stayed off.

Should I need to do anything else (apart from not removing fuses indescriminately in the future) ???

Thanks in advance,
Rod

[fourwd1]

More than likely the fuse was pulled long enough for the ECU to wipe it's memory. Than after a few trips relearned everything.
Just to be sure you could see if any error codes were stored and aren't related to those circumstances.

[op910au]

Thanks fourwd1. Excuse the ignorance but how do I check for error codes stored and a listing of what (I assume something flashes??) they mean.

Just an aside...why would they put supply to reversing lights through a critical ECU fuse?? Is there any site where I can obtain an elecrtrical schematic for that model or something close?

Thanks again and regards,
Rod

[fourwd1]

You can get the error codes read by connecting a scanner to the OBD-II port.
Here in the states (most of them) you can go to any auto parts store and get it done for free.

The closest online downloadable FSM for your truck that I know of is for a 2007 US model pickup (aka Tacoma).