Automatic Lights Not Working

Sounds like grime or smear on the dash sensors. Wipe them with clean cloth. Are they “staying on”. Check sensitivity in Menus.

 

Amen to that

 

Did that. They're not coming on at all in Auto mode doesn't matter if I cover the sensor or if it's at night. No auto lights.

 

If you have a hard time with the electrical diagrams and have done all the easy things you should just head to the dealership and have them fix it

when turning on your headlights is an inconvenience fixing the system might be out of your wheel house

 

Cool snark, bro. Yeah, fuck me for wanting things to work properly. I'm trying to troubleshoot the simple things first. I have plenty of experience wiring motorcycles, this is a bit different. I'm just trying to figure out what fuses correspond with the sensor systems so I can check those.

 

Go back to Caribe's posts, not only is he the electrical guru, but he is also very patient and gracious about helping TW members.. He's spoon feeding you the wiring diagrams and inspection sheets out of the toyota service manuals in his posts. Can you guess what the dealership techs will look at when you take it there? -yep same thing.

So if these aren't making sense to you take it to the dealership.

 

as stated in a previous post by those that know there is no fuse. Better get to dialing the dealership

 

I'll pass

 

Just for shits n giggles, with the vehicle OFF, remove the 7.5 amp fuse the reads ECU IG No.2 and replace with a known good one.

 

I'll give it a try. Don't have any 7.5 amp fuses on hand so will have to do later. I did pull it out, though, just to see if it was blown. It's not, but who knows.

 

Just gave it a try. No dice.

 

I suspect the Main Body ECU is slowly failing...

 

sounds pricy

 

Your guess is as good as mine. Code reader showed up and it's not throwing any codes so who knows.

 

$1,300 +/- ?

[A] 8_A is the auto feature (ground)
[HEAD] 12_A is to light stalk select of HEADLIGHTS
[HU] 24_A is to light stalk at High Beams n Flash

[CLTB] 19_A is power to sensor
[CLTS] 20_A is sensor output
[CLTE] 21_A is sensor ground

 

One thing I did notice is that there is just an open ended plug. Not sure if it's always been there (maybe for some other option?) or if it somehow worked itself out, which seems unlikely. Doesn't seem to reach to anything. This is under the dash basically up against the firewall.

 

Thanks for this.

Yeah, definitely not worth fixing. I honestly couldn't care less about the safety features. Would be great if they were working but whatever. Auto lights isn't the end of the world either.

 

That is the towing break connector, it's loose back there until you add a towing brake module pigtail.

 

But you also mentioned that the BSMS (Blind Spot Monitoring System) and the RCT, which I don't know what that means, are also AFU.

 

Blind Spot Monitoring and Rear Cross Traffic monitor