'12 Prius - Hazard lights flashing on their own!
Автокөліктер мен көлік құралдары
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Today we are showing the diagnostic process used to diagnose a failure in a 2012 Prius where the hazard lights continued to flash, even with the hazard light button disconnected!
I Hope you enjoy! Be sure to like and subscribe!
The views and opinions expressed are in these videos are my own, and have not been reviewed or approved by my employer, and do not necessarily represent the views and opinions on my employer.
Пікірлер: 171
Prius owner: I can't turn off my hazard flashers! Toyota Tech: you need a new ABS control module. Customer: damn stealership always trying to rip me off!! haha Wow! Great diag, PJ!
@VoltageDropDiagnostics
3 жыл бұрын
haha! Luckily on THIS prius, the ABS module was covered under an extended warranty up to 150,000 miles. But the other prius mentioned in the video had over 200,000 and a new one was expensive.
@behappy0803
3 жыл бұрын
Customer: I wanna fix my flasher. I don't have a problem with abs. I need to take my car to real mechanic. LOL good work PJ
@PineHollowAutoDiagnostics
3 жыл бұрын
@@VoltageDropDiagnostics Can you just snip the hazard wire going to the ABS module?
@VoltageDropDiagnostics
3 жыл бұрын
@@PineHollowAutoDiagnostics yeah. I know a couple of techs that have without creating any issues. But I’m gonna be honest, i can’t find out why that circuit is ran to that module. I don’t know if during emergency braking, it causes the hazard lights to come on? I honestly don’t know what it is there for.
@PineHollowAutoDiagnostics
3 жыл бұрын
@@VoltageDropDiagnostics Only one way to find out! :D
Excellent tip, PJ. It shows that it is worthwhile to look a little further past the standard diagrams when something just doesn't seem right.
@VoltageDropDiagnostics
3 жыл бұрын
Yes! A lesson learned for me as well!
@ibrahimatasoy3029
Жыл бұрын
hi do you have to reprogram the car after replacing this part?
My 2012 has suddenly developed this problem, I may forward this to my mechanic! Thank you so much for sharing this info you really thought it out very clearly.
@VoltageDropDiagnostics
3 жыл бұрын
Glad it helped
Thank you PJ. Good job again. Have a blessed and safe week to you and your family.
@VoltageDropDiagnostics
3 жыл бұрын
Same to you
Had a guy on FB recommended your channel to me because I got a new maxisys ultra. Love your videos brother!
@VoltageDropDiagnostics
3 жыл бұрын
Awesome! Thank you!
Great Video, Thanks for the tip. Today was snowy and slippery after a little the hazards came up and stayed up.
Thanks for the help PJ! I was able to get the lights to go out by pulling fuse 7.5A ABS Main #2 fuse, thanks for pointing me in the right direction!
@VoltageDropDiagnostics
3 жыл бұрын
Nice! Glad that I could help!
@adamhonda98
3 жыл бұрын
Yo this is the same thing that happens in mine as well but what did you replace to fix it was it the ABS module? Because he mentioned flasher unit as well in the video
@VoltageDropDiagnostics
3 жыл бұрын
@@adamhonda98 yeah. The abs module fixed it.
@adamhonda98
3 жыл бұрын
@@VoltageDropDiagnostics awesome I'm gonna throw one in since I've done voltage and continuity testing and and everything else is fine
Thanks for sharing your experience.. You very smart man
@VoltageDropDiagnostics
3 жыл бұрын
Im just a normal tech trying to share the little knowledge that I have lol. Im not smart, I learn from smart people!
Good catch on the differences in the wiring diagrams. Like Ivan said "Great diag".
@VoltageDropDiagnostics
3 жыл бұрын
Thanks Wyatt!
Just got the same car with same problem in the shop, thanks for the video, going to check it out on Monday
@VoltageDropDiagnostics
2 жыл бұрын
Nice!
Thanks. My scanner was telling me to press the skid control button. Couldn't find it. Looking at the diagram i saw an input to the skid control from the Haz switch. I was looking to see if it was a double pole switch. You helped me find the correct diagram.
Thanks for the quick tip PJ.
@VoltageDropDiagnostics
3 жыл бұрын
You bet!
I have the exact issue with my 2014 FJ Cruiser. The FJ forums say it is the turn signal relay. I replaced the turn signal relay. The hazards lights are still on with engine on and engine off. I will try the skid control ECU tomorrow. Thank you for sharing the information.
Great video PJ. Clearly explained!
@VoltageDropDiagnostics
3 жыл бұрын
Much appreciated!
Great video brother , very interesting , iam a Toyota tech too and this is the first time that i see this ! Thnks for sharing , in my country i would directly cut the wire going into that circuit , cuz no one here is going to get a new abs unit for a hazard light always flashing , even removing the hazard fuse and never using them again would be a better solution here .. keep up the good work bro
@VoltageDropDiagnostics
3 жыл бұрын
Hey, what country are you from? I’m interested to know.
@bornforparadise7517
3 жыл бұрын
@@VoltageDropDiagnostics Lol im from mauritania in West Africa , i just replied to one of your videos asking about something that i found during work , where can i contact you , if we can stay in touch !
Thanks for the knowledge brother!
@VoltageDropDiagnostics
3 жыл бұрын
Any time!
Thanks for sharing PJ... Cheers.
@VoltageDropDiagnostics
3 жыл бұрын
You bet
This was so helpful..thank you
Ouch, sucks to not see that in the diagram. At least they should put some dotted lines around that connector to show its incomplete. Thanks for sharing dude, very nice find! I'm going to go look at this diagram as well (Just saw the second diagram, still going to look at the diagrams available to me)
@VoltageDropDiagnostics
3 жыл бұрын
I seen that alldata had a redrawn diagram that also didn't show the skid control circuit. But i did see that alldata had the overall diagram just like toyota SI.
Great find!!
@VoltageDropDiagnostics
3 жыл бұрын
Thanks!
Keep them videos coming!!
@VoltageDropDiagnostics
3 жыл бұрын
Will do!
Great video! What is the part number of the Skid Control Ecu that you replaced?
thank you, my team leader sent me on a goose chase and I looked this video up and helped a lot
Hi PJ, fellow MDT from NJ here! I have replaced two of these already for this same concern. Not super common but they do pop up every now and then. Excellent video explaining how the hazards and skid control ECU are integrated.
@VoltageDropDiagnostics
3 жыл бұрын
Thanks! What part of NJ are you in?
@frankarlocuevas4940
3 жыл бұрын
@@VoltageDropDiagnostics North Jersey. Toyota of Hackensack. I'm a shop foreman there.
Hi, thank you for the video. May I ask if you replaced the abs actuator? to fix the issue or just replaced skid control ecu? thank you again for the helpful video.
Same thing happening to my 05 right now! I just had the ABS brake system replaced 3 years ago
Thanks for the video. Saved me a ton of time diagnosing a 2010 that just came in my shop. I ended up just cutting and taping off the blue wire that goes into the ABS module for the hazard light input and now the car is fixed and hazards work normally. I'm not really sure under what circumstances the brake controller would need to know if the hazards are on. Its not worth thousands to repair though.
@thetahedgecapital1008
Жыл бұрын
Did you cut the wire from under the dash? Or at the connector?
@techwrightauto
Жыл бұрын
@@thetahedgecapital1008 right by the connector under the hood. I tried to leave enough on the connector to splice back if needed. But there have been no issues.
@thetahedgecapital1008
Жыл бұрын
@@techwrightauto Thanks for the swift reply... We are back rolling... Thanks for your help
@lyndonthan4350
Жыл бұрын
I've done that as well. Cut the light blue wire at the ABS/Skid control plug. This stopped the hazards from flashing, but I still have a parasitic draw on the system of some 8 amps. So at first it seemed like it solved the problem, but later on I found the car dead again...Having a hard time finding the parasitic load. I've pulled a lot of fuses but the load remains. ABS Main #2 fuse didn't resolve anything either.
@pensador72
Жыл бұрын
Thank you for all your insight! My connector has 3 blue wires. How do I know which one to cut?
thank u for posting. great diag
@VoltageDropDiagnostics
3 жыл бұрын
No problem!
Wow!! Excellent find!! I’m just thinking if a problem like that came to me. What would or could I do? Hope that PJ would take pity on me.
@VoltageDropDiagnostics
3 жыл бұрын
Luckily I searched in alldata and all of the information was provided in there as well. Just had to dig deep enough.
great video! just got the same issue today with my 2012 Prius :(
@TIMI2011
3 жыл бұрын
I unplugged skid control icu and flushing stopped like yours. Can you share how did you fixed icu issue?
@VoltageDropDiagnostics
3 жыл бұрын
I replaced it on this one.
Great video PJ ! I get stumped on junction connectors sometimes too. I’ll have to check out overall diagrams more
@VoltageDropDiagnostics
3 жыл бұрын
Yeah, lesson learned for me!
Happy new year and while you’re enjoying the long weekend I can’t bring my car in so thought you might be able to give me some peace of mind, or not please be honest… Last night my check engine light came on out of the blue along with the hybrid system warning light - as I was driving I could feel the engine ever so slightly hesitate, so I immediately turned around to go home because it was very very late didn’t want to break down somewhere. Sure enough 25 yards from my parking spot the car stalled hummer engine stopped and I think there was some dinging. I am mediately turned off the car I don’t remember why, maybe it told me to? But then I started it back up and was able to at least drive to my parking spot and left it for the night. The next morning I turned it on same two lights were on, check engine and HSSW… so I turned it back off. Opened up my owners manual to see what it meant couldn’t differentiate between the thermostat and the HSW so I quickly turn the car back on to compare and the check engine light along with it we’re both gone they didn’t come back on. Does this sound like it might be erroneously alerting? I wonder because two weeks ago a red light in the middle of the dash for airbags came on, I ignored it end it too just went away the next day it may have been two days but very quickly it was gone and I completely forgot about it until last night That didn’t have the check engine light with it of course but other than that it seemed like a similar false alert? Do you know I so want that to be what it is as I’m worried about my batteries are some expensive fix but then of course the electrical system can be just as expensive I guess so any unofficial tips or advice you could give as I pull my hair out of my head for the next three days? Thank you very much
I have a similar issue with hazerd lights stuck on but they start to blink faster and faster as the car starts moving? Anything input on that?
Hey PJ, I am working on a 2011 prius with the same issue. I can't get that schematic, so, what's the fix?
Great video. Guess you have to have access to numerous diagrams. Would you recommend if available going to an overall diagram first and then going to a specific wiring diagram? Thanks for the heads up stay well and safe Artie. 😊
@VoltageDropDiagnostics
3 жыл бұрын
After this vehicle, I think that I am going to first look at the overall diagrams first from here on out. I probably spent 45 minutes or more researching that circuit before running into the overall diagram that had more info.
Would be cool to see a video of you programming the new module, if it's required. Did you have to bleed the brakes too or were you able to just replace the electronic portion?
@VoltageDropDiagnostics
3 жыл бұрын
No real "programming" needed. And it would need to have the brakes bled. And thats a pain. Usually takes about 30-45 minutes to bleed these systems after replacing those.
Would Toyota cover this under warranty, being that it’s a internal short in the actuator? mines a 2010 Prius too
great video man! cant we just cut the wire going to the skid control ecu?
Thanks brother!
@VoltageDropDiagnostics
2 жыл бұрын
Thank you!
Same problem here at Toyota dealership, this ones a 2015 but no skid control?
Man it's a little gotta be a little frustrating to realize you can't always trust OEM diagrams! Good job as always, PJ, and thanks for the video!
@VoltageDropDiagnostics
3 жыл бұрын
Yeah, I guess technically I was able to trust the diagram. I just wish the nice interactive diagram showed the entire picture.
Great video , we had a Toyota auris with exact same fault . New abs ECU with actuator was needed making it very expensive. Just quick question regarding input,output signal from abs ECU ,would this make hazards warning lights flash in emergency stop ? also would it be safe to remove this wire from abs ecu ? I've not seen any bulletins (tsb)for this fault ,even though it's more common than you think .
@VoltageDropDiagnostics
3 жыл бұрын
That question is one that I dont have an answer for! You might be right about the hazards light coming on during emergency stops! Ill need to dig into one and see why.
Those zany turd gen prii... Nice work, as always, PJ.
@VoltageDropDiagnostics
3 жыл бұрын
Thanks!
hello thank you very much for your video because it helped me to identify the fault. Please can you tell me what color is the cable that can be cut in the connector of the ABS module. Thank you
@VoltageDropDiagnostics
2 жыл бұрын
Off the top of my head, i don’t know. Sorry.
Hazard Lights will just start blinking and will not shut off on FJ Cruiser. Had to unplug the Fuse. But there went the turn signals. How do I get these Diagrams for the FJ? Never done anything like this before. Thanks
Is replacing this switch enough I have the same problem. Everything worked great in my car .I repair my car myself. Even the engine itself was replaced this year. In addition, I checked my Toyota prius 2010 battery myself today. It is in very good condition. I have a problem because the car only makes 36 miles. And recently it dropped to 30 m / g. The lights turned on by themselves and I am not able to turn them off until the battery is discharged. What should I mention, what part to get rid of this problem. Everything works great for me. Only the lights are flashing. Sorry for the language. I'm writing from Poland
So is it tve skid control module or broken/ frayed wires from junction plug creating a short to skid control?? Please help!
Nice job thank you for sharing this with us, why the skid controle module need the hazard signal?
@VoltageDropDiagnostics
3 жыл бұрын
Thats a question that I dont know the answer to.
@NurulIslam-bn2rm
3 жыл бұрын
If possible can you please do a video to isolate the hazard signal from the skid control module.
My car have got the same problem please can you tell me what the part call please?
Hi Do you know where is the same plague in Prius 2010 Thanks
Hey, my mechanic called a dealership and they seemed to say that plugging in a new skid control ecu was just the beginning. Is it as simple as plug and play or is it more complicated? Scanning or coding or resetting?
@randyvandyke1
Жыл бұрын
Thanks in advance.
Great video PJ. Do you have a garage where you can fix these issue please?
@VoltageDropDiagnostics
3 жыл бұрын
No, I dont have my own garage. I work in a dealership.
Pat, my prius is a 2010. Is there a difference in the location of the ECU. Also, after you changed the Skid control ECU do you need to bleed the brakes? It would be nice to see or hear how the process works after you unplugged the ECU in the current video. Thank you for solving this nightmare.
@VoltageDropDiagnostics
3 жыл бұрын
Yeah, the brakes will need bled. And they’ll need bled with a scan tool.
@ohtro
3 жыл бұрын
@@VoltageDropDiagnostics Is the ECU for the 2010 the same process and located in the same location as the 2012? All you did was replace the ECU and bleed the brakes and it was fixed?
@VoltageDropDiagnostics
3 жыл бұрын
@@ohtro I’m not 100% sure if they’re in the same location. You might want to look in service information and verify it’s location
@ohtro
3 жыл бұрын
Pat which dealership do you work at? Would love to bring my car to you. I am afraid if I take my car to my local Toyota dealer they wont get it right.
I have Toyota perius 2012plus model then a year ago come same issue and today I got same problem when turn of car still hazard on even if turn of the car. Same problem what is solution.
Is that because in the event of a crash the hazards come on? Also do you (or intend to) post your vids on other platforms like Odysee or Bitchute? Thanks!
@VoltageDropDiagnostics
3 жыл бұрын
No, this vehicle wasn't in an accident. At least as far as I am aware. I haven't heard about odysee or bitchute. This is the first that I am hearing about them! I will look into them.
@danlarkin2181
3 жыл бұрын
He means if the vehicle crashes the hazards auto come on as a warning to other drivers.
@VoltageDropDiagnostics
3 жыл бұрын
@@danlarkin2181 i wonder why it wouldn’t head to the airbag module for that. But it makes sense
What I got from this was that the skid control ecu needs to be replaced. What you said in a comment was that you replaced the flasher relay. And then bled the breaks with a scan tool. Did I get that right? Thanks so much.
@VoltageDropDiagnostics
Жыл бұрын
Skid control ecu needed replaced
@randyvandyke1
Жыл бұрын
@@VoltageDropDiagnostics thank you so much for the quick reply.
Q. I have a 2016 Camry 2.5l and car stalls randomly with codes p0015 p0017. I have diagnosed it on my channel. I decided to replace the timing chain tensioner and oil change. While it ran fine initially it stalled on me as I was pulling in. I heard what sounded like a timing chain rattle or valve train noise and then engine stopped. Turned ignition off and on again and it ran fine. Briefly a message (low oil pressure came on)... I revved it very hard and ended up with a p0016, p300, p0302, p0303, p0304. In your expertise is this a common occurrence? I have experienced similar issues with the 2.5l engines. Is there a TSB about it? What are the common fixes? Thanks bro
@PineHollowAutoDiagnostics
3 жыл бұрын
hmm very strange. Has it been maintained properly with synthetic oil changes? Definitely sounds like a timing problem.
@Usmanthemecano
3 жыл бұрын
@@PineHollowAutoDiagnostics it's a salvage vehicle with less than 50k miles. I did replace the oil with toyota 00-20w. I do not have the vehicle maintenance history. I did a capture of cam and crank. When compared to a known good it was identical. But that was before the tensioner change and p0016. So I'm planning to do another capture to see whether it's still in time. The owner states that it's running fine though the CEL is on.
Weird I pulled ABS main fuse one and the lights flashed when I moved but when I turned the car off the flashers turned off this time what does that even mean?
@adamhonda98
3 жыл бұрын
I replaced the flasher relay and it fixed the problem
Any other reasons why they would just randomly come on?
What was the issue causing the hazards to stay on? Whats the name of the part that goes bad and is it purchasable/fixable?
@VoltageDropDiagnostics
2 жыл бұрын
I didn’t mention it in the video?
But how did you fix it?
@VoltageDropDiagnostics
2 жыл бұрын
Magic!
@kami009
2 ай бұрын
Don’t bullshit us with the video if your not going to get us a solution
Need help hazards lights not switching off on Toyota Alphard 2003 model
I am having the same problem on my 2010 but it looks different under the hood than the 2012 any suggestions..
@VoltageDropDiagnostics
2 жыл бұрын
It’s going to be about the same between 2010 and 2012
@techwrightauto
Жыл бұрын
You probably need to take off the wipers and cowling to see the ABS module and plug that are in the video.
thanks bud
@mikeballen
10 ай бұрын
TOOK DOWN, TO THE TOYOTA DEALER. I MENTION CUT THE YELLOW WIRE INSIDE CAR ,OR CUT THE BLUE WIRE IF ON THE FIREWALL , IF UNDER 200 BUCKS CHANGE IT, IF UNDER 1000 BUCKS ASK ME, YA OR NA. OVER 2000 BUCKS . I CAN BUY ANOTHER USED 2012 , FOR PARTS. THE GIRL PULL ME OFF TO THE SIDE , THE PART WILL TAKE SOME TIME .WE CAN GO WITH OPTION 1 CUT THE YELLOW WIRE. CUT IT... BAD THING I GOT A COUPLE LIGHT ON, WHO CARES. SKIT,,BRAKE, ABS ,CIRCLE AND ! ..... NOW I CAN HEAR MY HAWAIIAN GIRL DANCING NOT THAT BLINKING SOUND . WAS LIKE A HAMMER . AND THE BLINKS LIGHTS . WHEN I STOP . HAD TO POP THE A POS SIDE. THER IS A TRICK TO LOCK THE DOORS. THERE ALWAYS LIGHT ON IN THE PRIUS. NOW I CAN TELL THE DIFFERANCE BETWEEN PRIUS AND PRUIS PLUG IN
@mikeballen
10 ай бұрын
DIFFERANCE BETWEEN PRUIS AND PRUIS PLUG IN ONE MONTH. MY LIGHT BILL IS TODAY 09/13/2023. FOR ONE MONTH OF DRIVING MY PRIUS $37.90 FOR 10 GALLONS AFTER A MONTH, COST. PRIUS PLUG IN $37.90 10 GALLONS 45 + MILE PRIUS, PRIUS PLUG IN 55 + .. DRIVE ABOUT THAN 30 MILES LIKE [ IN 15 MINS CITY]. AND 50 BUCKS PLUS IN ELECTRICITY. BETTER TO CHARGE ONCE A WEEK THAN EVER DAY 13 MILE ELECTRIC HAVE FUN AND THANKS
Hi Can you send me the location for the same plague in 2010
Do you like the Mitchell software
@VoltageDropDiagnostics
3 жыл бұрын
Honestly, I haven't used mitchell in years.
I have one question How can I connect my horn to flasher signal because when i lock door the flasher flash but no horn is connected to flasher circuit in Rav4
@VoltageDropDiagnostics
3 жыл бұрын
Happen to notice if one of the doors don’t actually lock? The horn won’t sound unless the door latches send a signal that the doors actually locked. OR there is a customizable feature that turns off the horn with door locks.
@mridware9694
3 жыл бұрын
@@VoltageDropDiagnostics it is without horn sound from the factory but i want to connect horn with the hazard signal so whenever i lock it make peep sound like Altima
@behappy0803
3 жыл бұрын
@@mridware9694 He just gave you an answer above. there is customizable feature so horn make sound when locking and unlocking doors
@mridware9694
3 жыл бұрын
@@behappy0803 how we can use that feature in 2013 Rav4
Is there a fix?
Wow.. Like you said "This wire diagram is completely incomplete.!" Lol That sucks bro, They could have at least thrown some dots around that connector so you would know there's more to that connector. Wonder how this would look from another service diagram.? Hmm...I might have to look at that. Great work bud. Now every time I see a Prius with it's hazards on, I'm gonna think of you and that dang Skid ECU. 🤣🤣 Cheers Brother and thanks for sharing.
@VoltageDropDiagnostics
3 жыл бұрын
"completely incomplete" hahaha I was going to say "completely wrong" but mid sentence I realized that it wasnt an accurate statement hahaha
@exmotorsports
3 жыл бұрын
@@VoltageDropDiagnostics Lol... Its all good. Dam near made sense really. 😂 Keep up the great work you do. Appreciate the videos bro. Cheers
My parents are giving me their 2011 Chevy HHR and one of its problems is the four ways just come on in the middle of the night and kills the battery
Could a bad ground wire have caused this issue?
@VoltageDropDiagnostics
3 жыл бұрын
It’s possible, but unlikely
I’m having the same symptom with my 2013 Chevy equinox
@VoltageDropDiagnostics
3 жыл бұрын
I wonder what is wrong with it.
You didn't tell consumer view to fix it. I just had my turn signal flash on immediately turn off while just standing near car . why
I ran into this one. The flashers would flash faster when driving!
@VoltageDropDiagnostics
3 жыл бұрын
I heard about that from a couple other techs! They also mentioned that there was a rear speed sensor code as well.
@ohtro
3 жыл бұрын
Darryl, did you find a fix for the turn signals speeding up when driving? Will replacing the skid control ECU work for that issue as well? Also do you know where the Skid Control ECU is located in a 2010 prius?
@darrylpalma8784
3 жыл бұрын
@@ohtro I had the same problem with the hazard lights flashing on their own and it would also flash faster when I drove it. The skid control fixed it. It’s under the cowl. I believe it’s all one assembly with the master cylinder and brake booster if I remember correctly. I also think it might have had an updated part number for another known issue. I had mine a couple years ago.
@ohtro
3 жыл бұрын
@@darrylpalma8784 what was the year of your prius? I have a 2010 and in the video it was a 2012. I just wondered if the skid controlwas in same place.
@darrylpalma8784
3 жыл бұрын
@@ohtro I don’t remember what year I had but I’m pretty sure in a 2010 it’s in the same place. You won’t be able to see it until the cowl is out of the way.
It would be a output to the hazards not an input from the switch.. guess that’s not why they are linked
@VoltageDropDiagnostics
3 жыл бұрын
Know why the ABS module turns on the hazard lights?
@allendib4855
3 жыл бұрын
I have a 2010 vw passat and once i had to stop real hard and noticed that the hazard lights came on automatically. It doesnt do that every time the abs activates... only during hard decceleration. So maybe it will ground the circuit if it detects hard decceleration to warn other cars
@VoltageDropDiagnostics
3 жыл бұрын
@@allendib4855 I’ll need to try that!
HOOOOOOOW TO FIXXXXXXXX?????????
Yoh shit ain’t quick …. Stop posting