Toyota

Have Toyota Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Toyota
This answer was rated:

The other day I used my tow dolly with my Prius for the first

time. After I drove the...
The other day I used my tow dolly with my Prius for the first time. After I drove the Prius off the dolly, my MFD, radio, Park Button light, and accessory ports no longer worked. I don't believe the MFD itself is the problem (although the Prius is a 2004, the MFD is actually model 081, the latest one, so it's probably been changed already?), and that wouldn't likely explain the power port failure. I have checked all the fuses (the accessory port fuses are fine), to no avail. Is there a main power lead or something I can check?
Show More
Show Less
Ask Your Own Toyota Question
Answered in 30 minutes by:
7/21/2010
Toyotapro
Toyotapro, ASE master tech
Category: Toyota
Satisfied Customers: 9,974
Experience: ASE Certified, 10+ years Lexus and Toyota Certified
Verified

Hello and thank you for using just answer!

You said it was on a tow dolly.....so just the front 2 wheels were off the ground correct?

Was anything plugged into the Prius while it was being towed or did you have external lights held to the car from your tow vehicle?

Ask Your Own Toyota Question
Customer reply replied 7 years ago
Just 2 wheels off the ground, yes. As far as I know, this is a valid way to tow the vehicle. Nothing else plugged into the vehicle. I use the dolly lights, as well as magnetic tow lights.

Interesting. I assume you had the keys OUT of the car so nothing could power up correct?

Have you checked the battery and also the fuses yet?

Any hybrid warning lights or check engine lights on when is "ready" mode?

Ask Your Own Toyota Question
Customer reply replied 7 years ago

I did have some extraneous warning events such as ABS, !, etc., but they went out shortly after the car was started...... I'm wondering about the auxiliary battery? I have checked the fuses and I can't seem to find a blown one. I have an appointment with Toyota tomorrow, but they are $115 per hour :(

 

I have to step out for about 10 minutes, so there will be a short delay in my next response....

That is ok, I will be monitoring here for the next couple hours.

I would check all fuses here first, I assume you know there are 2 fuse boxes correct? There is the one behind the driver headlamp under the hood and then there is the one under the drivers side dash behind where the hood release handle is at, you need to check all fuses here first.

The second thing I would have checked is the auxilary battery, these AGM batteries can really screw with the electronics when the battery is nearly dead.

Ask Your Own Toyota Question
Customer reply replied 7 years ago

yup, I am aware of the 2 fuse boxes (3 actually :) - the one in the back ).... I have checked all fuses, but I will check them again.

 

I am very aware of the anomolies of AGM Batteries. In addition to having a Ph.D. in Aerospace Engineering, I am also a master certified RV technician, and AGM are the preferred power supply of choice there :)

 

 

very good.

The third in the back I did not mention because it is basically the main power source supply, if those maxi fuses were an issue then you would have bigger problems with the car.

The AGM batteries work in the Prius a little different then they would in an RV because yoru Prius has a acdc converter and when the voltages spike around it can shut every thing down.

Test that AGM battery and also disconnect the battery for about 10 minutes to completely reset the multiplex communication system and retest the car.

If it needs a batttery they are about $130 at your dealer.

Toyotapro
Toyotapro, ASE master tech
Category: Toyota
Satisfied Customers: 9,974
Experience: ASE Certified, 10+ years Lexus and Toyota Certified
Verified
Toyotapro and 87 other Toyota Specialists are ready to help you
Ask your own question now
Customer reply replied 7 years ago

I know it wouldn't be the main breakers in the back, but there ARE 3 fuse boxes, which was my only point :)

 

I will test the battery for sure, and I was going to do that before I contacted you, but I just wondered if there was a power harness or something that I was missing...

 

I dunno, I've seen some pretty freaky things happen to coach batteries when the converter flips out :) :)

 

is the battery relatively easy to access?

Battery access is easy, just pull out the spare tire and the surrounding panels, it sits on the fender in the back cargo area passenger side.
Ask Your Own Toyota Question
Customer reply replied 7 years ago

Okay, I'll go ahead and check that, thanks.....

 

Any other ideas? Do you agree that it's probably not the MFD?

 

Most likely not the display, if that was the issue you would not have those other symptoms as well, the issue you describe is a power source issue.

We have seen the IG1 relays freeze on these but it's too warm out right now for that to be an issue.

Ask Your Own Toyota Question
Customer reply replied 7 years ago

what about the 30A relay marked "Power" on the front of the body ECU? If the battery tests okay, is it worth pulling the fuse box relays individually and checking them (the related ones of course)

 

How do you know it's not really cold where I live.... I do live in Canada after all :)..... Just kidding, it's about 23 degrees C today (well over 70F)

 

Yes, at first I wondered if it might be the MFD because I'm a pessimist and it's a 2004, but then I thought about the symptoms and realized it's likely a power issue, but that would normally point to a fuse....... or a bad AGM :)

I know you are an engineering genius so your mind works much different then mine and you can easily overcomplicate this when the problem is simple but don;t get ahead of yourself.

You would have to have a major short for one of those 30 amp power fuses to blow, it that was the case then you would have bigger issues. Follow what we discussed above first.

You seem paranoid about the displays for some reason......I am the hybrid specialist at my dealer and honestly I just have not seen issues on the generation 2 prius displays.....generation 1 was a piece of junk but these are actually good cars.

( the odometer does max out at 299,999 miles I did find out however.....)

Ask Your Own Toyota Question
Customer reply replied 7 years ago

Well, I don't know about genius, but I guess you have to analyze everything in order to design moon landers and space vehicles and the like :) Takes a different thought process for sure..... I'm great at troubleshooting complex systems, but do tend to overanalyze more simple ones sometimes.... but not always..... this one I obviously did....

 

Alright, I will place even money on the battery and will check it tomorrow. I might as well let the dealership replace it I guess.

 

thanks for your help! :)

Ask Toyotapro Your Own Question
Toyotapro
Toyotapro
Toyotapro, ASE master tech
Category: Toyota
Satisfied Customers: 9,974
9,974 Satisfied Customers
Experience: ASE Certified, 10+ years Lexus and Toyota Certified

Toyotapro is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

THANK YOU, THANK YOU, THANK YOU!! I've got my baby back. Tomorrow I will get a tank of high octane, remove the top, go for a long long ride and enjoy my car. THANK YOU!

JugheadUSA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

Chris (aka-Moose)

Chris (aka-Moose)

Auto Technician

1,001 satisfied customers

16 years of experience

Marty

Marty

ASE Certified Technician

180 satisfied customers

ASE & Bosch Master Tech. 30 years experience.

Amedee

Amedee

Toyota Technician

1,229 satisfied customers

ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector

Anthony

Anthony

ASE Certified Technician

401 satisfied customers

ASE Master Automobile Technician with over 20 years exp. in this field.

Richard

Richard

ASE Certified Technician

9 satisfied customers

Toyota tech. ASE Certified Technician

Skyvisions

Skyvisions

ASE Certified Technician

12,737 satisfied customers

Toyota Master Diagnostic

Genchi Genbutsu

Genchi Genbutsu

Toyota Master Technician

3,761 satisfied customers

Toyota Certified Master Diagnostic Technician, ASE Master Technician with L1 Advanced Engine

< Previous | Next >

Related Toyota Questions
Check engine light on 2010 Prius, On steady. It's extremely
On steady. It's extremely cold here, and the engine has been knocking badly when first started. Then it knocked at stoplights. Then the light came on. … read more
ted ritter
ted ritter
Team Leader/toyota master tech/retired
High School or GED
2,692 satisfied customers
Toyota prius will not start. Get malfunction in parking
toyota prius will not start. Get malfunction in parking brake message. Vehicle is now in parking lot half mile from my home … read more
Boxer54
Boxer54
Line Technician
2 years university - did not gradua
1,563 satisfied customers
Engine on my 2011 toyota prius siezed burned oil. needed an
engine on my 2011 toyota prius siezed burned oil. needed an oil change and I did not do it quickly enough. … read more
Toyota Service
Toyota Service
Toyota Dealership Service & CR Manager
1,344 satisfied customers
2007 Prius wont start now that I put a new engine in.
2007 Prius wont start now that I put a new engine in. … read more
mike switzer
mike switzer
691 satisfied customers
We are looking at a 2012 Prius that is in pristine
We are looking at a 2012 Prius that is in pristine condition. Carfax info shows it was a lease car for the first year of life, and then it was bought at auction and sold locally here in Twin Falls, ID… read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
4,433 satisfied customers
Prius won't start. Yellow triangle with exclamation. Prius
Prius won't start. Yellow triangle with exclamation mark … read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
4,433 satisfied customers
Prius parked but can't turn engine off and key stuck.
Prius parked but can't turn engine off and key stuck … read more
Daniel Lee
Daniel Lee
Lead Automotive Technician
Automotive Technology
32 satisfied customers
Prius won't start but power does come on. Where is the
Have done nothing yet just discovered this.i am not near a repair shop … read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
4,433 satisfied customers
Just did an engine swap on a 2012 Toyota Prius V. Car will
Just did an engine swap on a 2012 Toyota Prius V. Car will go into aux mode but won't actually start with the new gas engine. Is there something extra I need to do? Maybe erase codes and if so how? Ol… read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
4,433 satisfied customers
Toyota Prius** My 05 Prius acted up while I was on the
Toyota Prius** My 05 Prius acted up while I was on the highway recently. The odo suddenly went away and the red hybrid system light went on. It felt like the car 'disengaged' and wouldn't run despite … read more
Skyvisions
Skyvisions
ASE Certified Technician
High School or GED
12,737 satisfied customers
I have prius 2008, replased the engine, car wont start, it
Hello, i have prius 2008, replased the engine, car wont start, it says … read more
Gunvir Singh
Gunvir Singh
1,817 satisfied customers
I own a 2013 Prius and for the past week, the check engine
Hello. I own a 2013 Prius and for the past week, the check engine light will come on sporadically, as well as the engine shakes (usually right after startup or idling at a stoplight) for about 10-15 s… read more
Eric
Eric
Auto Technician
589 satisfied customers
2005 Prius: I replaced a engine, making sure all hoses and
2005 Prius: I replaced a blown engine, making sure all hoses and electric connections were done. … read more
Shawn Few
Shawn Few
AS
70 satisfied customers
Prius starts in accessory mode with warning light engine not
Prius starts in accessory mode with warning light engine not starting … read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
I have a 2008 Prius and the red triangle, check engine, VSC
I have a 2008 Prius and the red triangle, check engine, VSC and brake system warning light just came on … read more
ted ritter
ted ritter
Team Leader/toyota master tech/retired
High School or GED
2,692 satisfied customers
My '08 Prius engine will not start. Tried it three times and
My '08 Prius engine will not start. Tried it three times and everything turned on except the engine and the dash (engine light popped on). After a minute the engine started and but the dash light stil… read more
Skyvisions
Skyvisions
ASE Certified Technician
High School or GED
12,737 satisfied customers
Drove my 2007 Toyota Prius home and engine won't shut off
Drove my 2007 Toyota Prius home and engine won't shut off and unable to remove key/fob from slot. How do I shut off the engine? … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
2008 Prius with a code C1300 Malfunction in Engine Control &
2008 Prius with a code C1300 Malfunction in Engine Control & code P0420 Catalyst system efficiency below threshold bank 1 … read more
ted ritter
ted ritter
Team Leader/toyota master tech/retired
High School or GED
2,692 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x