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Dan
Dan, ASE Certified Technician
Category: Toyota
Satisfied Customers: 1687
Experience:  Auto Technician
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Installed battery the wrong way, now deosn't start. yes

Customer Question

installed battery the wrong way, now deosn't start.
JA: Will the headlights turn on? Is the battery fully charged?
Customer: yes replaced 100 amp fuse already
JA: What is the model/year of your Toyota?
Customer: before nothing was on now headlights, blinkers, vents windows are on 2007 corolla
JA: Are you fixing your Corolla yourself? What have you tried so far?
Customer: so far replaced a blown 100 amp fuse and kind of stack at the moment
JA: Anything else you want the mechanic to know before I connect you?
Customer: that's all i know :)
Submitted: 8 months ago.
Category: Toyota
Expert:  Dan replied 8 months ago.

Hello my name is***** am an ASE Master Technician and I am glad to help you with your question.

Expert:  Dan replied 8 months ago.

Check all fuses, you probably have more blown fuses, not just the 100 amp fuse. Do the accessories turn on?

Customer: replied 8 months ago.
U still there?
Customer: replied 8 months ago.
Accesorries do turn on, no radio
Customer: replied 8 months ago.
U stil there?
Customer: replied 8 months ago.
Got to go let me know how to contact u
Expert:  Dan replied 8 months ago.

Use a test light to check all fuses. Sounds like you still have blown fuses.

Expert:  Dan replied 8 months ago.

You can message me here. Thanks.

Customer: replied 8 months ago.
im back, sorry
Customer: replied 8 months ago.
are you back here?
Customer: replied 8 months ago.
basically check every single fuse?
what would be your suspect?
Expert:  Dan replied 8 months ago.

Do you have a test light or meter?

Customer: replied 8 months ago.
i have a meter
Customer: replied 8 months ago.
i can test fuses, it is pain to get to them
Customer: replied 8 months ago.
which one do you think would cause this behavior, no cranking but some electricity on in the cabin, lights working, etc
Customer: replied 8 months ago.
hallo, u there?
Expert:  Dan replied 8 months ago.

It could be a few different ones, the easiest to check is with a test light. You can probe both sides of the fuse with the key on. You do not have to remove the fuses. If you have power on both sides fuse is ok, if only one side of the fuse has power, then you found a blown one.

Customer: replied 8 months ago.
can i check it with multimeter?
Customer: replied 8 months ago.
Also how do I check it from the top? No access to the bottom of fuses/ cables
Customer: replied 8 months ago.
would STA fuse be likely next?
Expert:  Dan replied 8 months ago.

Yes you can use a meter, the leads may not be small enough to fit in the hole on the back of the fuse.

Customer: replied 8 months ago.
I checked all the fuses and there were few fried. Now all the main fuses work, there are few that don't but they seem to be head light fuses. Will change them today, but suspicious that only they don't work and there is 5 of them. Still doesn't start. No engine light. When I try to start it everything in the cabin goes dark. I will have battery tested but I doubt this is battery issue.What next?
Expert:  Dan replied 8 months ago.

Use a jumper wire to go directly to the starter solenoid to the battery and see if it turns over.

Customer: replied 8 months ago.
How can I find it?
Expert:  Dan replied 8 months ago.

The starter solenoid is the smallest wire on the starter. I can send you a location from the service manual if you would like.

Customer: replied 8 months ago.
ok, thanks. I will try that.
Expert:  Dan replied 8 months ago.

You're welcome

Expert:  Dan replied 8 months ago.

Let me know what happens.

Customer: replied 8 months ago.
Will do, one more question. Would problem with the starter explain no engine or some other lights on when turn the key?
Expert:  Dan replied 8 months ago.

Sounds like you still have a blown fuses.

Customer: replied 8 months ago.
but all the main once in the engine bay are good. Again only 5 red 10 amp fuses that say head light are bad. everything else I checked multiple times and they look good. 30 amp main is fine, ecu all around main are good. I know it looks like alt 100 amp is blown but I've changed it yesterday. Could it be one of the relays in there? I'm not sure how to check them and which one would be the suspect. Can't believe I connected this battery backwards, I've done it 100's times....
Expert:  Dan replied 8 months ago.

Those fuses that are blown could be powering other things besides the headlight, only way to know is to pull up the power distribution diagram and see which system are powered off of those 5 fuses.

Customer: replied 8 months ago.
im running out of the ideas on fuses. checked all of them. bought new once but they still don't work. checked each of them with the meter and they are fine. there is a relay for head and the same one for something esle. checked both of them, seem fine, swapped them still nothing on those fuses. all other fuses work fine. no engine light. if the fuses are fine what else it could be? ECU?
Expert:  Dan replied 8 months ago.

Does the scan tool communicate with the ECU?

Customer: replied 8 months ago.
I have one for VW/Audi and this one doesn't support Toyota, tried it yesterday. Was thinking about borrowing one from Oraley or place like this.
Customer: replied 8 months ago.
checked butter with the meter and it is fine.
Customer: replied 8 months ago.
battery not butter :):)
Expert:  Dan replied 8 months ago.

This would tell us a lot, because if you cannot communicate you know the ecu it not turning on.

Customer: replied 8 months ago.
will get the tool
Expert:  Dan replied 8 months ago.

ok

Customer: replied 8 months ago.
i will have to wait till saturday to rent one.
Expert:  Dan replied 8 months ago.

Ok, keep in mind that the site will automatically time out the question in 7 days.

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