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Old 06-22-2010, 09:36 PM   #1
toystory
 
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Question Electrical Problems PS,A/C,RADIO,SPEEDOMETER,SIGNALS,AIR BAG LIGHT ON, ALTERNATOR

2006 Yaris Vitz 38 km....

About a week ago I used my Yaris and when I turned the car ON, the Power Steering light was ON. The Steering Wheel got really hard to make a turn. A/C wasn't working also, Radio, Signals and Speedometer were not working. Airbag light was also ON. Alternator was not charging when that happened. Yaris did turn ON and I drove it home that way which was about a 15 minute drive. When I got home and parked, before I turned OFF the car it started working fine again. The next day it did it again, when my wife wen't out and it worked fine until she turned it OFF, when she turned it back on, it did everything again so my wife turned it OFF right away and back ON and it was normal again, so she came home. The third time it did the same thing again, it cut off what I mentioned earlier. I took the Alternator OFF, took it to a place to be checked and they told me the Alternator was working fine and the Regulator! I installed the Alternator in the Yaris and it turned on fine so I haven't used the Yaris until I find out what's going on with the Electrical Problem it has.
Please, if anyone has had this similar problem or knows what the problem might be help me out, I don't have a Warranty or Guarantee from a dealer because I bought the car on the street! Thank You.
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Old 06-22-2010, 10:09 PM   #2
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Quote:
Originally Posted by toystory View Post
2006 Yaris Vitz 38 km....

About a week ago I used my Yaris and when I turned the car ON, the Power Steering light was ON. The Steering Wheel got really hard to make a turn. A/C wasn't working also, Radio, Signals and Speedometer were not working. Airbag light was also ON. Alternator was not charging when that happened. Yaris did turn ON and I drove it home that way which was about a 15 minute drive. When I got home and parked, before I turned OFF the car it started working fine again. The next day it did it again, when my wife wen't out and it worked fine until she turned it OFF, when she turned it back on, it did everything again so my wife turned it OFF right away and back ON and it was normal again, so she came home. The third time it did the same thing again, it cut off what I mentioned earlier. I took the Alternator OFF, took it to a place to be checked and they told me the Alternator was working fine and the Regulator! I installed the Alternator in the Yaris and it turned on fine so I haven't used the Yaris until I find out what's going on with the Electrical Problem it has.
Please, if anyone has had this similar problem or knows what the problem might be help me out, I don't have a Warranty or Guarantee from a dealer because I bought the car on the street! Thank You.

Other than the alternator, with that broad of an issue, I would check the battery. If you have a volt meter, take some voltage measurements (off, running at idle, and at about 3000 RPM).
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Old 06-23-2010, 10:56 AM   #3
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The Yaris battery is good even, with the problem, the car still turns on. The Alternator has also been checked as I mentioned earlier.
I wanted to know if the Alternator is controlled by the ECU.....
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Old 06-23-2010, 12:13 PM   #4
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The Yaris battery is good even, with the problem, the car still turns on. The Alternator has also been checked as I mentioned earlier.
I wanted to know if the Alternator is controlled by the ECU.....
No. It's not controlled by the ECU, but it puts out a pulsed signal to the ECM, the AC ECU, and the DRL to let them know if the alternator is generating power. That output signal is a function of the voltage regulator. The alternator could be generating power, but if that signal is being generated, then the ECM and the other systems that use that signal wouldn't think that it was. You'd need an oscilloscope to check for that signal.

Last edited by CTScott; 06-23-2010 at 09:04 PM.
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Old 06-23-2010, 05:57 PM   #5
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Thanks for the info. I'm gonna try to figure out what's going on, I don't have much experience but that's what threads are for. TY!
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Old 06-23-2010, 06:06 PM   #6
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Add any new electrical/electronic items lately? If not, I'd still look at the alternator. I've had alternators test out as being good when they weren't. Auto parts store told me it was good and out of desperation I replaced it anyway and it fixed the problem. It wasn't on my Yaris but the symptoms were similar.
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Old 06-23-2010, 06:44 PM   #7
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Have you checked your fuses?
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Old 06-23-2010, 07:59 PM   #8
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First off when did the problem accure? Did you have some work done to the car that needed some cables installed? Did you buy the vehicle used? The fuse box should be checked, and the battery as well, if the car runs its not the alternater, has to be the battery it might be low in charge.
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Old 06-23-2010, 08:49 PM   #9
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Quote:
Originally Posted by toystory View Post

Yaris cut off PS. PS Light turned on, also got hard to turn, also cut off signals, a/c, radio, speedometer, and alternator. Everything at the same time! Air bag light also turned on. Car turns ON with everything mentioned above CUT OFF. Alternator has been checked and it's good and also regulator is good. If anyone has a similar problem let me know.
Blown main fuse will make your dash light up like a christmas tree. I believe its attached to the power wire on top of the battery. I would check that first. Do you have any aftermarket equiptment such as a high powered stereo?

If it looks good when starting the car see if the check engine light completes its bulb test and turns on for a few seconds and then goes off. If it never lights up then that indicates a issue related to the computer.
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Old 06-23-2010, 10:54 PM   #10
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I checked both fuse boxes. The battery is good, the car turns on because the battery is still charged. It hasn't gone dead.
I wan't to know that if in a normal working car, a person disconnects the alternator, the car is gonna cut off PS, SPEEDOMETER, SIGANALS, RADIO, A/C, AIRBAG LIGHT WILL BE ON? JUST A CURIOSITY! TY....
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Old 06-23-2010, 10:58 PM   #11
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Originally Posted by bst82551 View Post
Have you checked your fuses?


CHECKED ALL FUSES....
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Old 06-23-2010, 11:03 PM   #12
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Originally Posted by big lo View Post
First off when did the problem accure? Did you have some work done to the car that needed some cables installed? Did you buy the vehicle used? The fuse box should be checked, and the battery as well, if the car runs its not the alternater, has to be the battery it might be low in charge.

IT OCCURED ABOUT A WEEK AGO THREE TIMES. NO WORK WAS DONE FOR ANY NEW CABLES. YES, THE CAR WAS BOUGHT USED 2 YEARS AGO AND I NEVER HAD ANY PROBLEMS. BOTH FUSE BOXES WERE CHECKED. TY!
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Old 06-23-2010, 11:05 PM   #13
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lemme guess, your electrical problems started right after you replaced your failed water pump....riiiiight.
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Old 06-23-2010, 11:13 PM   #14
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Add any new electrical/electronic items lately? If not, I'd still look at the alternator. I've had alternators test out as being good when they weren't. Auto parts store told me it was good and out of desperation I replaced it anyway and it fixed the problem. It wasn't on my Yaris but the symptoms were similar.
I only put a month and a half ago, 2 bulbs (lead) in the front for the signals and thats about it.
I wan't to know that if in a normal working car, a person disconnects the alternator, the car is gonna cut off PS, SPEEDOMETER, SIGANALS, RADIO, A/C, AIRBAG LIGHT WILL BE ON? JUST A CURIOSITY! TY....
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Old 06-23-2010, 11:15 PM   #15
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lemme guess, your electrical problems started right after you replaced your failed water pump....riiiiight.
no water pump replaced.
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Old 06-23-2010, 11:27 PM   #16
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Originally Posted by toystory View Post
I only put a month and a half ago, 2 bulbs (lead) in the front for the signals and thats about it.
I wan't to know that if in a normal working car, a person disconnects the alternator, the car is gonna cut off PS, SPEEDOMETER, SIGANALS, RADIO, A/C, AIRBAG LIGHT WILL BE ON? JUST A CURIOSITY! TY....
I'll try it on Crashy tomorrow morning and let you know.
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Old 06-24-2010, 12:13 PM   #17
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OK - I just finished doing some testing on Crashy and could not recreate the issue. I disconnected the alternator output (the large gauge wire going to the battery) and separately the alternator "signal" output (the 4 pin connector that gives the ECM, AC ECU, etc. info about the alternator state). In both cases Crashy started and ran fine, and everything worked (power steering, etc.)

So, based on that and my experience with us having a plant in Humacao, PR for a few years (and seeing things corrode like crazy even indoors), I would look at connector A27, which is the large black connector with a black and a white wire. It connects to the fusible link (the large plastic chunk attached to the positive battery terminal). The white wire supplies power to all of the body ECUs (AC, Power Steering, SRS, etc.)

A27 Battery Connector.jpg


I would also check the other end of that white wire, which is a ring terminal (connector 1D), which is located on the bottom of the under hood fuse panel.
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Old 06-24-2010, 12:29 PM   #18
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Originally Posted by CTScott View Post
OK - I just finished doing some testing on Crashy and could not recreate the issue. I disconnected the alternator output (the large gauge wire going to the battery) and separately the alternator "signal" output (the 4 pin connector that gives the ECM, AC ECU, etc. info about the alternator state). In both cases Crashy started and ran fine, and everything worked (power steering, etc.)

So, based on that and my experience with us having a plant in Humacao, PR for a few years (and seeing things corrode like crazy even indoors), I would look at connector A27, which is the large black connector with a black and a white wire. It connects to the fusible link (the large plastic chunk attached to the positive battery terminal). The white wire supplies power to all of the body ECUs (AC, Power Steering, SRS, etc.)

Attachment 34677


I would also check the other end of that white wire, which is a ring terminal (connector 1D), which is located on the bottom of the under hood fuse panel.
I'm gonna check as soon it stops raining and i will let you now.... ty! It won't be long.......
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