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Dome light, key fob, clock, no radio, VSC

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by paul2102, Nov 4, 2018.

  1. dolj

    dolj Senior Member

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    To all you people who do not drive their Prius much, buy a battery maintainer and use it every time the car is laid up.. 12 V battery problems will go away and your 12 V battery will last much longer.

    Get a modern automatic with AGM detection (or switchable) that charges 4-5 Amps and has a quick attach pigtail that you can permanently connect to the 12 V battery terminals. You should find something that meets that criteria for less than $50.
     
  2. paul2102

    paul2102 Junior Member

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    Can you suggest a particular maintainer?
     
  3. dolj

    dolj Senior Member

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    The reason I gave a critera list is that I can't really recommend a particular product, as I'm not that familiar with what is available on the US market.

    The only only one I can personally recommend is the CTEK MXS 5.0 which is what I use.

    However, I have seen others recommend a Harbor Freight charger and also I have seen people recommended
    CTEK MUS 4.3, Schumacher 1000A-CA and Schumacher 1500A-CA. I don't have an opinion on them but would be happy to try any of them.

    Also, in addition to what I said previously:
    Make sure that you do not get a trickle charger (or battery maintainer), but one that is a proper charger that will go into a maintenance cycle after charging. This way you get the best of both worlds.

    I just re-read my OP and want to expand/clarify this part (as editing the post is now not possible):
    I should have said: buy at least a battery maintainer, which is good for keeping a relatively fully charged battery full, but even better get a proper charger that goes into a maintenance cycle once the battery is fully charged, and use it every time the car is laid up.

    The way it was written made it a bit contradictory to later advice. Sorry about that.

    Hope that helps.
     
    #23 dolj, Jan 30, 2019
    Last edited: Jan 30, 2019
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  4. Szab Laci

    Szab Laci New Member

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    My 12V battery is new ! I think it may be a problem elsewhere!
     
  5. Szab Laci

    Szab Laci New Member

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    Hi ! You've solved the problem ? is the car okay ?? thanks
     
  6. paul2102

    paul2102 Junior Member

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    The car has been stored in a garage all winter. I had to jump it to get it started and now it starts but of course has the same problems. The battery is 6 years old and I plan on driving the car over to my Toyota dealer for a new one. Thanks to everyone for all the advice. I believe a new battery will solve the problems.
     
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  7. paul2102

    paul2102 Junior Member

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    Need your help again, just installed the new battery, measures 13.9 to 14 volts.
    The car starts, but back to the same original problem. No dome light, clock, radio, VSC can't open hatch. Key fob doesn't work.
    Where to next??
     
  8. Knightrider

    Knightrider Member

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    I have this exact same issue.
     
  9. TMR-JWAP

    TMR-JWAP Senior Member

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    DOME fuse? Just guessing, since I don't have my drawings available right now.........
     
  10. paul2102

    paul2102 Junior Member

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    Never mind, Got the red triangle, hybrid battery wouldn't charge, and started making loud fan noise.

    I just sold it to a dealer, problem gone.
     
  11. Knightrider

    Knightrider Member

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    ANYONE HAVE INPUT ON THIS>

    I have replaced relays- all fuses underhood and in fuse area at drivers foot
    I am beginning to wonder about Body ECU.....
     
  12. BabyBluePrius

    BabyBluePrius New Member

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    I have the same exact problem. I Checked fuses. Put in new 12v battery. At first all the electrical issues would come and go. Now all the issues have been constant for about a month. Car drives fine but no Radio, interior lights, clock, smart key doesn't work, VSC light is on. I believe all of these things are on the same line. My fuse is good so I was thinking broken wire or bad connector. I see a few posts with these same symptoms but no answer to the problem. My car has like 310000 miles so it owes me nothing but I do miss the radio and having to unlock the door using the actual key. Any ideas are appreciated
     
  13. Patrick Wong

    Patrick Wong DIY Enthusiast

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    Let's start with the clock. It receives power from three fuses: 7.5A PANEL, 7.5A ACC, and 15A DOME. Check all three fuses by removing each and measuring continuity with an ohmmeter.

    Also, measure voltage from the fuse socket terminals to ground. You should be able to measure 12VDC from one of the terminals to ground, with the ACC fuse removed, while the car is IG-ON or READY. The DOME fuse should have 12VDC at the socket regardless of whether the car is IG-OFF, IG-ON or READY. The PANEL fuse should have 12VDC when the exterior lights are turned on.
     
    #33 Patrick Wong, Apr 23, 2019
    Last edited: Apr 23, 2019
  14. Hokie-Dave

    Hokie-Dave Member

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    The dome fuse solved my exact problem. 5 th one up in the fuse box on bottom left row under hood. 15 amp LP fuse.

    SM-N950U1 ?
     
  15. BabyBluePrius

    BabyBluePrius New Member

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    I checked those fuses for continuity with my ohmmeter and all were good but I will check them again along with the voltage you laid out. I appreciate your help and will report back what I find out. thanks
     
  16. BabyBluePrius

    BabyBluePrius New Member

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    I did check this fuse but will check again. Thanks for your reply
     
  17. BabyBluePrius

    BabyBluePrius New Member

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    So I checked the fuses that you recommended and all were good. I also checked the voltage for each one and they all come up with 12vdc. Any idea what my next step is? Do you know if there is some sort of junction box or ecu (like mentioned above) that could be a problem. Any help is appreciated. Thanks
     
  18. Knightrider

    Knightrider Member

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    I am in the exact same boat
    fuses all good. 12v at fuses.
    leads me to think a body control or a wire is cut.... as no door lights/dome lamp
    smart key, radio , dash lamps around smart key
     
  19. Patrick Wong

    Patrick Wong DIY Enthusiast

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    The next step is to measure voltages at the clock to see which wire is broken. Then run new wiring as necessary. Time to get the electrical wiring diagram at techinfo.toyota.com
     
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  20. BabyBluePrius

    BabyBluePrius New Member

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    Im pretty sure the wire that is causing the problems is the one that goes with the Dome fuse. there are people with my same symptoms who end up having a blown dome fuse. Wish I was that lucky. Im hoping I can figure out the wiring schematics. Thanks for your help