Prius (2010-12) :: No Power Until Dome Light Is Turned On
Aug 2, 2014
Have had a 2012 Prius Four for about one year with no problems. Within last several weeks, it started to go dead (no power, but charged batteries) intermittently after normal park and shutoff. Frequency of this issue has increased.
The only way to revive the car seems to be to turn on the rear dome light. Once the dome light is turned on, the Nav screen turns blue saying "System Downloading, do not turn off power" and car starts and runs fine. I've tried to keep track of circumstances when it happens and have not been able to determine any commonalities (hot/cool weather, solar recirculator on/off, short/long trip, dry/wet day).
The battery is charged and appears to maintain a charge as well as when it does restart, the battery is showing good charge 60-90%.
Car clock time will be off by as long as it sat without power (again indicating that the entire car is going dead).
It has happened immediately after turning off (I find out because I can't use key fob or touch to lock the doors).
It has happened while car was unattended (car locked, left and came back several hours later and can't get into car without manual key unlock, clock was off by about the same time I was away from it).
Front cabin lights, pressing brake and power button, headlights, radio, door locks, etc...none of it will re-enable the power. Except the dome light for back seat.
When it's in this no power state, just switch the dome light on and the car comes back to life (still needs started with normal procedure). I didn't believe my wife until I had this happen to me multiple times in the last week as I drove it to troubleshoot it.
What is causing my electrical gremlin. I'm thinking maybe a flaky relay. Makes no sense to me why the dome light would trip something to start up again. Worried that the dome light trick won't work one of these times.
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Gen III base model. I think i read somewhere from the manual saying that the dome light suppose to shut off automatically after 20 minutes. But not in my case. My kids always left the dome light on and I checked one hour later it was still on. Or must be swtich off manually?
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However, I noticed it is only coming on and blinking when I have the key turned to power on, but not when the engine is cranked. Is this just a normal light display? I'm definitely calling the dealer if the oil needs changed already.
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Just got home from work and had to return to my car. Noticed the dome lights did not come on when I unlocked the car with my key. Figured maybe i had turned them off by mistake. Tried to flip the switch over but nothing. Turned the ignition on and the lights came on. Turned them off and on and seemed fine. Turned off the ignition they turned off. I tried trouble shooting the issue. Locked the car with the fob and unlocked. No lights. Turned on and off the car and repeated. Still no lights.
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How to set it up where only the back dome lights turn on when a door is opened? I would like to keep the front ones off and only turn them on by pushing on them. I have a 2013 base prius.
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I have a 2005 F250 with 6.0 Crew cab
Wanted to change out factory bulbs to LED's. The factories were working just fine, just wanted LED's. Broke a couple of center bulb holder's/clamp. Don't really know what they are called. Went to junk yard got a couple of used ones, those worked because when we opened the doors on wrecked trucks Dome lights came on! Got home put them in and NOTHING. No dome, no map lights with LED's. Changed back to factory bulbs and only map lights come on, NO dome lights on front or back and my 3rd brake light quit along with the 2 bed lights. Checked the wiring plug and have power to one wire. What fuses would I need to check or to check where next? Owner's manual is not very specific about which fuse.
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i just installed a Dash Cam and it needs power all the time. Is there a way to tap into the dome light?
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My buddy is selling his truck in a couple days and was taking out speakers, afe intake, and satelite radio. I go to start the truck and i have no power to windows, no power to radio and no domelight when i switch it on and off. Dont know what i did but none of this works and everything else does.
I checked all fused all were good. I searched the forum for a solution and they said something about the automatic delay relay and i bought a new one and nothing still. I am not sure what else to do i checked with voltmeter if i had anypower to the window or radio and nothing. But the radios clock works and when i turn on the light it illuminates but doesnt turn on.
The truck is a 2002 7.3L Crewcab. f350
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I ordered a complete ( almost) set of LED'S from iJDMtoy.
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So I was in the driveway looking in every nook and cranny in the new car.
How do you get the lens off the dome light in the front to switch the bulb to LED?
The lens is part of the switch for the map light.
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How to remove it, the reason is that the mic pop out and the only way to fix it is to removing the dome (map) light.
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