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Old 03-30-2009, 10:49 AM #1
Hunter Hunter is offline
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Batt drain on Dome Light Circuit on a 2K 4runner

I have a Battery drain on the Dome Light Circuit on my 2000 4 runner.


It will kill a brand new batt in about 2 weeks if the truck
is not started. I load tested the batt to make sure it is OK.

When I pull the Dome fuse the drain stops.

I realize the clock and radio are on that circuit and possibley the alarm. But it should not be draining that much power.


I do not have a wiring diagram and can not figure what is staying on to draw that much.

Anyone seen this or have any suggestions?

Thanks

Last edited by Hunter; 03-31-2009 at 07:23 PM.
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Old 03-31-2009, 07:24 PM #2
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Anyone?
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Old 03-31-2009, 10:25 PM #3
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What all is on the dome circuit? Is there a light in the glovebox, perhaps? Maybe the switch isn't working, and it's on all the time, only you can't see it.
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Old 04-01-2009, 12:17 AM #4
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go to autozone.com and sign up and you should be able to take a look at the wiring diagram. I'm not sure what all is on that circuit off the top of my head.
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Old 04-03-2009, 02:15 PM #5
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I can not open the wiring diagrams at Auto Zone, Is it working for anyone else?

Last edited by Hunter; 04-03-2009 at 04:36 PM.
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Old 04-03-2009, 06:19 PM #6
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Okay, you're on the right track. You have identified the circuit that is causing excessive parasitic draw. Now you have to look at each component and its wiring to determine exactly what is causing the problem. Once you figure out the other things in the circuit, you can set your meter up to read amps and start checking component by component (or even wire by wire) until you discover the exact point of your problem. But first you have to get yourself some wiring diagrams to know where to start.
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Old 04-04-2009, 01:17 AM #7
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There are a couple of options if you can't find the actual drain. You could put a switch in the line just before the fuse. You could just disconnect the battery when you're not driving.
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Old 04-04-2009, 01:50 PM #8
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Quote:
Originally posted by rjyhdc4
There are a couple of options if you can't find the actual drain. You could put a switch in the line just before the fuse. You could just disconnect the battery when you're not driving.
He said that he pulled the fuse already, which accomplishes the same thing as installing a switch or disconnecting the battery. That's not a fix, however, but rather more of a temporary band-aid type of solution.

Simple diagnostic work will lead him to the true source of the problem and allow him to fix it permanently. With a set of wiring schematics, the true problem will be found by anyone with a little electrical experience.
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Old 04-04-2009, 02:36 PM #9
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Thanks,

I am trying to locate a wiring diagram.
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Old 04-05-2009, 07:15 AM #10
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Hi guys, I have a pdf of the dome and radio circuit with the connectors. does anybody knows how I could put them here?
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Old 04-05-2009, 12:28 PM #11
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i found mine from the Toyota tech site as well.... if autozone isn't working PM one of us your email address, and i'll send it over.
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Old 04-05-2009, 01:39 PM #12
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Quote:
Originally posted by EH007
He said that he pulled the fuse already, which accomplishes the same thing as installing a switch or disconnecting the battery. That's not a fix, however, but rather more of a temporary band-aid type of solution.

Simple diagnostic work will lead him to the true source of the problem and allow him to fix it permanently. With a set of wiring schematics, the true problem will be found by anyone with a little electrical experience.
If you read my post I stated "If you can't find the actual drain." In addition, I wouldn't want to remove a fuse and replace it every time I need the dome light...
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Old 04-05-2009, 01:54 PM #13
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Quote:
Originally posted by rjyhdc4
If you read my post I stated "If you can't find the actual drain." In addition, I wouldn't want to remove a fuse and replace it every time I need the dome light...
I did read your post... and he hasn't been able to find the actual drain yet, so he's pulling the fuse. As for what he does in the future, like I already stated, your suggestions aren't a fix, they are just a temperary band-aid, which are similar to what he's already doing.

Besides, if you wouldn't want to remove & replace a fuse every time you needed the dome light, then I'm fairly certain you wouldn't be happy disconnecting the battery every time you needed the dome light either.
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Old 04-06-2009, 11:01 AM #14
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I noticed something yesterday that might be relevent. My '99 4Runner has a sticker inside the engine room fuse box telling the dealer to remove the sticker after installing the dome light fuse which was left off to avoid battery drain. My sticker just never got removed. Seems it is an expected problem?
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Old 12-05-2016, 02:01 PM #15
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New member, been working on a 2000 4Runner limited fixing all sort of gremlins. Anyhow I'm trying to help a friend out and having a heck of a time with a parasitic draw. I have narrowed it down to the dome circuit and even further than that I have narrowed it down to something with the diversity antenna. With the car off and in sleep mode I am getting 0.54 current draw. If I disconnect the diversity antenna (smaller antenna wire) from the back of the stock head unit and allow the ecu to go back into sleep mode the current draw drops to around 0.01 on the 10a scale on my meter. I know I'm on the right track but I can't for the life of me find a schematic on how the diversity antenna is wired or let alon find where that cable goes to or how it could possibly receiving power. Any help guys?
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