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ECU-B Dome Fuses

The circuit that runs through this fuse is draining the battery

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: engine not starting

7.5 amp fuse drivers side kick pannel

Posted on Aug 19, 2008

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SOURCE: Battery dies after 2 days of non-use. Checked

it would take about 350 hours to kill your battery at 200 ma leakage .. between the computer, radio and anything else that has "keep alive" conditions .. i would think 200ma is maybe on the high side of normal .. to kill the battery in 2 days would require a continuous drain of more than 1.5 amps .. that would be about what the trunk light or under hood light would draw .. make sure those are going off .... alternator diodes can have leakage thats very high .. of course if you are measuring the leakage current right at the battery connector then all leakage sources should be included in the reading .. if its only 200ma then you might have a bad battery (low on water or sulfated) .. Pb acid batteries are easily ruined by leaving them discharged for a while .. and the maintainence free types can only handle a few deep discharges .. .

Posted on Jul 13, 2009

morse008
  • 1111 Answers

SOURCE: 1990 Toyota Camry has electical short

with the aid of a test light disconnect the negative terminal to the battery and connect one end of the test light to the battery and the other end to the terminal cable if its lit there is a draw begin by pulling 1 fuse at a time until the light goes out and that's the draw most likely a glove-box switch not making full contact or a trunk switch even the dome light adjust the switch as necessary either try a shim or possibly bend the fixture forwards or remove the bulb all together if you desire

Posted on Sep 23, 2009

  • 1374 Answers

SOURCE: I have a slow battery

It might be shorted to another circuit. Does ammeter read below 0.30 amps. Sounds like its shorting between door-ajar and radio. You have to back probe circuits until you find the short.

Posted on Sep 23, 2010

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1 Answer

Courtesy circuit draining the battery over night. I check the dome lights at night looking through the windows, no lights were on. including the sun visors


There are many circuits that can draw power when the key is off. The way to find out which circuit is drawing is to connect an ammeter to the battery and then pull fuses until you find the one that cuts the current. Then check the devices on that circuit.

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My dome light on 2009 ford 250 xlt does not work. all fuses are good


Dome light works on a ground system. It always gets power from the battery, needs ground to complete circuit.That part is not in fuse box. You need a circuit diagram showing where those circuits ground. You can make a test wire by just grounding it smewhere where you are sure it is making contact then touch the ground side of the light socket and see if it lights up. If not, you know that part of the ground is bad.

Sep 19, 2014 | Cars & Trucks

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The battery keeps draining i can charge it runs. park it at night it runs the battery down. i have tried a new battery.tried charging it and not driving the truck and at still drain the juice.


remove the pos battery terminal and connect a test light to the cable and battery, remove the fuses one at a time till the light goes out, remember the dome light is on when checking interior fuses. either remove the bulb or push the door button in, this will direct you to the circuit that has the problem

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2 Answers

Small drain on battery when off, enough to drain


most of todays cars have small draws to maintain computer memory for the ECU and the radio. 50 mA or less normally.

If you have a higher draw than this you probably have a short somewhere. You can put an ammeter inline with your cars battery and pull fuses one at a time to see if a single circuit is at fault.

If the fuse pull doesnt work you will need to check for the fault backwards from the fuse panel. A continuity test with the battery off to see if the hot side is grounded ahead of the fuse panel should do it.

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1 Answer

95 Camry interior lights don't work


The ecu-ig fuse is for the ignition from the Electronic Control Unit, or computer. The SRS fuse is for the Supplemental Restraint System, that is for the air bag system. The dome light is fused with a 7.5A fuse called "dome", which is up in the engine compartment junction block #2, on the inside of the left front wheel well. The "dome" fuse is in the lower left quadrant of the block.

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2 Answers

Battery drained every day,battery is brand new.


When it is running,put a volt meter across battery terminals. You should see 13 + volts if alternator is working. Also put an ampere meter in series with a battery cable,key off, engine off, and you should see less than 40 to 50 Mili-Amps. If more,start pulling one fuse at a time,untill you find the circuit that is draining the battery

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1 Answer

Battery drains down when it sets for 2 days ,noticed if u you remove white plug at body control modrule it stops drain on battery that plug is also on instrument cluster circuit 1998 grand cherokee also i...


Have you tried to pull one fuse at a time to see if you can find it that way. From your post I am going to assume that your are using a test light or meter between the battery term and disconected cable. If not try that as you pull the fuses and narrow down the draw. Don't forget to pull the light bulb from under the hood and make sure that the dome light and all other asscessories are turned off.

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1 Answer

Something is zapping the battery in 1990 Ford Taurus


You have an electrical drain in the vehicle somewhere. The first place I would check is the dome lights, if they are off you will need to start eliminating each individual circuit. To do this you will need to get a 12 volt test light. remove the positive battery cable and connect this test light (one end to the cable and the other to the battery the test light will light up at this point) this is completing the battery circuit, next go to the fuse panel and have someone watch the test light, the first fuse you will need to remove is the dome light fuse. If you remove this fuse and the light goes out then you have a constant drain in the dome light circuit which could be a blown bulb or bad door switch. If the light stays on then leave this fuse out (due to the doors being open)and continue 1 by 1 removing fuses until the test light goes out, keep in mind if the light doesn't go out go ahead and reinsert the fuse to eliminate any confusion on where they go. Once you find the circuit that has the problem then we can diagnose what part may have failed to find your drain but more than likely it will go out with the dome light fuse removed. The door switches on these cars had some issues.

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1 Answer

Short circuit in dome light circuit 1987 toyota celica gt


Sometimes the dome lite is turned on manually by rotating the headlamp switch knob, try turning it off with the knob. Best time to check for light left on, is in the dark.
Hopefully pulling the dome lite fuse will stop the battery drain.

Apr 07, 2017 | 1987 Toyota Celica

1 Answer

My 1992 GTS radio,flashers,trunk light,horn dont work and air bag light on


The horn and the flashers are controlled by the 15 amp HAZ-Horn fuse.
The trunk light is powered by the 20 amp Dome light.
The radio is powered by the above Dome fuse, and the 15 amp Radio & CIG fuse.
With a 12 volt testlight, check for power on BOTH sides of the above fuses. If you have no power to either side of the fuses, you have an open circuit under the hood that feeds said fuses: Look for an open circuit in the main fusible link coming right off of the battery positive terminal to the wiring harness.

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