2007 Toyota Camry parasititic battery drain

Tiny
MILFORDMAN
  • MEMBER
  • 2007 TOYOTA CAMRY
  • 3.5L
  • V6
  • FWD
  • AUTOMATIC
  • 144,000 MILES
I have a problem with a car battery that was replaced in May 2014. The car won't start if it sits idle for more then 24hrs. I hooked it to a meter and I see a drain of 323mA on the battery. On some car siites they indicate that a parastitic drain shouldn't exceed 25-70mA. Although 323MA is significantly higher, it doesn't seem like its high enough to results in the car not starting after one day (thats after I fully charge the battery). As for the alternator, it reads 13.83v. If I turn on the lights, fan, radio, and rev the enging - its stays above 13.75-13.8v.

Any thoughts on whether this I sounds more like a battery issue or not?

Battery: AAA 24F-C
CCA: 650
RC: 115

Parasitic Drain:
Total: 323ma
ECU-B no.1 180 mA
DOME 107 mA
MPX-B 25 mA
EFI NO.1 15 mA

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Monday, March 2nd, 2015 AT 2:05 PM

3 Replies

Tiny
CARADIODOC
  • EXPERT
323 ma. Is way too much. That's a third of an amp. A typical glove box lamp draws about half an amp. Unless specified differently by the manufacturer, 35 ma. Is the maximum allowed to keep all the computer memories alive. Chrysler says at that rate, a good, fully-charged battery will be strong enough to start an engine after sitting for three weeks. Cadillac is the only manufacturer I'm aware of that allows more. That is 50 ma.

The first thing to consider is if someone installed an aftermarket radio and wired it incorrectly. If the radio doesn't turn off with the ignition switch, or if it keeps a remote amp turned on, the battery will be dead overnight.

The next thing is most vehicles now have one or more computers that need up to 20 minutes to go to "sleep" mode. Until they do that, they can draw up to three amps. That makes measuring current drain a challenge because it will blow the meter's internal 2 amp fuse or you have to switch to the 10 amp scale. That can mean moving the positive meter lead to a different jack. That, and simply switching to lower scales for more accuracy creates a momentary open circuit, and that is enough to wake up those computers. Then you have to start all over with the waiting for them to go to sleep mode.

The solution for this is to use a jumper wire to short out, (bypass) the amp meter while you switch meter ranges. Once you're on the range you want, you can remove the jumper so the current has to go through the meter.

On a truck as new as yours, the computers are going to be turned on by a digital signal from one master computer when the ignition switch is turned on. It is not likely one computer will fail to turn off, although an internal driver circuit could be shorted keeping its circuit turned on. Most of the time that will be detected by the affected computer when it's in operation and it sees something is not responding properly. It's much more common to find a light bulb staying on or something like that. One other thing that can do this is the generator's voltage regulator. Most of them now get a turn-on signal when the ignition switch is turned on, but they also have a circuit that is tied directly to 12 volts all the time. You can identify if that is the cause of the drain by unplugging it while monitoring the current drain. Next would be to start unplugging fuses to see which circuit is affected. I don't like recommending that anymore because so many manufactures have designed in tricks that cause computers to lock up requiring a trip to the dealer.
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Monday, March 2nd, 2015 AT 3:11 PM
Tiny
FARAZAFZAL
  • MEMBER
Hi. I have the same exact problem and the current drains as you suggested. Did you find the solution to your problem. All the mentioned values are 100 % similar to mine. 2008 Camry

Total: 323ma
ECU-B no.1 180 mA
DOME 107 mA
MPX-B 25 mA
EFI NO.1 15 mA
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Sunday, July 5th, 2015 AT 8:59 AM
Tiny
CARADIODOC
  • EXPERT
Hi Farazafzal. Sorry that I didn't see your post sooner. You should start a new question with the same information. That will give all the other experts a chance to see it and respond. They don't get to see any comments posted on this thread.
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Monday, August 24th, 2015 AT 9:47 PM

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