Battery Drain

Started by Anonymous, September 5, 2009, 15:45

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Anonymous

September 5, 2009, 15:45 Last Edit: January 1, 1970, 01:00 by Guest
03 MR2 SMT
Battery drain of 0.25 amps. After checking various circuits found that removing fuse ECU-B1 (25amp) solved the problem. Circuit appears to control radio and interior light. Removed  festoon bulb but problem still there. Any thouhgts?

Wabbitkilla

#1
September 5, 2009, 16:00 Last Edit: January 1, 1970, 01:00 by Guest
Not sure where the alarm gets its feed from the run and keep it's internal battery charged.
Do you have a standard head unit ... could be worth unplugging it to see what happens.
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Anonymous

#2
September 5, 2009, 17:59 Last Edit: January 1, 1970, 01:00 by Guest
Radio needs constant live feed for memory does'nt it?Is your battery ok?

Dan_R

#3
September 17, 2009, 03:21 Last Edit: January 1, 1970, 01:00 by Guest
From experience as life of bryan says the radio needs a constant live feed to keep the radio presets, time and what not stored. I found that out after replacing the radio with an aftermarket one and not having the power constantly resulting in me having to retune the radio every time I started the car up.

Tem

#4
September 17, 2009, 09:59 Last Edit: January 1, 1970, 01:00 by Guest
Radios do take some power, but nowhere near 250mA.

Could be the alarm...? Some are quite power hungry.
Sure you can live without 500hp, but it\'s languishing.

Anonymous

#5
September 17, 2009, 13:01 Last Edit: January 1, 1970, 01:00 by Guest
Quote from: "Dan_R"From experience as life of bryan says the radio needs a constant live feed to keep the radio presets, time and what not stored. I found that out after replacing the radio with an aftermarket one and not having the power constantly resulting in me having to retune the radio every time I started the car up.

radios have to have a constant live power. they also take power from the ignition to turn them on when you turn the key

cclarke99

#6
September 17, 2009, 13:33 Last Edit: January 1, 1970, 01:00 by Guest
0.25A is very high. At this rate the battery would be too flat to start the car after less than 2 weeks. How did you measure the current, if you were using a clamp meter was it zeroed before you took the measurement?

wbarrwebster

#7
September 17, 2009, 14:04 Last Edit: January 1, 1970, 01:00 by Guest
Hi,

In my opinion, there is no way the standard radio or for  that matter any radio, should be pulling that amount of juice. In my experience a normal battery being run in a car on a daily run basis should be able to cope with the small amount of drain overnight.  IMHO it's either the battery not holding the charge or something else.

B
W. B. Webster

Anonymous

#8
September 17, 2009, 20:24 Last Edit: January 1, 1970, 01:00 by Guest
If it's an SMT, I thought the pump for the gearbox always checks for the door being opened and fires itself up. If it's always checking (I presume on that fuse line you mentioned) that'll be the drain. My cars an smt and drains after a couple of weeks also.

cclarke99

#9
September 18, 2009, 11:26 Last Edit: January 1, 1970, 01:00 by Guest
I don't have the diagrams, but I'd be surprised if the SMT didn't have it's own fuse. It's an interesting point about it checking the door, so the ECU is still powered even when the ignition is off. However, I'd hope it had a low power mode for this operation, using a lot less than 0.25A
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