Jump to content
SAU Community

Battery Dying Over Night - Strange Symptoms

SECURITY

By SECURITY,
in General Maintenance

 Share

Recommended Posts

SECURITY Grand Master

SECURITY

Posted
Posted

my battery keeps going flat and i dont know why. i could leave it over night and the next morning it will barely have any power to turn on. i know its not a dead battery as i had it tested. the alternator keeps the battery charged just fine.

it started happening randomly which has me very confused.

these are the current symptoms..

- the antenna motor keeps trying to pull the antenna down (there is no antenna in there - someone randomly broke it). i cut off the power feed for this and the battery still keeps going flat. the weird thing is the deck doesnt stay on - it turns off. where does the power for the antenna motor come from?

- my AFR gauge stays on after i pull the ignition out. its power feed is connected to the ECU's ignition power feed. i pulled out the power cord for the gauge and it still goes flat.

when i pull the main relay/fuse thing out from next to the battery in the boot, everything turns off and i'd assume the battery wont go flat - i'll report back on this though.

does anyone have any idea on how i can track the issue down? i dont have a multi meter to test anything at the moment though.

any help would be great.

Got a Pulsar Grand Master

Got a Pulsar

Posted
Posted (edited)

Does your boot light go out when you close the boot?

Put your best mate in there to check or pull the bulb out. Maybe???

any help would be great.

Edited by Not a Pulsar
AngryRB Grand Master

AngryRB

Posted
Posted

Im having the same problem at the moment..... actually had this on the skyline and the falcon...

In the case of the falcon i sure it must of been the old speakers in the back that were shot, or the interior bulbs somhow contacting the body, in that case i managed to fix it..

for the skyline i have no idea, so im taking the battery off to get tested.

bloody frustrating :spank:

SECURITY Grand Master

SECURITY

Posted
  • Author
Posted

i just tried updating the firmware on the ECU and it requires me cycle the ignition on and off. when i switched the key off the ECU didnt switch off. i had to pull out the main fuse as i mention before for it to 'cycle'. i just tried turning the ignition off while the ECU was connected to the laptop and it didnt turn off!

so now i know the ECU doesnt turn off. strange! what feeds power to the ecu? is there a relay i can check in line?

t_revz Grand Master

t_revz

Posted
Posted

when i pulled out the harness in my 33 there was 2 relays under glovebox jammed in the corner. i would imagine one is for the ecm and other maybe air con. if you have them too try disconnect or swap them

blk94r33 Mentor

blk94r33

Posted
Posted

i just tried updating the firmware on the ECU and it requires me cycle the ignition on and off. when i switched the key off the ECU didnt switch off. i had to pull out the main fuse as i mention before for it to 'cycle'. i just tried turning the ignition off while the ECU was connected to the laptop and it didnt turn off!

so now i know the ECU doesnt turn off. strange! what feeds power to the ecu? is there a relay i can check in line?

You haven't modded the over-heat fan to run with the air-con? This was causing the same problem with mine...

Munkyb0y Grand Master

Munkyb0y

Posted
Posted

afaik the aerial up/down is enabled by the ecu too. so it's all related to your ecu i'd imagine.

You haven't modded the over-heat fan to run with the air-con? This was causing the same problem with mine...

this happened to me too.

SECURITY Grand Master

SECURITY

Posted
  • Author
Posted (edited)

i havent modded the air con system in any way so i doubt thats the issue. ill check out the relays behind the glove box and see what happens.

i pulled out the main fuse in the boot and it doesnt lose charge. i might just hook it up to a kill switch if i cant find the problem soon.

keep the suggestions coming guys, im willing to try everything.

Edited by SECURITY
t_revz Grand Master

t_revz

Posted
Posted

i havent modded the air con system in any way so i doubt thats the issue. ill check out the relays behind the glove box and see what happens.

i pulled out the main fuse in the boot and it doesnt lose charge. i might just hook it up to a kill switch if i cant find the problem soon.

keep the suggestions coming guys, im willing to try everything.

those relays i mentioned earlier are behind the ecm facing outwards...but i still dont know if they are for the ecm but would be most likely and worth a try

75coupe Grand Master

75coupe

Posted
Posted

does the car have an alarm system in it?

alarms have rechargeable batteries and if that battery has decided to die (which happens quite a bit) the alarm will run off the cars battery instead...

SECURITY Grand Master

SECURITY

Posted
  • Author
Posted

it does have an alarm but that doesnt explain why everything stays on. if the alarm was draining the battery then the other things shouldnt be happening regardless.

pulling out the main fuse didnt really do anything, it still went flat. i tried the relays behind the ECU, i swapped them around and nothing happened. im starting to think its the actual ECU.

SECURITY Grand Master

SECURITY

Posted
  • Author
Posted

So I may have a little progress. I unplugged the ECCS relay and connected it to another known working one with no success. Although everything turns off when I pull the ECCS relay off.

I then started the car without the ECCS relay connected and it started but stalled around 5-7 seconds after running and everything else switches off when I take the key out. Every time I pull the key out and try start it again it starts and stalls. Does this mean anything to anyone?

  • 2 weeks later...
SECURITY Grand Master

SECURITY

Posted
  • Author
Posted

figured it out.

the ECU wasn't sending 12v to the ECCS relay (pin 16) when the ignition is turned off which keeps a lot of accessories on. it was continually grounded. sent the ECU off to get repaired and now its working great.

SargeRX8 Grand Master

SargeRX8

Posted
Posted

My car was at the tuner the other day for about a week. The battery died. When they went to jump it they said there was a pretty big spark which indicated that something was drawing alot of current with the car off... Everything is completely off the only thing which looks to be on is the alarm. I'm going to disconnect the sound system when this weather f**ks off.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • RP1421
      S15 Spec R

      By RP1421 · Posted

      A few small updates since the previous post and lessons. I decided to do a little interior light upgrade on the 110. I quite like the iilumo items, even if they're a bit of a premium over other brands. You'll also note the Stedi Fogs, that will go into the S15 fog lights as I needed to match the bulbs since I got the new ones earlier. I hope they fit as the body is quite a bit longer than your normal bulb.  Annoyingly, I managed to trip the fuse, which normally wouldn't be an issue until I located the fuse. I can't say I've ever come across this. I had lucked out that someone nearby had a spare, but oddly enough Toyota dealerships seem to keep this in stock. I ordered some to keep in my stash and as luck would have it, someone else nearby tripped the same fuse so I passed on the favour.  I also did a little service on the 110 ahead of some additional work coming up. It's been annoying that Goleby's stopped carrying this particular HKS filter for the 110, so now I need to keep them on order from Japan. I also took the opportunity to install a bash plate and number plate riser. The plate riser is such a cheap but nice fix to help really tidy up the car. I'm tempted to now also replace my headlights, on this car. Both items were from Project Aero.    I also needed to replace the rear tyres on the 110, and after trying to get it aligned learnt that I need to replace some bushes in the front end, so that's next.  Closing out this update with a nicer picture as always! 
    • Murray_Calavera
      WTAC 2025

      By Murray_Calavera · Posted

      Yeah mate, never miss it.
    • Ozdavroz
      WTAC 2025

      By Ozdavroz · Posted

      Any going to watch World Time Attack at SMSP this year?
    • Jarsky
      R33 Fuel Pump & Brakes after alarm swap

      By Jarsky · Posted

      Appreciate the correction on the "ground", that will make a huge difference to looking at this. That makes complete sense about AF70/AF71 which is what I had come down to being the issue, one of these. I'll have another look in the ignition wiring when I get a chance next week. I'll also make up a jumper wire for running that AF73 test.  ECU is fine, relay itself is fine, pump harness is fine and the pump itself is fine. I am going to upgrade the Walbro 255 anyway with a DW300 I have since I need to replace the fuel sender and I'm going to upgrade the FPR with my chasebays kit ready for new plenum/injectors/dbw, but I'll get this working first. That's why this is so frustrating. 
    • zillah
      Recommendation for engine oil funnel spill free

      By zillah · Posted

      hahaha good on
×
×
  • Create New...