POONER951

fuses and relays associated with the ECU AND LOCATION

POONER951

I need to know where the ecu is on 04 tl

justnspace

iTrader: (1)

underneath the navigation unit/center stack...towards the passenger side.
to gain access, go through passenger side

POONER951

Thank you my girl hooked up battery wrong and said she heard loud pop because she had ran it outta gas then once she put gas in and didnt cycle the key just cranked on it and probably did when ran out anyway she killed the battery took one out of her dads car and put it in backwards heard loud pop now wont start i checked the main fuse and wasnt poped but car wont start it just turns over and im getting spark but no fire plus it just dont sound the same even when im turning it over it sounds best way to describe is nasaly like i can hear it cranking over in the exhaust i dont no but i need help

justnspace

iTrader: (1)

i would think the main relay and fuses took the brunt of the damage.

POONER951

I dont know location of all relays ive checked all fuses and they seem to bee good i dont no why main didnt pop she said she heard loud pop when it happen also how do i test the relays

BreezyTL

iTrader: (8)

Check for continuity, even tho it may seem to be good it could really be shot.

nfnsquared

OP, exactly which fuses did you check?

01acls

The loud pop was made at the connection of the battery cables and not the fuses. Fuses only protect if the current is flowing in the right direction. You guys need to "Think outside the fuse box" (in reverse).

By hooking up the battery cable backwards your girl just turn all the control units into fuses. Depending on which circuit was activated, the corresponding control unit, solenoid, motor, etc, would most likely be fry or burnt out.

The fuses would be the last weakest point in the circuit therefore least likely to pop.

POONER951

so any suggestions where i should start??

peter6

- Fuses protect from over-current situation. It's just piece of metal that doesn't care about direction of current. (it doesn't matter which side you put them in) But it's good place to start as reversed polarity might cause over-current situation.
Relays and DC motors shouldn't be damaged by applying reverse polarity. They might work just fine while doing so (or work in reverse depending on motor type) (unless they are brush-less motors with electronic controller)

- Big question: is car behaves normally? If you turn key, dash lights up, gas gauge goes up, display works, radio and ac fans works, remote unlocks/locks door, windows work, etc ?

I've been close to car jumped the wrong way. Alternator needed to be replaced, but everything else worked fine. But then - it was old car, and it was long time ago, so I might not remember it correctly.

If the worst comes to the worst, all electronic boards might get damaged. Or at least all that are activated at this time (separated by relay will be fine).