Electrics not working/saving set?

[Ozzy]

Hi,

Hoping someone can point me in the right direction in chasing down this fault. Recently brought the car and several electrical gadgets are not working.


-Interior light

-Window demister

-Clock - Realllly dim, only shows 01:00 and won't save time. Tried another clock and same issue.

-Stereo not saving settings. Soon as memory wire is connected, it stops working so both power and memory have to be connected to power wire only.

-Central locking not working. There's also no door chime or symbol on speedo when it's opened.

-Rear foglights - Fronts are missing but doubt this matters. No illuminated foglight symbol on speedo when turning on or off either. Tried another headlight stalk from my Celica and not working also.

Have checked all fuses and everything seems fine?

[fawtytoo]

A poor earth connection somewhere?

[Carolyn]

Body control module?? 

[Ozzy]

Body control module?? 

Didn't realise MR2 even had one as never heard anyone mention anything about it.

Any ideas if swapping this out will effect keys/immobiliser?

[Carolyn]

Didn't realise MR2 even had one as never heard anyone mention anything about it.

Any ideas if swapping this out will effect keys/immobiliser?

I doubt it.  The security is in the ECU.

[StuC]

I know it might sound like an obvious thing. Have you had your battery checked out?

[Ozzy]

I know it might sound like an obvious thing. Have you had your battery checked out?

Battery seems fine, car cranks up straight away and runs like it should.

12.4v with engine off and 14.7 with engine started.

[Carolyn]

If you look in the fuesbox in the negine compartment there is a fuse the the body control.  Check it?

[shnazzle]

If you look in the fuesbox in the negine compartment there is a fuse the the body control.  Check it?

Everything you mention is connected to the fuse box on the left side of the dash. So that would indeed point to upstream in the engine bay from what I can tell.
But if some things are working (dimly) then one of the core earthing points to that engine compartment fuse box or the one in the instrument panel seems to be best bet.

If it was a main fuse then you'd think nothing would work at all right?

[shnazzle]

Some ground points

[Ozzy]

UPDATE, found the problem. Thanks everyone.


In the end it wad something soo stupid and simple... The engine bay ECU-B1 fuse was in the wrong slot and previous owner put it in the SMT gearbox fuse slot instead.

I checked all the fuses originally but didn't think they'd be in incorrect positions and later when checking specific fuses, I matched the amps and colours instead to locate them. Definitely learnt a lesson for next time 🫩😪

Everything working again, even though confused why my windows and cigarette lighter still worked. Thought all these were connected and worked off the 15a dome fuse

[Carolyn]

Well done for getting to the bottom of it.  That's a lesson for all of us!