HELLO SCOTTY,
I have 2009 toyota corolla LE 1.8L for one year, automatic. Sice I'm driving this car it blows fuse #15(seat heater) in the driver side fuse box, this problem block power steering, a/c, lights, radio, power windows, battery charge and more, i can drive it for a few miles while the battery has charge, even some times i change the blown fuse for a new one and it bliws again, sometimes not. I lost a lot of money paying for but the problem is still the same. PLEASE HELP ME WITH, THANKS IN ADVANCE.
well the seat heater has malfunctioned. Either the wires going to the heater under the seat are damaged, or the heater element itself is faulty. It's unlikely to be repairable, so you would have to replace it, or live without it (snip the wires and tape them up).
That's a head scratcher. Why would the seat heater fuse getting blown take out all of those other circuits?
It's a separate circuit with its own dedicated fuse. Also, I doubt you're turning on your seat heaters knowing that there's a problem and yet the seat heater fuse blows anyway.
You say when that fuse blows the other circuits affected are, power steering, a/c, lights, radio, power windows, battery charge and more.
The seat heater fuse 15 blowing couldn't affect them.
Looking at the fuse box diagram those other circuits which are acting up are protected by fuse 9 (ECU-IG2) and fuse 10 (ECU-IG1).
So something else is going on here.
What does fuse 15 have in common with fuse 9 (ECU-IG2) and fuse 10 (ECU-IG1)?
Looking at the Power Source diagram there's a couple of things they have in common.
First, the IG1 Relay provides the power to Fuse 15, as well as Fuse 9, and Fuse 10.
Second, if you refer to the Seat Heater Switch circuit I posted and the Power Source diagram above, the IG1 Relay and the Seat Heater switch share Ground Point E2. (you'll have to use a service manual to locate it)
Is there an issue with Ground Point E2? The IG1 Relay needs it for the Control Side Ground of the IG1 relay coil to energize the Relay when the key is turned to ON. (If you have Smart Key the power to the control side of the IG1 relay comes from the Body Control Module. If you don't have Smart Key it comes directly from the ignition switch) ((Either way if there's a bad Ground the relay can't be energized so no power to those other fuses)).
Is the problem in the Seat Heater switch shorting the ground to power and blowing the fuse, or is the short in the fuse box itself, or in the relay box which houses the IG1 relay, or is it just a loose Ground point at the E2 location?
Since Fuse 15 is blowing check the seat heater switch first. Maybe it's shorting out in there. Then test the IG1 relay sockets paying attention to both of the Power inputs and then see if that E2 Ground relay socket can support a load using something a little more "beefy" than a test light. Maybe make your own test light out of a brake light bulb/tailight bulb socket and run a load through that circuit at the relay socket using that E2 ground point.
Of course inspect all the sockets and connectors on the IG1 relay, the fuse box (including the back of the fuse box), and the seat heater switch for either shorting, heat damage, or corrosion. Then locate that E2 Ground point and inspect it.
....that's all I got
