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You can use a small aa battery to identify the speaker wires and to which speaker they go. By putting 1 wire on the positive and 1 wire on the negitive of the battery the speaker will make a small scratching sound. You will still have to figure out the speaker wires first. Use this method and go thru a process of elimination. There could also be a factory amplifier under the passenger seat which could cause you trouble. Failing that, running new speaker wiring from the head unit will sort all problems.
I hope that helps.
The relay for the cooling fan may be sticking on. Relays are inexpensive (about$15), or just get one from a salvage yard. If not the relay, the coolant temperature sensor could be it, or check if there is a fan temperature switch (maybe called a thermal switch) in the radiator that is tied into the fan circuit. Sorry, I don't have access to a wiring diagram for your Toyota. If none of the above helps, suspect an ecu malfunction-the engine computer.
I think you missed checking a couple of things more.
1.- Water Pump
2.- Temp. Sensor
3.- Radiator Fan
5.- Spark Plugs
6.- Spark Plug Wires
7.- Vacumm Leaks
8.- Fuel system (Pump pressure, injectors, leaks)
9.- Electrical System
10.- Check for even compression on all cilinders.
Try the following free download, good luck!:)
Brakes, Wheels & Tyres
Central Locking Stuff & Alarms
Electrical System & I.C.E
Fuel & Emissions System
Suspension & Steering
there are actually 3 temp sensors. 1 is on the top of the engine that goes to temp gauge in dash has 1 wire. next to it is a 3 wire sensor for engine control and choke. on the bottom of the radiator next to the hose is a 2 wire sensor. loosen all 3 but leave connected. get engine hot past halfway point on dash gauge. with ac off disconnect 1 sensor at time. start with 2 wire under radiator. it takes the most abuse. fan will come on when you disconnect broken sensor. 2sensor must agree for fan to stay on till engine cools when turned off. note this is solution i used after verifying fuses, fuseable links and relays worked.WOO HOO! make sure you check both the fuse box under hood and fuse boxleft side of steering wheel my ECU fuse was inside my bros was outside.ECU B on my car goes to nothing and is under hood. Had it confused with ECU on wiring diagram.DOH!