non starting mystery... - Toyota Yaris Forums

CTScott · 08-09-2013, 06:06 PM

The cluster gets constant power from the ECU-B fuse and switched power from the MET fuse and illumination power from the PANEL1 fuse. It also gets a power feed from the HAZ fuse, as it directly drives the turn signals.

The IG2 Relay feeds the MET fuse power.

If all of those fuses are good, check the voltage on the light blue (ECU-B) and pink (MET) wires, which are right next to each other on one corner of the larger cluster connector. The ECU-B should have power all the time and MET should have it only when the ignition is on.

tooter · 08-09-2013, 07:36 PM

Quote:

Originally Posted by CTScott

The cluster gets constant power from the ECU-B fuse and switched power from the MET fuse and illumination power from the PANEL1 fuse. It also gets a power feed from the HAZ fuse, as it directly drives the turn signals.

The IG2 Relay feeds the MET fuse power.

If all of those fuses are good, check the voltage on the light blue (ECU-B) and pink (MET) wires, which are right next to each other on one corner of the larger cluster connector. The ECU-B should have power all the time and MET should have it only when the ignition is on.

Ok... with the key switch in the ON position, there is no power to:

the MET fuse
the IGN fuse
the IG2 fuse

Here is the engine compartment fuse box layout:

There is power to the ECU #1 fuse under the dash.

The under dash registry.

I used an AM radio to pick up powered and unpowered fuses as it "ticks" when they are removed and reinstalled. on the ones that didn't tick, I confirmed no power with a multimeter.

tooter · 08-09-2013, 09:02 PM

I tried a test. Removed the MET fuse, stuck a spade terminal in the socket and jumped it to the positive battery terminal. The dash gauges turned on. Put everything back together and it's still the same no go...

CTScott · 08-09-2013, 10:38 PM

Quote:

Originally Posted by tooter

I tried a test. Removed the MET fuse, stuck a spade terminal in the socket and jumped it to the positive battery terminal. The dash gauges turned on. Put everything back together and it's still the same no go...

OK.

Power flows to the MET fuse as follows:

1. 80A MAIN fuse on positive battery terminal
2. 50A R/I Fuse
3. Contact of IG2 Relay

IG2 relay coil power flows as follows:
1. 80A MAIN fuse on positive battery terminal
2. AM2 Fuse
3. Power enters ignition switch connector on white wire (AM2)
4. Pink wire on Ignition switch connector (IG2) feeds the coil

I missed the R/I fuse when I was looking before. Check him next, and if it is not him follow the two flows above.

tooter · 08-09-2013, 10:53 PM

Ok. I'll check the chains of command. Ok. Found the 50 amp R?I. A red single.It takes a real wiring catastrophe to blow a big fuse, so I sure hope it isn't blown.

edit: It's good. I'll go through the others tomorrow.

CTScott · 08-09-2013, 11:08 PM

Quote:

Originally Posted by tooter

Ok. I'll check the chains of command. Ok. Found the 50 amp R?I. A red single.It takes a real wiring catastrophe to blow a big fuse, so I sure hope it isn't blown.

It should be one of the big boys in the under-hood fuse panel. Actually it is the square red one between the 7.5A and 20A fuses on the right side of your picture above.

tooter · 08-10-2013, 11:47 AM

Yes. Checked the 50 amp last evening and it's good. I'll check the rest today.

08-09-2013, 10:53 PM	#5
tooter play every day Drives: 2012 Yaris L 2dr 5sp Join Date: Apr 2012 Location: Los Angeles Posts: 1,962	Ok. I'll check the chains of command. Ok. Found the 50 amp R?I. A red single.It takes a real wiring catastrophe to blow a big fuse, so I sure hope it isn't blown. edit: It's good. I'll go through the others tomorrow. Last edited by tooter; 08-09-2013 at 11:11 PM.

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08-09-2013, 06:06 PM	#1
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	The cluster gets constant power from the ECU-B fuse and switched power from the MET fuse and illumination power from the PANEL1 fuse. It also gets a power feed from the HAZ fuse, as it directly drives the turn signals. The IG2 Relay feeds the MET fuse power. If all of those fuses are good, check the voltage on the light blue (ECU-B) and pink (MET) wires, which are right next to each other on one corner of the larger cluster connector. The ECU-B should have power all the time and MET should have it only when the ignition is on. __________________

08-09-2013, 09:02 PM	#3
tooter play every day Drives: 2012 Yaris L 2dr 5sp Join Date: Apr 2012 Location: Los Angeles Posts: 1,962	I tried a test. Removed the MET fuse, stuck a spade terminal in the socket and jumped it to the positive battery terminal. The dash gauges turned on. Put everything back together and it's still the same no go...

08-10-2013, 11:47 AM	#7
tooter play every day Drives: 2012 Yaris L 2dr 5sp Join Date: Apr 2012 Location: Los Angeles Posts: 1,962	Yes. Checked the 50 amp last evening and it's good. I'll check the rest today.