Luggage light

[geoded]

Luggage compartment light no longer Works, fuses are not burnt, bulb is not burned, but, still does not work, has anyone any idea?

[jcboy]

the switch on the trunk latch doesnt make contact to the metal/body.

if you look closely there's something there that gets grounded to trigger the light.

[nortonfb]

Have checked the bulb with a meter?
Have you checked for output from the bulb back?
Norton

[CTScott]

The grey wire should have constant +12 Volts on it and the orange wire gets grounded when the hatch is opened.

Does the door open light come on on the cluster when you open it?



Correction - The above is for a 2nd gen Yaris.

For your 2012:

The Blue wire gets power directly from the body ECU and the black wire gets switched to ground either by the hatch switch.

[geoded]

Originally Posted by CTScott

The grey wire should have constant +12 Volts on it and the orange wire gets grounded when the hatch is opened.

Does the door open light come on on the cluster when you open it?



Correction - The above is for a 2nd gen Yaris.

For your 2012:

The Blue wire gets power directly from the body ECU and the black wire gets switched to ground either by the hatch switch.

Is correct, I have 2 colors, black and blue. Black is ground, and the blue have zero volts. ECU problem?

[CTScott]

Originally Posted by geoded

Is correct, I have 2 colors, black and blue. Black is ground, and the blue have zero volts. ECU problem?

Jump the black to a chassis ground point and see if it comes on. The body ECU monitors the black wire and may want to see it grounded (by the switch) before it supplies power to the blue wire.

[geoded]

I will try to look carefully to find a switch. Thank you. Returning to the research result :)

[geoded]

I opened, I measured ( zero volts), but, I have not found anything other than, the black wire is grounded indeed. Perhaps, the blue wire before reaching the ECU goes through a switch or a fuse that, I do not find it. No hope :)

[CTScott]

No. It's a direct run to the body ECU. When you say you are sure the black wire is grounded are you going by measuring zero volts or did you actually measure resistance to ground where you saw zero ohms?

[geoded]

I'm sure the black wire is grounded, I put the meter on it. tension between the black wire and the blue wire is zero volts.

[geoded]

The black wire is ok, he is grounded when I open the luggage compartment, and he is not grounded when when I close the luggage compartment, So, my problem is blue wire , he dont have 12 volts. The voltage is disabled in ECU? please, can someone help me?

[CTScott]

Originally Posted by geoded

The black wire is ok, he is grounded when I open the luggage compartment, and he is not grounded when when I close the luggage compartment, So, my problem is blue wire , he dont have 12 volts. The voltage is disabled in ECU? please, can someone help me?

The only way to further diagnose it would be with the Toyota techstream tool. I suspect though that the MOSFET that drives that wire, within the body ECU, is bad.

[geoded]

I have Toyota techstream tool, not found error, Looking for something specific?

[geoded]

Toyota Techstream

[CTScott]

For the Body ECU, go into the "Data List" and see if it sees the hatch as being open. For that same ECU, go to active test and see if you can turn on the hatch light.

[geoded]

I dont found hatch, but i found else :-) front fog relee, but i dont can activated.

[geoded]

I dont found hatch, but i found else :-)

[geoded]

and, front fog relee