[raidaru]

All right, trying to figure out how tail lights work on camaro atm, the socket has 6 wires, 2 of them are ground, the other three : one is from drl, one from reverse and one for brake/turn signal. There is another one colour white/purple which I find no meaning to it, it has @11.7V on it all the time . This is on led tail lights. I also have @ a classic tail light, that one has only 5 wires socket but even there I see sth fishy, the brake/turn signal 7440 socket has 3 wires going in it, when the bulb actually needs only 2. Could anyone explain any of this?

[Peelam]

Don't know for sure but my guess would be a signal wire to the ECU telling it if the lights are working or not.

[shaffe]

its for the optional rear facing machine guns haha

[Jeb114]

I believe its the control wire for the ECU. Monitors the condition of the Lighting system. The computer needs to know the status of the lights during operation.

[Gunkk]

And why badly made aftermarket lights can and will and do drain your battery.

[ctrlz]

Here are the pertinent schematics from the repair manual. If anyone can shed some light on the meaning of the symbols such as square, diamond, and circle with X, I would appreciate it!

[cellsafemode]

The circle X's are incandescent light symbols.

The diamond I think marks a managed voltage source. Like a dc-dc regulator

[DC5]

Originally Posted by BuckeyeROC

To conduct electricity.

Well, nobody can argue that on a very basic level you failed to answer the OP's question.

[raidaru]

Originally Posted by Gunkk

And why badly made aftermarket lights can and will and do drain your battery.

It has nothing to do with the lights, the wire comes from ecu and has voltage on it without beeing connected to the tail light.

Originally Posted by ctrlz

Here are the pertinent schematics from the repair manual. If anyone can shed some light on the meaning of the symbols such as square, diamond, and circle with X, I would appreciate it!

I still don't get where's that wire I'm talking about or what exactly it does. I'm trying to figure out a way to split the brake from turn signal without bringing wires from the engine bay, but probably that wire won't help much anyway....

[Oramac2016]

Inside the tail light housing there is another connector that connects to a circuit board that holds the leds. This might not shed light on your mystery wire but may give you something else to look at. Only thing is, to get to it the tail light housing has to be cut open. My project I have going myself is to kill the turn signal without any drawbacks (hyperflash, warning lights, etc.)

[ctrlz]

Originally Posted by raidaru

I still don't get where's that wire I'm talking about or what exactly it does.

That wire is shown at the left of the first diagram as white with violet stripe. It appears to power the left stop/turn signal LED and the left stop lamp LED. I don't fully understand all the symbols on those schematics, but along the top the symbols do look like they might indicate steering column switch and foot pedal switch (based on my imagination).

EDIT: The symbol in the upper left which I thought might mean steering column is in fact a pull up resistor. The two symbols to the right are "high side drive switches" with the hand in the stop sign meaning "brake apply."

[raidaru]

Originally Posted by ctrlz

Here are the pertinent schematics from the repair manual. If anyone can shed some light on the meaning of the symbols such as square, diamond, and circle with X, I would appreciate it!

Does anyone know exactly where is situated this body control module?

[2SSRS@Gen5diy]

Originally Posted by raidaru

Does anyone know exactly where is situated this body control module?

Look up under the dash where your stirring wheel is.

[2SSRS@Gen5diy]

Originally Posted by raidaru

All right, trying to figure out how tail lights work on camaro atm, the socket has 6 wires, 2 of them are ground, the other three : one is from drl, one from reverse and one for brake/turn signal. There is another one colour white/purple which I find no meaning to it, it has @11.7V on it all the time . This is on led tail lights. I also have @ a classic tail light, that one has only 5 wires socket but even there I see sth fishy, the brake/turn signal 7440 socket has 3 wires going in it, when the bulb actually needs only 2. Could anyone explain any of this?

OP is your car a USA car or a euro car? if its a euro car need to know if its a LED tail lights or not? from there we can try to help, and on that socket with 3 wires but only needing 2 wire GM does that and runs the 3rd wire to the next socket, they do that to save weight, its called daisy chaining the wires.