3 Wire input to a 4 wire output

[Muadi]

Hi all. I have a project going, and I need some assistance. Wiring is not my strong suit.
I'm doing a major car project. Standard hotrod stuff. The circuitry for my mirror control is a 3 wire system. The mirrors I'm installing use 4 wires. I have the logic of all the wires, but I'm getting stuck on how to get the next step done. Here is what I know:
My mirror switch has 3 wires, which has the following function:
..................Yellow............Brown........Blue
Left................-....................+
Right..............+....................-
Up.......................................+...............-
Down...................................-...............+

As you can see, when moving left/right, the yellow wire becomes energized and blue is neutral. When moving up/down, yellow becomes neutral and blue becomes energized.

For my mirrors, I have 4 wires that need to see inputs.
....................Light-green.............Light-green/Blue.................Light-green/Yellow.................Black
Left.....................-...................................+....................................-...............................-
Right..................+...................................-.....................................-...............................-
Up......................-...................................+....................................+...............................-
Down.................+...................................-.....................................+...............................-

I have been able to get the Left/Right to work fine. That has been easy. The hard part is Up/Down. Somehow, I need to wire it up so that when Blue is activated, I need to send a + to Light-green/Yellow... (if Blue is +, then send +, if Blue is -, then send +)

I need some sort of logic circuit set up that will send out a + when my input wire is + or -, but no signal when the wire is neutral.

Any suggestions?

Thanks in advance.... John

 

[MikeMl]

Do you have an Ohmmeter?

If so, I need you to make a little test. Take a mirror (not on the car). Measure Resistance between the following 6 pairs of wires:

Grn to Grn/Blu
Grn to Grn/Yel
Grn to Blk

Grn/Blu to Grn/Yel
Grn/Blu to Blk

Grn/Yel to Blk

 

[Muadi]

Gn to Gn/Bu = 40 ohm
Gn to Gn/Ye = no reading (meter did not move)
Gn to Bk = no reading

Gn/Bu to Gn/Ye = no reading
Gn/Bu to Bk = no reading

Gn/Ye to Bk = 64 ohm

 

[MikeMl]

Gn to Gn/Bu = 40 ohm
...

Good, this makes it easier. I'll post a solution later today...

 

[MikeMl]

John,

Some questions about the mirror control unit.

You said three wires, but there are really five counting power and ground, right?

What color are the power and ground so I can include them in a diagram?

In the table you put + and -. I'm assuming that + means that the wire is connected to +12V when the mirror control unit is powered, and the joystick is moved off center.

I further assume that - means that wire is connected to ground (battery minus) when the joystick is moved off center.

 

[MikeMl]

Gn to Gn/Bu = 40 ohm
Gn to Gn/Ye = no reading (meter did not move)
Gn to Bk = no reading

Gn/Bu to Gn/Ye = no reading
Gn/Bu to Bk = no reading

Gn/Ye to Bk = 64 ohm

This says that there are two reversible DC motors, with no cross connections. Here is my idea of how the mirror is wired internally:

I would like you to check this by connecting the mirror wires to a 12V battery. When running either motor, leave the wires to the other motor disconnected.

If the mirror moves Left-Right and Up-Down as expected, then the wiring to the switches will much easier than implied by your initial posting.

 

[SEGUODU]

Hello Muadi, saw your challenged with your mirror project. You said your switch have 3 wire, blue, yellow & brown. from my experience, a dc motor has 2 inputs & for a mirror to move left/right & up/down, you will need 2 motors. there is no way yellow + ,blue - will move a mirror left/right then yellow - and blue+ will now move it up/down. the third wire from your switch brown must have a polarity, check it

 

[Les Jones]

Hi Muadi,
This is how I think you need to connect the mirror. First confirm they are wired as in the diagram that MikeMl posted. (Mike I think you left and right the wrong way round in your diagram.)
Light green from mirror to yellow on the switch.
Light green/blue from mirror to brown on switch.
Light green/yellow from mirror to brown on switch. (Note there are two wires connected to the brown one on the switch.)
Black from mirror to blue on the switch.
Muadi, I think your diagram of the mirror is wrong showing that all 4 wires need to be connected to get any movement.
Les.