Headlight sensor install

[CTScott]

Originally Posted by biotope

The chinese text mentioned means:

1. Green is to connect to left and right headlights (never mention whether is low or high beam)

2. Blue is to connect to the license plate light, left and right side light (not sure which lights they referring to) and display light. Question - is there any wire to tap for these lights signal?

Since it is for automatic on of the lights, I would say that green then goes to low beams.

For the blue, that would go to the green wire on the bottom right of your picture. Those lights are switched on the positive side, rather than negative like the headlights.

So, you will have to add a relay where the blue wire switches the ground side of the coil (and the positive side of the coil is connected to your ACC power wire). Then the normally open contacts will connect to the green wire on the headlight switch connector and to the green/white wire, which is the second to last wire on the opposite side of the bottom of the connector.

[biotope]

Originally Posted by CTScott

Since it is for automatic on of the lights, I would say that green then goes to low beams.

For the blue, that would go to the green wire on the bottom right of your picture. Those lights are switched on the positive side, rather than negative like the headlights.

So, you will have to add a relay where the blue wire switches the ground side of the coil (and the positive side of the coil is connected to your ACC power wire). Then the normally open contacts will connect to the green wire on the headlight switch connector and to the green/white wire, which is the second to last wire on the opposite side of the bottom of the connector.

What is the function of green/white wire? Do you have the entire headlight switch connector layout?

[CTScott]

Originally Posted by biotope

What is the function of green/white wire? Do you have the entire headlight switch connector layout?

The green/white feeds the tail lights, license plate light, and front corner lights that come on when you turn the headlight switch to the first click (often called parking lights here in the US).

Attached are the illumination and headlight EWDs.

Vios - Headlight.pdf

Vios - Illumination.pdf

[biotope]

Originally Posted by CTScott

The green/white feeds the tail lights, license plate light, and front corner lights that come on when you turn the headlight switch to the first click (often called parking lights here in the US).

Attached are the illumination and headlight EWDs.

Attachment 47507

Attachment 47508

Thanks, have a better visualization on how the switching system works.

Tried to draw up something for the relay connection, is my understanding correct?

[CTScott]

Originally Posted by biotope

Thanks, have a better visualization on how the switching system works.

Tried to draw up something for the relay connection, is my understanding correct?

Correct

[biotope]

Originally Posted by CTScott

Correct

Finally managed to spare time trying out the installation. Some issue encountered, not sure if you could advice?

Without the relay connection for the parking lights, everything works well. It could auto on the headlight in the dark and off the headlight in the bright.

But when I made the relay connection, it will auto on the headlight & parking lights in the dark but fails to off the headlight & parking in the bright. I could hear the relay switching sound but the headlight & parking lights remain on.

Tried to change another relay, still having the same issue. Any idea what goes wrong?

[biotope]

Originally Posted by biotope

Finally managed to spare time trying out the installation. Some issue encountered, not sure if you could advice?

Without the relay connection for the parking lights, everything works well. It could auto on the headlight in the dark and off the headlight in the bright.

But when I made the relay connection, it will auto on the headlight & parking lights in the dark but fails to off the headlight & parking in the bright. I could hear the relay switching sound but the headlight & parking lights remain on.

Tried to change another relay, still having the same issue. Any idea what goes wrong?

Still cannot figure out why the parking lights cannot turn on by the autolight sensor. Maybe the output from autolight sensor for the parking lights portion is faulty.

Thinking of making some changes to the circuit by using the autolight sensor for the headlight portion. Below is the layout, not sure if this connection feasible? Any views?