DIY - Exterior lights on when doors are remotely unlocked

[CTScott]

The dome light on the Yaris comes on when the doors are unlocked, so using a relay one can drive the headlights, parking lights or fog lights from the dome light feed, so that they illuminate when remotely unlocking the car.

Note that since the dome also comes on when simply opening the door, the exterior lights connected using this DIY will come on when opening the doors as well.

Materials required:

1. Automotive type relay
2. Relay socket or 5x 1/4" female spade terminals (and wire)
3. 4x 24-18 AWG tap splices
4. 1x 1/4" ring terminal

In the picture below, the top relay is shown with a relay socket and the bottom relay is shown with 1/4" female spade terminals.

Relays.jpg


The terminals on a "standard" automotive relay are labeled as 85, 86, 87, 87A, and 30.


For 2006-2011 Yaris:





Relay pin 85: Connect to Light Blue wire on dome light connector (in the first picture)
Relay pin 86: Connect to Pink wire on dome light connector (in the first picture)

Headlights on when unlocking:
Relay pin 30: Connect to the light blue wire, next to the pink wire
Relay pin 87: Connect to the white/black wire, next to the light blue wire


Parking lights on when unlocking:
Relay pin 30: Connect to the white wire in position 13 (in the second picture)
Relay pin 87: Connect to the wire three wires over to the right from the position 13 wire. It will either be white/black or green.


Fog Lights on when unlocking:
Relay pin 30: Connect to chassis ground (easiest way is using a ring terminal installed under a bolt that goes into the metal of the dashboard support frame).
Relay pin 87: Connect to the Yellow wire on the headlight switch connector. (in the second picture)


For 2012-2013 Yaris:

This is the body ECU, under the left side of the dash. The connector on the top right is D143. The connector on the top left is 3D and the one of the bottom right is 3C. Connectors 3A and 3B are on the back side of that white plastic box.













This is the headlight switch connector (D106):






Relay pin 85: Connect to Sky Blue wire in pin 5 of connector 3A

Relay pin 86: Connect to Black wire in pin 6 of connector 3B

Headlights on when unlocking:
Relay pin 30: Connect to the wire in pin 20 of the headlight switch connector (in the picture above it is the green wire on the top right, but the color can be green black or light blue)
Relay pin 87: Connect to the white/black wire in pin 12 of the headlight switch connector (in the picture above it is to the right of the red wire)

Parking lights on when unlocking:
Relay pin 30: Connect to the sky blue wire in pin 18 of the headlight switch connector (in the picture above it is to the left of the green wire on the top right)
Relay pin 87: Connect to the white/black wire in pin 12 of the headlight switch connector (in the picture above it is to the right of the red wire)

On the 2012-2013, the fog light wiring is not accessible to allow them to be wired to be on with the ignition off.