Fog lights will not turn on?

Hello,

Please note that the headlights need to be switched on in order for the fog lights to work.

Please see image1+3 below.

There are 2 fuses for the fog light relay, circled in red.
First check that these are in order.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Next check that the fog light switch switches a ground on black/red wire when activated.
This can be done by using either a test light or a voltmeter.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester
and
https://www.2carpros.com/articles/how-to-use-a-voltmeter
and
https://www.2carpros.com/articles/how-to-check-wiring

If a ground is switched to the passenger junction box next check that the junction box outputs a ground to the fog light relay on the black/red wire.

The relay layout should be constant 12V at terminal 30, red wire.
Switched 12V at terminal 86, red/black wire from head low L fuse, 10A.
Switched ground at terminal 85, black/red wire from passenger junction box.
12V output at terminal 87 via red/green wire to front fog lights.
To test the fog light circuit you could bridge terminal 30 and 87 at the relay.
The fog lights should illuminate.

See image 2 for a basic relay layout.

Hope this helps.

Cheers, Boris