As a bored stiff Corona project I wired the fog lights in a 2009 Fabia II up to be used as DRLs.

 

I got a 12V from the blue wire at BCM, XS4, pin T18a/9 (connection 61 in main wiring harness) which runs 12V only when the engine is running.

I then connected it to the standard DRL switch in the fuse board.

I used a relais to switch the DRL pin from the light switch - T17a/3 - to go onto the fog lights. In order to stop the dashboard front fog warning light to come on with the fog lights as DRLs I soldered a 30SQ045 - 30A 45V - Schottky diode in. This allows a forward current from the light switch to the fog lights and dash warning light but stops the DRL current to go back to the dash warning light.

 

The parts needed are:

DRL switch - 5J0 941 503

a relais

a Shottky diode 30SQ045

a few spade connectors

heat shrink tubing and some wire.

 

Below is a DIY current flow diagram.

Now while some cars that use fog lights as DRLs have an E-number stamped on the fog lights, I am using bog standard Fabia II fog lights. In the eyes of a very picky MOT tester this could be a fail, but you can always switch the DRL-fog lights off altogether.

 

 

 

 

 

 

You do also need the DRL's to "dim" when the lights are switched on as well especially when using fogs as they will be to bright as DRL's

Edited 11 August, 20205 yr by UrbanPanzer

The FII light switch automatically cuts the TFL pin. So DRLs are off when either side lights or main beam is on.

On 11/08/2020 at 22:44, 26DIPP said:

As a bored stiff Corona project I wired the fog lights in a 2009 Fabia II up to be used as DRLs.

 

I got a 12V from the blue wire at BCM, XS4, pin T18a/9 (connection 61 in main wiring harness) which runs 12V only when the engine is running.

I then connected it to the standard DRL switch in the fuse board.

I used a relais to switch the DRL pin from the light switch - T17a/3 - to go onto the fog lights. In order to stop the dashboard front fog warning light to come on with the fog lights as DRLs I soldered a 30SQ045 - 30A 45V - Schottky diode in. This allows a forward current from the light switch to the fog lights and dash warning light but stops the DRL current to go back to the dash warning light.

 

The parts needed are:

DRL switch - 5J0 941 503

a relais

a Shottky diode 30SQ045

a few spade connectors

heat shrink tubing and some wire.

 

Below is a DIY current flow diagram.

Now while some cars that use fog lights as DRLs have an E-number stamped on the fog lights, I am using bog standard Fabia II fog lights. In the eyes of a very picky MOT tester this could be a fail, but you can always switch the DRL-fog lights off altogether.

 

 

 

 

 

 

idont suppose u cannmake a loom so can fit same to my car?

I can post pictures of the "loom" if you are interested.

Yes please mate I would also be interested in seeing the loom you made up thanks.

 

9 hours ago, 26DIPP said:

I can post pictures of the "loom" if you are interested.

thatd be great give me idea to look for cheers

Here are some more pictures

 

The "loom" I made starts from both the fog light wire behind the fuse box and the blue wire - connection 61 from BCM, XS4, Pin T18a/9. I cut the fog light output behind fuse 38 - 2.5mm yellow / white - and soldered a loop in long enough to get it to the side of the dashbard. On the picture above I marked the "leg back to the fuse and the one out to fog light. Explained later.

I then soldered a 0.5mm wire onto the  T18a/9 wire. The T18a/9 wire runs to the DRL switch next to the fuse box. This is wired as a simple on/off switch. It then runs out to the side of the dashboard. This blue wire is only live when the engine is running and switches the "DRLs" via a relay.

 

 

The relay below I used to only switch the "DRLs" on when the engine is running as the DRLs are not low powered bulbs and I thought I could drain the battery if I was sitting with ignition on and engine off, i.e. small current - from BCM - switches big current - fog light output.

You run a wire from the light switch pin 3 - marked TFL - to the relais, solder one wire onto the ground wire (sorry I marked it earth) on the light switch - brown - and connect the blue wire from the DRL switch and the output to the fog light.

I soldered a fuse holder onto the BCM output as a precaution.

 

Next I cut the loop to the fog light and soldered my new output from the relais / TFL pin3 output onto the leg going to the fog light (marked DRL/foglight) on the first picture and then I soldered a Schotky Diode 30SQ045 onto the leg going back to the fuse box with a little extra wire and the closed the loop again. The Schotky Diode allos current flow in one direction only and stops the dashboard foglight lamp going on when only the DRLs are on. If you switch the fog lights on the dashboard lamp will come on.

I went for a 30SQ045 as it can carry a current of 30A for the fog lights and will stop up to 45V going back.

 

Edited 26 January, 20215 yr by 26DIPP

yr a star any pic yr lamps or are same as mine

Your fog lights are from the facelift model. I do not know what you have in the lights - fog light, cornering light, DRL. The FL still uses the switch near the fusebox and the BCM is similar.

il try it buddy and see