Led daytime running lights not working

[Shadeyman]

Fog lights are very useful here in England, especially the rear fogs. Thick mist and fog can sometimes be a real issue. That said there are those who have no idea how to use them and dazzle other drivers.

I do have an aftermarket set of DRL's to fit to the wife's car, I've just not fitted them yet.
Purchased the kit from China, quality seems ok. I guess I'll find out when I fit them.
https://www.aliexpress.com/item/Wate...847199238.html

If anyone is after a cheap set of "Position Lamps", China have those covered too.
https://www.aliexpress.com/item/3078...863211909.html

[Shadeyman]

So, getting back on track.
I found this wiring diagram online(https://cardiagn.com/2011-volvo-xc60...p-39181202-pdf) page 71..


As you can see from the wiring diagram, the small incandescent parking lights in the headlights are wired in parallel with the LED Position Lamps and are controlled by the Central Electronic Module(CEM).

So either there's a break in the wiring, or there's a faulty ground connection which is the most likely IMO. I'll find out later today when I remove the front bumper.

[Whyman]

Originally Posted by Shadeyman

I do have an aftermarket set of DRL's to fit to the wife's car, I've just not fitted them yet.
Purchased the kit from China, quality seems ok. I guess I'll find out when I fit them.
https://www.aliexpress.com/item/Wate...847199238.html

I fitted a set of these about 5 years ago. Very easy to fit. Still perfect.

My only concern was that the near side one has an open louvre which allows cold air to blow directly on to the screen wash bottle and might make it more likely to freeze. Not been a problem but we have not had any really cold winter days since fitted

[Shadeyman]

Originally Posted by Whyman

I fitted a set of these about 5 years ago. Very easy to fit. Still perfect.

My only concern was that the near side one has an open louvre which allows cold air to blow directly on to the screen wash bottle and might make it more likely to freeze. Not been a problem but we have not had any really cold winter days since fitted

The ones I have are completely enclosed, no vents. Just knock outs for the parking sensors ..

[Shadeyman]

After removing the bumper and disconnecting the large connector near the drivers side wheel I realised the fault lay with the large connector as the ground and wiring was 100% ok.
After pulling the connector apart and cleaning it with electrical cleaning spray I put the bumper back on and now they work perfectly.
Access to the large connector is much easier via the front drivers wheel arch. Just remove the 4 screws, pull back the inner mud guard.

[Fat Magpie]

The plot thickens - Indeed the circuit diagram shows the LED's and marker lamps connected in parallel but once a marker bulb died on my XC60 and the LED went out as well.

I was hoping they were in series as I had a mad plan.

Both LED and bulb run quite dim so its a reasonable guess both are 12v but as they are connected in series they are only getting roughly 6v each (sharing the 12v)
You can buy 3rd party control units on eBay, these can sense when the ignition is on and lights off (if wired correctly to the car) and they can send 12 volts on a separate cable. I was hoping to use the 12v supply to directly drive the LED.
Hence when the ignition is on you get a bright LED DRL but as soon as you switch the lights on they would dim.

[Shadeyman]

Originally Posted by Fat Magpie

The plot thickens - Indeed the circuit diagram shows the LED's and marker lamps connected in parallel but once a marker bulb died on my XC60 and the LED went out as well.

I was hoping they were in series as I had a mad plan.

Both LED and bulb run quite dim so its a reasonable guess both are 12v but as they are connected in series they are only getting roughly 6v each (sharing the 12v)
You can buy 3rd party control units on eBay, these can sense when the ignition is on and lights off (if wired correctly to the car) and they can send 12 volts on a separate cable. I was hoping to use the 12v supply to directly drive the LED.
Hence when the ignition is on you get a bright LED DRL but as soon as you switch the lights on they would dim.

I removed the LED's and tested them with 6v and 12v connected directly to them. They only lit up with 12v connected so they're definitely 12v modules not 6v. This means they will not be any brighter if you do connect them up to a 3rd party control unit. I doubt yours are wired in series, I suspect the CEM shuts down the supply when it detects a blown bulb(incorrect load). And because the LED is wired in parallel the LED goes out too.

[Shadeyman]

I think I'm right in saying that all the previous XC60 LED's are wired in parallel with the parking lights.
Just checked the wiring diagrams for the 2009 and 2010 XC60, both show the LEDs wired in parallel.
2009
https://cardiagn.com/2009-volvo-xc60...ng-diagram-pdf
2010
https://cardiagn.com/2010-volvo-xc60...supplement-pdf

[hancym]

Originally Posted by Shadeyman

Fog lights are very useful here in England, especially the rear fogs. Thick mist and fog can sometimes be a real issue. That said there are those who have no idea how to use them and dazzle other drivers.

I do have an aftermarket set of DRL's to fit to the wife's car, I've just not fitted them yet.
Purchased the kit from China, quality seems ok. I guess I'll find out when I fit them.
https://www.aliexpress.com/item/Wate...847199238.html

If anyone is after a cheap set of "Position Lamps", China have those covered too.
https://www.aliexpress.com/item/3078...863211909.html

Does anyone know if these will fit a 2010 XC60? Does the fitment differ for a 2011 onwards?

[Fat Magpie]

Originally Posted by Shadeyman

I removed the LED's and tested them with 6v and 12v connected directly to them. They only lit up with 12v connected so they're definitely 12v modules not 6v. This means they will not be any brighter if you do connect them up to a 3rd party control unit. I doubt yours are wired in series, I suspect the CEM shuts down the supply when it detects a blown bulb(incorrect load). And because the LED is wired in parallel the LED goes out too.

Bugger, thanks for checking, Volvo huh, the CEM disabling the circuit if the current draw drops.