VY 25th Anniversary - LED Tail lights and cruise control not working

[-jono-]

Hi all, first post on the forums, but have been lurking since I purchased my commodore back in September.

Yesterday I fitted some smoked LED altezza tail lights.

They work fine and look great, no errors on the dash and indicators, driving lights, brake lights and reverse lights all work fine and as expected.

Only problem I am having is that on the way to work this morning I went to use the cruise control and it doesn't work at all. I spoke to the local mechanic and he seems to think the LED lights will be causing a voltage change that the cruise uses.

Has anyone had this problem or a similar one before? Is there some resistor or something I need to put into the taillight assembly to balance the voltage?


Cheers,

Jono

[Jonno]

..u checked the fuse right?

[D3CID3R]

Because the LED draw less current it isnt recognised by the cruise control as braking.. so when you hit the brake the cruise control gets confused..

[-jono-]

Fuse has been checked, and just to be sure it is the lights, I swapped the old ones back in with normal globes rather than the LED board and wholla it just started working again.

So I think it is something to do with the brake sensor/cruise but no idea where to go from here.

[-jono-]

Been doing some digging online, and found this:

LED Taillights cause cruise control to not work - Honda Element Owners Club Forum

Yeah, it isn't referring to a commodore but sounds like the exact same issue.

[Jezza]

when i fitted led brake/parker globes to my vy i had the same problem and was told that because the leds use less power it sends a different signal to the computer (basicly everything electrical goes through the computer) and that messes stuff (like cruise control and traction control in my case) so i just use normal globes now

if you want to get it working then try and add a normal brake/parker globe into the circut and that might work

[-jono-]

Yeah I'm probably going to put a resistor in their with the same resistance.

I'm waiting on a third eye level brake kit to go in the back window as I took my spoiler off. So I'll probably just wire it in when I do that. For now I'll go without cruise.

[grim596]

Because the LED draw less current it isnt recognised by the cruise control as braking.. so when you hit the brake the cruise control gets confused..

It's not because it draws less current or has less resistance on the circuit,
The reason your cruise control turns off is because turning your tail lights on uses the same LED diodes as if you were pressing the brake.
Just delivers less power to them, but it sends that same feedback on the brake pedal line that the cruise control system is looking for to turn itself off.

The only way to fix it is to put a relay before both tail lights and find another +12v source.
Too much effort as far as im concerned.