Retro-fitting DRLs

[Peter Bryenton]

Hi

I understand that retro-fitted DRLs require a plus volts feed to a dimmer sense wire on a control box in order to comply with UK law. I can find any amount of permanently ON +12V in the headlamp wiring loom and engine bay fusebox, but I have not so far been able to trace a circuit which is only ON when the sidelights or dipped headlamps are illuminated.

Any solution(s) please for a 2003 RAV4?

[IanML]

You could take a wire from +ve of a dipped headlamp, and one from a sidelight.  Connect each to a diode, to prevent current flowing TO the lamps, and connect the other end of each diode together.  That junction will give you what you asked for.

[Peter Bryenton]

Thank you very much Ian.

 

I really like the logical thinking behind your solution. There's an electronic components shop not far from me, so I'll go there for the diodes.

 

Sincerely

 

Peter

Edited July 17, 2018 by Peter Bryenton
Typos.