As I promised, this past Friday I installed the DRL mod in two smart Cabrio's which have the auto headlight's installed. I installed the unit sold by AEA. It work's great...now I never have to use the headlight switch.
Here"s the link:
Automotive Electronic Accessories - Quality Accessories for Your Car
The unit is from " The Lite-Minder Company ".
Lite-Minder Web Page, sold by AEA
The installation is technically very easy, but physically a bit challenging working in the small space under the dash on the drivers side.
The unit has four wire's:
Green - provides the +12v to power the headlights (for DRL's)
brown - goes to ground
Red - Constant 12V
Blue - Switched 12V (it's this wire that turns on the DRL's).
Some notes particular to the fortwo...
The headlights are powered buy seperate circuits, so you need to connect the green wire to both low beam headlight circuits.
Since the fortwo has no accessory position for the key I installed an on/off switch ( a few dollars from the local auto parts store) in line with the blue wire. That way if I am tinkering with the car, washing it, etc, and want to have the radio on, I can turn the DRL switch I installed off and the headlights will not be on while running the radio without the car started.
As recommended by the instructions, I connected the blue wire to the switched 12V that powers the radio since it cuts off the radio (and now the DRL's) while actually cranking the engine.
I just leave the headlight switch in auto and during normal daylight just the low beam headlights are on (reduced intensity, see next paragraph). When dusk arrives the headlights change to full bright and the rest of the lights (tail,parking, instrument, etc.) come on.
I forgot to mention the kit also provides a power reducer (essentially a big power resistor) that limits the power/intensity of the headlights in DRL mode. I installed this feature. You simply put the resistor in series with the red wire (constant 12V).
The resistor has it's own heatsink, and the instructions say to mount flat to a metal surface (for heat transfer). I mounted it to the frame under the dash on the drivers side (right next to the fuse box). It does get hot, so I highly recommend you do not just let it dangle.
I hope this isn't confusing, but rest assured the directions provided with the unit are good.
BEST of ALL I get the USAA discount for having DRL's...yea...
- David -