Hey guys, stupid question haha. I'm trying to wire in some led strip lighting and I was wanting to utilize the factory dimmer switch for them but Im having a brain fart and can't get my head around the wiring, there's a ground, a dark green and a brown. I'm assuming the dark green is to the load, and the diagram says the brown goes to hvac which doesn't make sense to me. Any help would be appreciated, thanks.

 

I don't know what model car you have, but on an L series the dash dimmer is a pwm function performed by the bcm. I would just add a variable resistor to your new lights.

 

It's a 95 SL2, and yeah it'd probably be easier to add a new dial for the lights, im just being lazy and cheap trying to avoid adding one when the car already has one wired in for the rest of the interior lighting.

 

95's most definitely do not have BCMs, so no luck there.

I'm thinking when it says it's going to HVAC it means the lights on the front panel of the HVAC head (2 bulbs I believe) and then it will (guessing) prob go to the connector for the radio (to dim the back light), then on to the inst cluster to dim the dash, etc.

I don't know what the total resistance is for the DIM ILLUM circuit turned all the way down (max resistance), but the question will also become how much does that total resistance change when the LEDs are added in series.

Basically what I'm getting at is that the RANGE of the variable resistor in the DIM ILLUM circuit was chosen based on the resistance of the total circuit.

Adding the LEDs MAY change the optimal resistance range such that the LEDs do not dim at the same rate when you turn the dim ****.

Prob better to play with a few resistor pots and add a separate one in.