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Interior Dimmer Module pdf BMW E32, E34 und auch Ferrari. Kopiert aus dem Ferrari Chat, F430 DIY - Improve interior light with dimmer:
I tested many dimmers and studied several electronic schematics. None of them where satisfying enough to be implemented in a Ferrari and especially behind the M032 ECU. Dirty electronic modules would seriously mess up this ECU! My specs were quite severe: I wanted it programmable and configurable, ground based control (I initially thought that we would need a +12V based control), almost no power consumption in standby mode, limited heat at the heat sink and a PWM based control (Pulse Width Modulation).
On a good day, I discovered on a BMW forum a guy from Japan who is making what seemed to be the perfect dimmer. I got in contact with him and after many email exchanges and studying his schematics, I got convinced that we have here the right product. His module is entirely programmed using a PIC12F629, just perfect! The MOS FET used is a 2SK3140 using a 4V gate and is attached to a small heat sink.
Here a the characteristics of this dimmer module :
- Support of normal bulbs or additional LED’s
- Maximum control of 200W (15A)
- Standby current drain of 1mA
- A noise signal is applied to prevent line noise from generating false-starts or miss-functioning
- Uses a digital IC (PIC12F629) to realize control by PWM adjustment
The dimmer module has 4 wires
- white : OUT ground to the dome light and LEDs
- yellow : IN delayed ground from the M032 ECU
- red : +12V HOT (module power)
- black : ground (module power)
The dimmer module can be configured using DIL switches :
- SW1 OFF : LED + normal bulbs
- SW1 ON : normal bulbs
- SW2 OFF : Fade In time of 0.5 secs
- SW2 ON : Fade In time of 2 secs
- SW3 OFF – SW4 OFF : Fade out time of 2 secs
- SW3 ON – SW4 OFF : Fade out time of 4 secs
- SW3 OFF – SW4 ON : Fade out time of 6 secs
- SW3 ON – SW4 ON : Fade out time of 8 secs
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