Quote:
Originally Posted by c4koh
So - should I look into it more? What does that capacitor (across the brake-pedal switch unit) is supposed to be doing??
Any 2c appreciated.
Steve
|
Maybe only a WAG but I believe it maintains the circuit for the ABS, EBCM and ASR functions. In real early cars Corvettes included there was a capacitor placed there for radio interference and you could induce a click into the audio/radio systems by pumping the brake pedal. A click - click! It is NOT I'm sure for that. C3's used them.
The wiring diagrams for early C4's with no ABS don't show that capacitor, I used an '84 wiring schematic to compare. I know that in later OBDII cars there are codes that rely on those circuits to be active but I don't recall ever seeing it in the FSM for the C4's. In your '92 FSM check, ABS, ASR sections. Maybe there is a reference to them there.
I just read this and I recall hearing it maybe before that if the stoplight circuit is energized in this fashion it relieves the stress on the switch and maybe also increases response to the stop lamps by milliseconds.
"Franke" it seems posted while I was tapping the keyboard similar thoughts!