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7 minutes ago, niZmO_Man said:

Where is it located? Maybe show a zoomed out picture? Follow the wires?

It's located under the steering wheel. I have uploaded a zoom out picture. Yeah i will just follow the wire. Do you think it could be adaptive Front-lighting System?

IMG_0192.jpeg

16 hours ago, Jeets said:

adaptive Front-lighting System

My BMW has a switch for realigning headlights according to load. Later Nissans had it also, is this the early version? Have you tried it out in the dark, point the car at a wall and see what the headlights do when you activate it.

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Oh my god ! 

"Wouldn't press it if i was you."

That's going against human nature !

Its in humanity's make up to press that button.

If there the was a big red button marked:-

"END OF THE WORLD BUTTON DO NOT PRESS"

Before you could turn your back . . . . . . someone would just to see what happens.

So, this thread was funnier to me until I picked up the Fuga today, and it had that button too.

Anyway, after some quality time with the paperwork (yes, an import that actually came with original papers!), it is a button related to the option ultrasonic alarm.  I also have an extra "security" led on top of the steering column.

So, turn the switch on, headlights to auto, lock car and walk away. Approach with key on you after dark, and an LED lights up the driver's door handle so you can find it and unlock it using the door button. 2021-02-20 20.23.30.jpg

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    • Bit of a pity we don't have good images of the back/front of the PCB ~ that said, I found a YT vid of a teardown to replace dicky clock switches, and got enough of a glimpse to realize this PCB is the front-end to a connected to what I'll call PCBA, and as such this is all digital on this PCB..ergo, battery voltage probably doesn't make an appearance here ; that is, I'd expect them to do something on PCBA wrt power conditioning for the adjustment/display/switch PCB.... ....given what's transpired..ie; some permutation of 12vdc on a 5vdc with or without correct polarity...would explain why the zener said "no" and exploded. The transistor Q5 (M33) is likely to be a digital switching transistor...that is, package has builtin bias resistors to ensure it saturates as soon as base threshold voltage is reached (minimal rise/fall time)....and wrt the question 'what else could've fried?' ....well, I know there's an MCU on this board (display, I/O at a guess), and you hope they isolated it from this scenario...I got my crayons out, it looks a bit like this...   ...not a lot to see, or rather, everything you'd like to see disappears down a via to the other side...base drive for the transistor comes from somewhere else, what this transistor is switching is somewhere else...but the zener circuit is exclusive to all this ~ it's providing a set voltage (current limited by the 1K3 resistor R19)...and disappears somewhere else down the via I marked V out ; if the errant voltage 'jumped' the diode in the millisecond before it exploded, whatever that V out via feeds may have seen a spike... ....I'll just imagine that Q5 was switched off at the time, thus no damage should've been done....but whatever that zener feeds has to be checked... HTH
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    • Hah, fair enough! But if you learn with this one you can drive any other OEM manual. No modern luxury features like auto rev-matching or hillstart assist to give you a false sense of confidence. And a heavy car with not that much torque so it stalls easily. 
    • Actually, I'd say all three are the automatic option. Just the different trim levels. The manual would be RSFS, no? 
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