Please give function of C5185C chip

[kelticwizard]

Okay, this isn't audio but it is electronic parts, so I stuck it here.

This is a control system out of a car.

A) Can anyone tell me what the function of the C5185C chip is here-the one with the big X on the left?

The three terminal chip is a Motorola D45H11, and is a transistor.

B) What is that long wirewound thing on the left-a wirewound resistor? It's labelled A3. Seems to be about 2 inches long.

I've built some small amps and signal generators, but as you can see, there are some large gaps in the knowledge.

 

[kelticwizard]

By the way, when I say "function", I do not mean specifically in this circuit.

I mean what does a C5185C do? Is it a power supply chip, a microcontroller, or what?

I googled and all I came across was places that had the chip, without going into specifics as to what kind of chip it was.

Any general guidelines here would be appreciated. Thanks.

 

[pinkmouse]

Try Alldatasheet. I searched under 5185 and got a selection of devices. Now all you have to do is download the datasheets and compare pin numbers etc.

 

[pinkmouse]

BTW, what exactly did this circuit do?

 

[davesaudio]

My guess (only a guess ) looks like an exar chip
exar makes function generators /timers?

the other "thing" - resistor or delay line?

a good mystery and better than TV

 

[Leolabs]

try www.datasheetarchive.com

 

[kelticwizard]

Thanks, guys, but neither one of those links seemed to lead to the chip in question. I almost feel like emailing one of the houses that sells the chip just to find out what it is, lol.

The board in question is from a seat belt controller system from an old Ford. Those models had a shoulder belt system where the top seat belt anchor slides forward along a track to allow the driver and passengers to leave and get into the car, then slides back and belts them in when the doors are closed and the car is ready to be driven.

The system frequently malfunctions, as is happening here. although I don't think it's the controller board-I think it is a relay component integral with a slightly broken lock.

Anyway, thanks for the effort and tips.

And yes, I do wonder what that slender wirewound thing is. Hmmmm.....

 

[ocool_15]

well a wire wound thingy is generally
Inductor
wirewound resistor
Antenna

I wound guess its a inductor, I dont see why you would need a antenna in that application, though the shape is more indicative of being an antenna to me.

 

[davesaudio]

If there are no switches for end travel than maybe it is the
inductor/resistor across which current spike sensed, indicating end of travel/ motor stall

 

[cpemma]

I suspect most of these chips you can only find at hkinventory and the like are custom-made to do a job it might otherwise take 2 or 3 to do. It's not all that expensive if you want a few tens of thousands...like Ford.

I tried to trace one I found in a PC case fan - several listings, no (free) details or (free) datasheet.