[DML] Re: question for the experts about testing automotive electric devices

["welmoedj" <joe.dalton@xxxxxxxxxx>]

A regular AC to 12VDC power supply will do.
Computer power supplies sometimes need a load to start.
Hooking up a hard disk drive to one of the connectors usually does 
the starting trick.

Do not forget the buzzer also needs to be connected to GND to enable 
testing the signals.
Testing the switch itself can be done using a multimeter.

Look at the electrical diagram for the proper connections to test:
1: power, 2: open door, 3 and 4 seat belt switch, 5: GND, 6: 
accessory/contact ON. With the contacts of the connector on the upper 
side, pin 1 is the far left one.

If the buzzer is not working, first see to the connector contacts, 
they may have corroded. 
You could do as I did: replace the buzzer ith a more nicely sounding 
chime of later models cars (I used one of a Pontiac TransSport). 
Usually cheaply available at junk yards.

Welmoed.

--- In dmcnews@xxxxxxxxxxxxxxx, "Farrar Hudkins" <fhudkins@...> wrote:
>
> A computer power supply supplies +3.3V, +5V, or +12V of DC power to 
a
> device (depending on which leads you use). Could one test an
> automotive device's function using this power?
> 
> For example, if I wanted to test -- to pick a device at random -- 
the
> seat belt warning buzzer, could I take it out of the car and give it
> DC power from my computer to see if it buzzes?
> 
> Farrar Hudkins
> #2613
>




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