Question about Saturn Relay

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On car relays the ones with 4 or 5 pins how do tell if they are normally closed or normally open.

I know they have a little drawing on them but how do you tell by the lines on them.I know one if you give it volts it will not have any resistance,and the other will.Does anyone know?

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  • xkikbxr Dec 24, 2014

    Here is a link to a NO / NC diagram. Hope it helps.



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There may be symbols on the relay that will indicate NO or NC. The only other way to tell is if you buy the electrical repair manual for your car. The information in the schematics will show NO or NC. Taking the relay and testing it will tell you what it's doing right then. Using a DVM and testing continuity, if it's unplugged and and testing across the legs it shows all zeros it means that the circuit is complete and there is no resistance from point A to point B, but once power is put to the relay, if the same legs now show resistance (Numbers jumping up and down or anything other than zero, then your circuit is open.

Posted on Dec 13, 2014

Testimonial: "What I wanted to know on the relay itself how can you tell by the diagram if it is a normally open or normally closed"


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On a relay for a car I know there is normally closed and normally open what I want to know on the relay itself it has 1,2,3,4,or 85,86,87,87a,30 now on the diagram how do you tell if they are a normally...

The diagram usually displays the relay when there is no power applied. The normally open contacts are the ones not making contact until the power is applied. So, for the normally closed ones, the contacts touch until the power is applied to the relay. I hope this is the explanation you are looking for. Take care!

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Wiring diagram

are the A/C fuses good? what transmission, auto or stick?
the first check is , does the compressor, cultch, engage
and spin the actual compressor main shaft at full speed.
yes, then loop is bad. (freon loop) (fan good)
No, then below is wrong. (electrical)
did you check pressures yet?
if not , then the hi/low limit switch may be open killing the compressor
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the High low switch if open kills DC power to the A/C main relay. coil.
coil yellow wire must be at 12vdc or the loop has wrong pressures.!
dig,. it refuses to destroy its self. so kills the relay.

all posts, USA.
does the A/C lamp on dash turn on? if not the blower is dead.!
on the 94,(i dont have 93 drawings)
you can get better drawings for 94 at, any time.
yellow wire is hot. (clutch dead)

the next point of failure is the car has throttle pedal switch
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so this switch can fail and cut A/c (USE A VOLTMETER) opens.
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inputs that can stop A/C compressor, are:
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4: pin 4 and 10 , evap core iced up cut, thermister sensor.
5: pin 8, lost 12vdc power.

The TCM cut out , to pin 5 is just for automatic trans, with TCM shifter electronics, it sends cut when the trans detects overload.
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1 Answer

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2 fans behind RAD
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my online source has 30+ pages of schematics
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it looks to me , (A/C drawings) that the PCM and A/C amp can both
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1 Answer

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  • 4 Touch the probe tips to the pins that connect to the relay coil. The meter should read between 50 and 120 ohms. If not, the relay coil is bad.
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