AC Fan Relay

[Tapage]

I know that was not factory option in US 80 .. but since I'm pretty sure that all Toyota relays work the same maybe someone here can enlighten on how it works ..

My AC ( condensator ) fan stop working .. I notice it week ago and I was thinking that was the motor .. but not .. more testing drive me to think it's the relay .. if I close the circuit in the fuse ( engine bay ) box it work like it should be ..

here pic of the guy

I got V in port 4 and it should deliver to the port 3 that goes to the fan .. and make a bridge between 2 and 1 ports ..

all comments are appreciated ..

thanks

David

 

[9180ltd]

i dont have this option either but all relays need a trigger to activate... weather its a ground (toyota's perfered style) or hot. I would figure out how the relay is run via the fsm and test it. if it functions properly on the bench, that would lead to lack of trigger source.

 

[jonheld]

IIRC the condeser fan relay is the same part number as the EFI relay. Why not just replace the relay?

If you jump the load side of the relay, the fan will always run. If you jump the logic side of the relay you will most likely short the circuit that fires the relay.

 

[Tapage]

It's the same as any Toyota EFI relay ..

In my case ( HDJ80 ) got 12V in one port ( #4 ) and ground in port #1 when you activate AC port #1 got 12V and that should make the relay deliver 12V to the #2 port .. that it's not happening ..

I test the relay in my wife 80 and it works .. also test her AC relay in my 80 and did not work .. something weird here ..

That's why I wanna knnow how the relay should work and bench test both ..

 

[superjuice]

touch a 9v battery to the spade connectors, you should hear a click. the click signifies a closure of the contacts. I would swap the relay from the truck first

 

[Tapage]

I was testing it with 12V yesterday .. but ear nothing ... still not sure if FSM have a diagram/procedure to test 'em ?

 

[jonheld]

there's a diagram printed on the can of the relay with the pinouts.
On the bench, apply +12 to one side of the coil and ground to the other. The relay should click and you should have continuity between the other 2 pins.

 

[Tapage]

googling I got one diagram this one ..

it's clear to me that 2 and 4 should close and allow V to run inbetween when relay it's activated .. but 1 and 3 are close loop gnd or V .?

 

[TrickyT]

googling I got one diagram this one ..

it's clear to me that 2 and 4 should close and allow V to run inbetween when relay it's activated .. but 1 and 3 are close loop gnd or V .?

When you connect 12v across terminals 1 and 3 then the relay is energized and current can flow between terminals 2 and 4.

 

[Tapage]

When you connect 12v across terminals 1 and 3 then the relay is energized and current can flow between terminals 2 and 4.

clarification .. 12V in 1 and 3 port .. ?

What I got in my 80 it's constant 12V in one port and ground in other ( diagonal ) that turns in 12V when AC it's on ..

 

[TrickyT]

clarification .. 12V in 1 and 3 port .. ?

What I got in my 80 it's constant 12V in one port and ground in other ( diagonal ) that turns in 12V when AC it's on ..

By "connect 12v across..." I mean you connect +12v to terminal #1 and ground to terminal #3 to energize the relay. I have no idea what you mean by your reference to "diagonal". Maybe something got lost in translation.

 

[Tapage]

By "connect 12v across..." I mean you connect +12v to terminal #1 and ground to terminal #3 to energize the relay.

thanks Tricky was unsure abiut this point ..

I have no idea what you mean by your reference to "diagonal". Maybe something got lost in translation.

in the above pic 2 and 3 are diagonal as 1 and 4 too ..

 

[Tapage]

Thanks to your info Tricky I found the problem .. where should be a gnd ( port 1 or 3 ) was nothing .. I test the relay and was working as it should ..

I provide a new ground to terminal 1 and works ..

Now I need to check wiring diagram coz it's weird just miss gnd in that terminal .. it probably came from another ( temp ) sensor maybe .. that was no longer doing the job ..