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The mkiv Supra Owners Club

New heater matrix fitted, now no AC/heater power


Jake

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does the cig lighter work?
Well it has 12v power, I tested the plug with a voltmeter just now.

 

If so id get the heater control out and do a Volt check on the plug.
How do I do that? Which pins am I supposed to see a voltage across?

 

I've undone the heater control from the dash so that I can plug it in without having to struggle with with removing the dash panel each time I look at something.

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Nope :( I'm struggling with it again right now.

 

 

I have power to :

Headlights, Wipers, Cig Lighter, rev counter, boost gauge (stock one), fuel gauge, elec door mirrors, horn,

 

I DON'T have power to :

Heater controls, speedo/rev counter panel lights, Highbeam warning lights.

 

The indicators don't work from the indicator stalk or the Hazard Lights button but they do flash when the alarm is armed/disarmed (the green indicator light on the dash do the same)

 

 

I'm stumped ! :(

 

 

If you can power the flashers from the alarm but not either of the function switches i would think it may be a dodgy relay, maybe something has been disturbed, i would make sure all relays are pushed up snug and then i would try the connections behind the dash (you say the fuses are ok):search:

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Do your hazards work? Myself and JamieP have had the same problem in the past.

 

For us it was the plug that plugs into the hazard warning lights.

There is actually 2 plugs up there and they are different sizes. One fits in bit isnt the right one.

IIRC it might hae been blowing a fuse in the footwell too.

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I have a cunning plan to test the heater controls. I'm going to plug it into the dash on my other Supra.

Well, the heater controls work fine in my other Supra, so it's not that.

 

 

 

 

Looking at the three plugs into the back of the instrument cluster ;

the white one goes behind the speedo?

brown one in the middle behind the rev counter?

and the blue one goes on the right hand side behind the fuel gauge.?

Correct?

 

And the middle socket, the one the brown plug goes into has no contacts/PCB-tracks to connect with the pins on the brown plug, is that right?

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well done bud its an absolute pain to get at ive just finished mine last week, but i couldnt get mine to start at all turned out that i hadnt clipped the little white clippy thing down on the orange plug near the ecu propperly. :banghead:

 

Do you mean the one I asked you if you had checked and you said yes you had?

http://www.mkivsupra.net/vbb/showthread.php?p=1811761post1811761

 

:D

You're welcome!

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  • 1 year later...
Guest jimmy4lfc

Thanks JOHNNYW as i had the exact same problem with the clock, heater and cig lighter. Change the 7.5amp fuse on the cig slot and it should work. just sorted mine out after months of scratching my head!

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