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Old 12-19-2009, 11:00 AM   #1 (permalink)
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Question No Power To Heater Relay Need Diagrams!

New here in desperate need of help...cause I'm bout to freeze my nuts off! Got a 89 Pickup 22RE 4wd 5spd has A/C etc. Several nights ago the blower motor just quit working. I'd like to think that I know a thing or two about cars/trucks and know most of my basics and such about wiring. I've tore the lower dash completely apart and have started checking things. After a little research I figured no biggie just a blower resistor,installed a new one and still no fan at all. I started last night trying to trace all my wiring but can't hardly do so because its so tightly tied up and loomed.

I have NO power to the heater relay on the passenger side fuse panel,NO power to the resistor and NO power to the blower motor. Next figured it had to be the heater control switch so I pulled the switch apart and no signs of massive wear on the contacts or anything,cleaned it real good tossed a metric shit ton of dielectric grease in and put it all back together. I have power at the switch connector or at least to burn the small bulb but do not know which wire sends power further down the line. As far as I know from not seeing a diagram power comes direct from the blower switch,to the heater relay(should hear a click from the relay right?) then to the resistor down to the blower motor am I correct? A wiring diagram would be great to have right now! I know it could still be the fan switch if no power is going to the relay but is there anything else in line that would be blown before the relay?

If nothing else I'll jump a wire to at least get power further down the system to make sure the blower motor is till working etc...help a Yota brother out guys its colder than a well diggers asshole in Idaho here an without heater...well just sucks

Jimbo
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Old 12-19-2009, 11:25 AM   #2 (permalink)
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My '93 T100 is not the same as your truck, but it's still a Toyota. Look in the under hood fuse box, where you may find a heater fuse. Mine has the heater relay and a 40A fuse in that box. It should be labeled if you have a heater fuse in there.
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Old 12-19-2009, 11:35 AM   #3 (permalink)
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Yes sir but on my little turd the heater relay and fuse is behind the glovebox on the passenger side and thats where I can't get any power. There is not a relay or fuse under the hood from what the FSM says or even a fuse for the heater in the fuse box on the driver side footwell
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Old 12-19-2009, 12:19 PM   #4 (permalink)
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I found a wiring diagram at Autozone for the '89 pickup. I can't link to it due to forum rules, and besides that, you have to register at the site. It says the heater relay gets it's power from the gauge 10A fuse, then it runs through the integration relay to the heater relay. You may want to check those items.

Let us know what you find.
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Old 12-19-2009, 07:14 PM   #5 (permalink)
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Did you ever considered that maybe the blower motor is shot?
Have you tried applying 12V directly to it to see if it works?
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Old 12-20-2009, 12:16 AM   #6 (permalink)
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Cool

Oh yea the blower motor is fine I jumped it all and everything was working great. I just got done with it tonight and had to use the last resort. I finally found that the white wire to the heater relay was the main hot coming to it and when the switch sent power to the black/orange wire it closed to make a complete circuit to put power to the fan and resistor. I had no power to the white wire at all at any time. I traced on that wire for 2.5hrs and finally gave up unless I wanted to cut into the main harness under the dash. From the diagrams dj99 directed me to(THANKS A TON MAN!!!!!!!!)it seems that the white is the constant hot to the relay so I finally said to heck with it and jumped direct from the battery to the white wire and spliced in to get my power and just to be safe put a inline fuse just in case. Everything seems to work great now at all speeds,motor,resistor,relay etc after sitting running wide open and on medium settings doesn't even get hot... Tomorrow I reckon I'll get to put all the interior crap back inside the truck. Feels great to have that warm fuzzy feeling inside the cab again LOL Thanks for all the help with the diagrams dj99 make a trip to Bama an I'll buy ya a beer
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Old 12-20-2009, 05:22 PM   #7 (permalink)
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OK, good to hear it's not the blower, and you worked it out. And good call on the inline fuse !!
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