06-27-2016, 10:20 PM
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#1
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Blower motor control diag
Hello all,
Does anyone have the wiring schematic available for the blower motor control on 1997 sr5 ? Mine has stopped functioning on the lowest speed. All other speeds work fine. It's been my experience that when the resistor fails all speeds other than high do not work. Thanks in advance for any help you can give ,
Matt
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1997 t4r sr5
lots of 2 wheeled toys
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06-27-2016, 11:12 PM
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#2
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1989 FJ62 5.3 Chevy, FZJ80 Axles, 4.88's with ARB.
2000 2wd runner, 4 cylinders, yes it IS slow.
1999 4WD SR5 Desert Dune 3.4 351K and counting.
2000 4WD sport 3.4 Elocker <--My son's but I still end up paying.
2001 2WD SR5 3.4 <-- My daughter's...see preceding line.
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06-27-2016, 11:26 PM
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#3
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So the resistor could be at fault. Either an open at on the last 'leg' of resistor or faulty ground wire coming out of resistor to ground or the control switch isn't energizing the relay in 'low' position. I imagine this is very similar to what I have. Hopefully TheDurk can chime in. This gives me a good starting point though! Thanks ,
Matt
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1997 t4r sr5
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06-28-2016, 12:13 AM
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#4
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Quote:
Originally Posted by IBallEngineer
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'97 is the black hole in my EWD collection. I have '96, '98, '99, '00 is same as '99, '01 is same as '02, and '02 is on-line for everybody. '97 I got nuttin.
But in this case, '96 and '98 are the same as '02 for blower, switch and resistor so just go with what was posted.
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'99 4Runner SR5 5spd 3.4L V6 4WD(U.S), original '99 Talls in front, OME 906s in back, Hella fogs, Trekmaster shocks in front, Billy in back, no running boards, FIAMM horns, Alpine sound, Michelin LTX M/S2's, owned since new.
'97 HiLux SW4 5spd 4WD(Japan model bought in Brazil assembled in Argentina, very close to a 3.0 4Runner/Surf)
'71 FordWillys Jeep CJ5 (with straight six Ford Maverick 3.0 liter engine--lives in the mountains north of Sao Paulo Brazil)
My Backyard Frame Swap
Last edited by TheDurk; 06-28-2016 at 12:16 AM.
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06-28-2016, 12:21 AM
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#5
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So continuity check between pins 1&8 of blower switch, with switch in low position. That will tell if it's the switch. Continuity between 1&4 of the resistor, not sure what I will see there but as long as it's not 'o.l' should be good and then the ground wire from pin 1 of the resistor connector to ground for continuity. Missing anything ?
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06-28-2016, 01:26 AM
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#6
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Well, the full check of the switch is spelled out:
8-1 : Closed with blower SW at LO position
8-6, 1 : Closed with blower SW at M1 position
8-5, 1 : Closed with blower SW at M2 position
8-4, 1 : Closed with blower SW at HI position
But you have scoped it out pretty well. If the relay energizes in LO, its the last leg of the resistor or the wire to T1. If it doesn't, it's the switch. Good luck!
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'99 4Runner SR5 5spd 3.4L V6 4WD(U.S), original '99 Talls in front, OME 906s in back, Hella fogs, Trekmaster shocks in front, Billy in back, no running boards, FIAMM horns, Alpine sound, Michelin LTX M/S2's, owned since new.
'97 HiLux SW4 5spd 4WD(Japan model bought in Brazil assembled in Argentina, very close to a 3.0 4Runner/Surf)
'71 FordWillys Jeep CJ5 (with straight six Ford Maverick 3.0 liter engine--lives in the mountains north of Sao Paulo Brazil)
My Backyard Frame Swap
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06-28-2016, 09:49 AM
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#7
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@ Stiles97
I'm at a loss for words. Usually
@ TheDurk
and I are offering help to forum members who ask for help then start replacing the ECU to solve the left headlight issue.
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1989 FJ62 5.3 Chevy, FZJ80 Axles, 4.88's with ARB.
2000 2wd runner, 4 cylinders, yes it IS slow.
1999 4WD SR5 Desert Dune 3.4 351K and counting.
2000 4WD sport 3.4 Elocker <--My son's but I still end up paying.
2001 2WD SR5 3.4 <-- My daughter's...see preceding line.
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06-28-2016, 10:09 AM
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#8
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The resistor is for 1,2 and 3 speeds only. 4th speed is direct 12 V to the motor.
There are 4 wire pins. One is the supply 12V. Through the first resistor coil you get the 3rd speed. with the first and second resistor coils in a series you get the 2nd speed and with all 3 coils in the series you get the lowest speed.
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06-28-2016, 10:12 PM
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#9
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So it is in fact a faulty blower motor resistor. Will post some pics of the resistance reading on the working portions in case others may find it useful. But here is the resistor as I took it out of the housing. Thanks to TheDurk and Iballengineer for the help !
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06-28-2016, 10:15 PM
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#10
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Pin 4 to pin 2 of blower resistor measured 0.6 ohms
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06-28-2016, 10:18 PM
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#11
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Pin 4 to pin 3 measures 1.0 ohms
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06-28-2016, 10:24 PM
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#12
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Then the last reading( the one I was most interested in ) between pins 4 and 1 measured 2.88 m ohms. Although there is a reading, it is so high that it is essentially an open circuit and the cause of the blower motor not working on the lowest speed setting. Even though it's a cheap enough part to just throw at it, it's nice to know for sure. Thanks again for the help ,
Matt
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06-30-2016, 08:48 PM
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#13
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Got the new resistor installed and everything is good now. Little time and $20 bucks and it's fixed 😎
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11-30-2016, 02:20 AM
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#14
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Thanks for sharing this info guys, mine doesn't work on "Lo" either. My fan seems obnoxiously loud on the other speeds too.
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11-30-2016, 08:26 AM
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#15
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Quote:
Originally Posted by FreshYoungDude
Thanks for sharing this info guys, mine doesn't work on "Lo" either. My fan seems obnoxiously loud on the other speeds too.
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My guess would be that you have debris ( leaves / pine needles) in the blower motor housing along with a faulty resistor. It's fairly easy to inspect.
Matt
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