Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Hi there! It is likely something else. The resistor is by passed when you put the blower switch on high. Do you have a test light?
No but I have a meter
Meter will work, one moment while I pull up the wiring diagram. I assume this is manual climate control?
no, this is automatic
Ok, there is no resistor in the auto a/c system. The part you removed, is it square?
thought i read somewhere the resistor has an internal non resetable fuse. Is this a possibility?
The resistor doesn't
It is just a flat card with resistors to slow the voltage so the fan will opersate at lower speeds
Is it a flat 4 pin card type thing?
it looks very much like the part you have highlited. # XXXXX part: 2W6003F 03
there are 3 pins
Ok, it's all good as long as we are talking about the same part so we can test it!
Ok, I want to have you check for power on the wiring harness to the fan amp. Terminal 2 with the key on, check the blue/yellow wire for power to it and let me know. I will wqait
the blue/yellow wire is much smaller guage than the other 2 wires and has 9v to ground
the blue/white wire has 12volts to ground
the black has 0v
OK, so far so good. Plug the fan control amp back in and backprobe the blue/yellow for voltage and let me know
ok, Next check the white/blue wire at the blower for power
do i need to remove the glove box?
Only if you can't see the wiring to the blower motor itself. It is a 2 wire connector, if you can get to it then no
if i have the right one there is 12v at blue wire. the other wire is white
white wire also has 12v
Ok, one more test my friend, unplug the fan amp again and check for continuity between the white wire at the blower and the blue/white wire of the control amp harness
that is normal until the fan is switched on
continuity exists both with ignition on and off
btw, all the tests you asked for, i did with ig "on"
Ok, that's good. I lied though, I have a couple more tests to try. I would like to have you plug it all back in and see if the white wire goes to ground with the key on and the fan switch on. Sorry, I am not normally I liar but I want to get this right!
no prob. are u asking if white has continuity to ground when system switched on?
the fan amp supplies the ground
it has to lower the voltage, but the blower has a constant 12 volts
white goes to ground
Well, I suspect the blower is shot at this point. You can verify by removing it and then putting battery voltage and ground to it. If it doesn't blow, then it isn't going to move
ok i will try that. i suspect 12v to blue terminal and grd the other? or does it make a difference?
It won't really matter out of the car. It seems like everyone is doing their job but the blower at this point
any tricks on getting it out
I think it is just three bolts and it should drop out for you
i ran a jumper without taking it out and the blower worked
re-tested white to ground continuity and checked out again
Ok, I think I have taken you as far as I can without being there. At this point I would suspect a sensor. Temp sensor or something maybe or the panel itself not kicking things on. You could try the fan amp, but I can't promise it will solve the problem,
I mean it seems to me that if you have power and ground the blower should work
you just gave it power and ground and it worked?? makes sense right
anyway you can send me schematics?
There is no clear wiring diagram or I would
i just tried jumping white from blower to ground and blew both fuses
So that would make me think the blower is no good and shorting inside
wouldn't it have blown the fuse initially if this was the case?
This would, but I see no other explination to be honest.
didnt you say that the blower gets it's ground from the fan amp?
yep it does
it has constant power
I am going to open this back up for the other experts. Possibly one has had this type of problem
I have not replaced the fan control amp. I did however find a site online that explains how to troubleshoot it and it seems to check out ok. It is sending 12v to the blower but blower doersn't seem to be getting a good ground. When if jump the white wire on the blower to ground, it blows the fuses.
still a little leary of the fan control amp, it has signs of heat, but like I said it seems to check out.
Thanks for your input.