Nissan Repair Questions? Ask a Mechanic for Answers ASAP
If you plug in the blower and check for power, do you have power on both of the wires at the connector?The white/green and the blue?
Ok, so key on there isn't any power on the white/green stripped wire at the blower?If there is, plug the motor back in and check to see if the power is then transfered over to the blue wire.
Also, did you put all the fuses back in and know they are good?
What color wire at the resistor has power?
I find that interesting because the switch doesn't provide power to the system.
Ok, red gets power from the BCM, but it's not the actual power for the blower, we have to try and determine why you don't have any power on the white/green. This is the power for the blower, then the switch provides the ground....so.
There are 4 fuses and one blower relay we have to try and figure out which is the problem.
Were the fuses you replaced in the fuse box under the hood or inside the cabin on the truck?
Ok, please check fuse 8 in the box inside the truck. This is the power for the blower relay that will get power to the blower once it activates.
I am sending along a diagram of your fuse box inside the truck so you know which fuse to swap.
Please let me know how you make out.
Next, we need to check for power at the blower motor relay. This is located up under the hood. Pull the relay and check the slots for power. The older relays had numbers on the bottom, I am not sure if this one will or not, but we are looking for power with the key on 3 of the 6 slots with it out. #'s are 1,5 and 7
Please check and let me know.
Sorry, wanted to send the diagram with the location of the relay as well.
You have power on 5 slots with the relay out and in your hand?
Also, does the relay have small numbers on the bottom of it?
Did you get the diagram I sent of the right relay? You can't or at least should not have power on any more then 3. 1,5 and 7 with the relay out of the socket.
Is this with the relay out of the socket?
Ok, first if you have power on 3 and 6 without the relay in, you have a short to power. These wires should not have power without the relay as the relay is the switch that connects #'s 3 and 6 to #'s 7 and 5. This tells me that there is power on 2 wires that should not have any power on them at all, ever, unless you are calling for the blower to work.
Now, #3 and #6 both are the power supply for the white/green stripped wire at the blower. So, you have power that should not be there under the hood, but it's not even making it to the blower under the dash. Somewhere along the way here, you have wires shorted together.
Now, I would ask that you look at the wiring by the parking brake pedal for any signs of damage. I believe there was a wiring harness recall for the BCM harness on this model due to some issues related to the harness hitting the parking brake lever and shorting out. If the truck hasn't been in an accident, then this would be logical.
Please let e know
No, the IPDM isn't part of the circuit. there could be an issue with the relay box under the hood. You could take it apart and check for corrosion that might be causing it.
The box under the hood where the blower relay is.
Not likely that it would be bad because it's suppose to put power to all the terminals when you turn on the ignition switch. You have a mess in the wiring somewhere between the relay and the blower motor. It has to be because you actually have power on the white green wires, but nothing inside the truck. The white green should not have any voltage at all with the relay out. Period, so if you have power on the slots for the white/green, you have something powering them up. Since the white/green doesn't have any power inside the truck at the blower, it indicates the wires are broken somewhere between the box and the blower.
You are very welcome and sorry I don't have any better news for you on this.
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