R33 GTR HVAC Blower Motor Issue

[BlueBOB]

Purchased my 95 R33 recently and I bought it knowing the blower motor did not work. Pulled the dash a couple of days ago, which was pretty fun actually, and turns out I didn't have to go that far as the issue was quite clear once I got close.  Some previous owner cut the wire to the harness all together!  Any ideas why someone would do something this dumb? I should be able to rewire it pretty easily, but the fact that it's been cut like this scares me quite a bit.

 

Included pic of dash removed just for giggles. I'll likely create a separate post for the other scary looking things I've discovered. There are some extra wires around. Some are for what appears to be an aftermarket alarm or key fob setup and maybe aftermarket stereo stuff...?

[tridentt150v]

Might have been a turbo timer....big 'go fast' must have in the early 2000's 😂

At least you have the chance to have a good look at what lies beneath while the dash is out, hope all your fixes are as easy for you as the cut wire one.

[BlueBOB]

Sadly fixing the wire and plugging it back in didn't work. Ordered another blower motor from the UK and a brand new fan controller amp. The motor didn't turn on either, so hoping the fan controller amp does the trick. It arrives tomorrow. The confusing part is that there is definitely power getting to the motor.

[GTSBoy]

On 8/23/2021 at 9:21 AM, BlueBOB said:

The confusing part is that there is definitely power getting to the motor.

Most loads are switched on the earth side, meaning that there is usually power at the load itself.

[BlueBOB]

On 8/22/2021 at 7:19 PM, GTSBoy said:

Most loads are switched on the earth side, meaning that there is usually power at the load itself.

Interesting. Good to know. Again, praying this stupid fan controller amp does the trick. Any good way to test the earth side?

[Duncan]

Also keep in mind the issue could be in the climate control display or the wiring between the 2, not just the module

[GTSBoy]

On 8/23/2021 at 9:59 AM, BlueBOB said:

Any good way to test the earth side?

Yuh. Get the wiring diagram and work out where the power comes from and what has to work (wiring, switches, relays) between the +ve supply, the load and the -ve rail for the motor to switch on. If you can prove to yourself with basic electrical diagnostic techniques (checking for continuity, measuring voltage at different points in the circuit, confirming that switches open and close when required, etc) you will either find what is not allowing it to work or you will eventually come down to the motor/load being dead.

[BlueBOB]

All fixed!  Obviously the wiring harness being cut was a problem. With that repaired, I was able to test it was getting power as previously noted, but still no fan.  Based on research I had ordered a used blower motor from the UK off ebay and a brand new Fan Control Amplifier which a number of posts claimed to be the sneaky issue (ebay link to part below).

 

JDM Nissan R32 Skyline S13 Silvia Blower Fan Control Amplifier 27761-01U00

 

I received the blower motor first and when I plugged it in, still no fan.  The amp arrived a few days later and that was the culprit.  The interesting thing is that this part is the part number for the R32, however one post I read indicated that the R32 part would fit in an R33 and I had all kinds of trouble finding the R33 part number for some reason.  This part fixed the issue immediately and all is well. I also had to repair my actuator motor like so many others have to do.  Now I get to have the fun of putting the dash back together.