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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Wed, Jul-20-2016, 05:50:02 AM   #21
jgrotkier
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Default Re: How to (actually) wire up a SPAL fan to the aux controller

I hate to bump an old thread, but do you still have the pictures from the original post? The links are all dead now :-/
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Old Wed, Jul-20-2016, 02:16:29 PM   #22
Drewster
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Default Re: How to (actually) wire up a SPAL fan to the aux controller

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Originally Posted by jgrotkier View Post
I hate to bump an old thread, but do you still have the pictures from the original post? The links are all dead now :-/
ruh-ro, i'll fix it here in a sec (edit - fixed!)

Last edited by Drewster; Wed, Jul-20-2016 at 02:24:13 PM.
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Old Wed, Jul-20-2016, 09:00:11 PM   #23
jgrotkier
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Default Re: How to (actually) wire up a SPAL fan to the aux controller

Awesome, thanks!!
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Old Wed, Jul-20-2016, 09:03:44 PM   #24
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Default Re: How to (actually) wire up a SPAL fan to the aux controller

Awesome write up, very much needed !!
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Old Thu, Jul-21-2016, 04:42:19 AM   #25
jgrotkier
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Default Re: How to (actually) wire up a SPAL fan to the aux controller

I just want to make sure I understand this, for some reason this stuff hurts my head.

So, in your diagram do you have the relay trigger + (orange) going to the 12v lug, as well as the main power (yellow), if I'm reading it correctly. Is that so the fan can turn on when the ignition is off? if I didn't want to allow that, could I hook the orange to an ignition + wire?

Also, why is the fuse between the fan and relay (red wire) rather than on the yellow wire?

Thanks again!
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Old Thu, Jul-21-2016, 12:45:03 PM   #26
Drewster
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Default Re: How to (actually) wire up a SPAL fan to the aux controller

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Originally Posted by jgrotkier View Post
I just want to make sure I understand this, for some reason this stuff hurts my head.

So, in your diagram do you have the relay trigger + (orange) going to the 12v lug, as well as the main power (yellow), if I'm reading it correctly. Is that so the fan can turn on when the ignition is off? if I didn't want to allow that, could I hook the orange to an ignition + wire?

Also, why is the fuse between the fan and relay (red wire) rather than on the yellow wire?

Thanks again!
Yes, you can route them to switched power if you so choose - just make sure you don't overwhelm whatever circuit you go with.

The fuse is on the red wire since that's where SPAL indicated and it's really easy to splice in there. Technically it protects an over-draw from the load in either location since that's the same current loop. If you really wanted, you could place the fuse right on 12V power to ensure nothing on the circuit (chafed wires, etc.) can cause too much of a problem (although 30A can cause plenty of problems)
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Old Wed, Jul-27-2016, 08:39:14 PM   #27
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Default Re: How to (actually) wire up a SPAL fan to the aux controller

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Well, yes and no - the DME definitely uses coolant temp, but it also uses:
-Calculated catalyst temp
-Vehicle speed (don't really need a fan at 70mph)
-Battery voltage
-A/C Pressure (calculated)

Watching the signal with an o-scope, even when the car isn't fully warmed up, you can engage the A/C and watch it ramp up to about 50% (which is enough to fire up the main fan's relay).
Do you remember the frequency of that PWM signal? I was going to try that low pass filter (RC/RL) you mentioned in another post to trigger second e-fan to only come on at 100% duty cycle reading from PWM.

Thanks!
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Old Wed, Jul-27-2016, 09:20:40 PM   #28
Drewster
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Default Re: How to (actually) wire up a SPAL fan to the aux controller

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Do you remember the frequency of that PWM signal? I was going to try that low pass filter (RC/RL) you mentioned in another post to trigger second e-fan to only come on at 100% duty cycle reading from PWM.

Thanks!
I do not, but hopefully I can check it this weekend.

That being said - you'll need more than just a filter, you'll need a "not" circuit since the PWM signal is inverse. In other words, the ECU commands 100% (full power) by sending a 0V signal, and it sends 0%(off) via full 5V.

If you're using the SPAL relay, you'll also need to make sure your circuit is capable of driving the *12V* relay while isolating the 5V DME. Not a big deal if you know how to choose and bias a transistor, just giving you a heads up...
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Old Thu, Jul-28-2016, 02:35:01 PM   #29
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Default Re: How to (actually) wire up a SPAL fan to the aux controller

I am using the SPAL relay but I was hoping to stay on the output side of the PWM (grey wire) to avoid any mishaps with the ECU.
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Old Thu, Jul-28-2016, 02:53:35 PM   #30
Drewster
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Default Re: How to (actually) wire up a SPAL fan to the aux controller

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I am using the SPAL relay but I was hoping to stay on the output side of the PWM (grey wire) to avoid any mishaps with the ECU.
Are you talking about using the grey wire between the Aux controller and the fan motor? That won't work - the controller switches ground (brown wire). If you were to connect the relay to be powered by the grey wire, the fan would just run until the battery dies since it's a constant 12V.
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Discussing How to (actually) wire up a SPAL fan to the aux controller in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)