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Old 10-05-2009, 10:39 PM   #1
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Default NB HVAC in an NA

So I'm swapping an 99 interior into my NA (I know the dash is heavier) but I'm stuck with wiring the HVAC. I found this thread on m.net but I just don't understand it. Hopefully someone here does.

NB HVAC controls INSTALLED in NA - MX-5 Miata Forum
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Old 10-05-2009, 11:35 PM   #2
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So far I've got the lights to work and the fan to work in all 4 speeds. The a/c compressor isn't kicking on though.
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Old 10-05-2009, 11:39 PM   #3
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The a/c switch completes a ground. Add a ground jumper and see what happens.
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Old 10-05-2009, 11:45 PM   #4
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Quote:
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The a/c switch completes a ground. Add a ground jumper and see what happens.


To which of the 3 wires? There's a pink, black/blue and blue/yellow one.
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Old 10-05-2009, 11:48 PM   #5
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Hablas espanol?
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Old 10-05-2009, 11:54 PM   #6
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http://neomiata.com/garage/1999_Miat...20Diagrams.pdf

page 2. nothing goes directly to gnd. they are all interlocked.
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Old 10-06-2009, 12:30 AM   #7
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I'm stumped. The directions on m.net say to connect AP5 to BP3, but there is no P3 if I'm looking at it correctly.
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Old 10-06-2009, 09:07 AM   #8
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Quote:
Originally Posted by y8s View Post
http://neomiata.com/garage/1999_Miat...20Diagrams.pdf

page 2. nothing goes directly to gnd. they are all interlocked.
True. But if you follow the diagram, the Pink is V+ for the a/c on LED and is hot key-on. When you push the a/c button, the pink and the black/blue are connected to blue/yellow. blue/yellow is a (shitty) ground.
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Old 10-06-2009, 10:43 AM   #9
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Quote:
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True. But if you follow the diagram, the Pink is V+ for the a/c on LED and is hot key-on. When you push the a/c button, the pink and the black/blue are connected to blue/yellow. blue/yellow is a (shitty) ground.
According to the instructions on m.net the blue/yellow wire needs to go through a diode, should I still try grounding it?
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Old 10-06-2009, 10:56 AM   #10
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Quote:
Originally Posted by Ben View Post
True. But if you follow the diagram, the Pink is V+ for the a/c on LED and is hot key-on. When you push the a/c button, the pink and the black/blue are connected to blue/yellow. blue/yellow is a (shitty) ground.
confusing at the least because there's two blu/yel and one goes to a 30A fan fuse!?

but yeah it looks like the Blu/yel out of the AC circuit goes to ground via the fan speed switch.

ben, do you call it shitty because it only goes directly to gnd in fan 1, otherwise it's thru a resistor?
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Old 10-06-2009, 10:59 AM   #11
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Quote:
Originally Posted by levnubhin View Post
According to the instructions on m.net the blue/yellow wire needs to go through a diode, should I still try grounding it?

That makes sense. No, don't touch the blu/ylw

Ground the blk/blu and the a/c comp should kick on. Ground the pink and the diode should light up.
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Old 10-06-2009, 11:11 AM   #12
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Quote:
Originally Posted by y8s View Post
confusing at the least because there's two blu/yel and one goes to a 30A fan fuse!?

but yeah it looks like the Blu/yel out of the AC circuit goes to ground via the fan speed switch.

ben, do you call it shitty because it only goes directly to gnd in fan 1, otherwise it's thru a resistor?
Took me a minute to find what you're looking at. Yes, you are correct. There are (2) blue/yellow wires that provide power to relays. We're ignoring those. The blue/yellow wire we're looking at is between the a/c button and the fan switch. It's the ground for the a/c switch, run through the fan speed controller as an AND gate. For a/c to activate, the button must be depressed AND the fan speed controller must not be in the off position.

And phil, yes, you will need a diode on this blue/yellow.
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Old 10-06-2009, 11:18 AM   #13
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****, I was wrong. If I'm reading the instructions right the diode is supposed to be on the blk/blue wire.
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Old 10-06-2009, 11:24 AM   #14
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The purpose of the diode is to prevent the blower motor from grounding through the a/c amp, so it wouldn't matter which wire you put it on.
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Old 10-06-2009, 11:26 AM   #15
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Quote:
Originally Posted by Ben View Post
The purpose of the diode is to prevent the blower motor from grounding through the a/c amp, so it wouldn't matter which wire you put it on.
So which wire should I ground?
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Old 10-06-2009, 11:28 AM   #16
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To test operation? Ground the black/blue.

BTW, I'm looking at the 99 schematic.
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Old 10-06-2009, 11:36 AM   #17
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A refers to the plug on the car-side of the harness.
B refers to the NB pigtail.

A-P1 -- AC3 & B-P4 (fan speed 1)
A-P2 -- B-P5 (fan speed 2)
A-P3 -- AC1
A-P4 -- diode* (inline) to AC2
A-P5 -- B-P3 My problem is here, there is no P3 on the plug that goes to the HVAC

A-S1 -- B-S2 (fan speed 3)
A-S2 -- B-S3 (fan speed 4)
A-S3 -- B-S1 (ground)

L1 -- B-P1
L2 -- B-P2
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Old 10-06-2009, 11:37 AM   #18
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Quote:
Originally Posted by Ben View Post
To test operation? Ground the black/blue.

BTW, I'm looking at the 99 schematic.

Even with the Diode on it? The dash and HVAC I have are from a 99.
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Old 10-06-2009, 11:45 AM   #19
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Quote:
Originally Posted by levnubhin View Post
A refers to the plug on the car-side of the harness.
B refers to the NB pigtail.

A-P1 -- AC3 & B-P4 (fan speed 1)
A-P2 -- B-P5 (fan speed 2)
A-P3 -- AC1
A-P4 -- diode* (inline) to AC2
A-P5 -- B-P3 My problem is here, there is no P3 on the plug that goes to the HVAC

A-S1 -- B-S2 (fan speed 3)
A-S2 -- B-S3 (fan speed 4)
A-S3 -- B-S1 (ground)

L1 -- B-P1
L2 -- B-P2
This is gibberish. Needs pictures.
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Old 10-06-2009, 11:51 AM   #20
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Quote:
Originally Posted by Ben View Post
This is gibberish. Needs pictures.
1st pic is the NA pig tail, second two plug into the NB HVAC. The 3 wire plug is the a/c button.

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Last edited by levnubhin; 10-06-2009 at 12:22 PM.
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