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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 __________________ Best Car Insurance | Auto Protection Today | FREE Trade-In Quote |
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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The a/c switch completes a ground. Add a ground jumper and see what happens.
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Originally Posted by Ben
(Post 464091)
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. __________________ Best Car Insurance | Auto Protection Today | FREE Trade-In Quote |
Hablas espanol?
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http://neomiata.com/garage/1999_Miat...20Diagrams.pdf
page 2. nothing goes directly to gnd. they are all interlocked. |
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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Originally Posted by y8s
(Post 464097)
http://neomiata.com/garage/1999_Miat...20Diagrams.pdf
page 2. nothing goes directly to gnd. they are all interlocked. |
Originally Posted by Ben
(Post 464171)
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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Originally Posted by Ben
(Post 464171)
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.
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? |
Originally Posted by levnubhin
(Post 464196)
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. |
Originally Posted by y8s
(Post 464206)
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? And phil, yes, you will need a diode on this blue/yellow. |
Shit, 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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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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Originally Posted by Ben
(Post 464227)
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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To test operation? Ground the black/blue.
BTW, I'm looking at the 99 schematic. |
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 __________________ Best Car Insurance | Auto Protection Today | FREE Trade-In Quote |
Originally Posted by Ben
(Post 464230)
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. __________________ Best Car Insurance | Auto Protection Today | FREE Trade-In Quote |
Originally Posted by levnubhin
(Post 464233)
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 |
3 Attachment(s)
Originally Posted by Ben
(Post 464237)
This is gibberish. Needs pictures.
Attachment 203354 Attachment 203355 Attachment 203356 __________________ Best Car Insurance | Auto Protection Today | FREE Trade-In Quote |
1 Attachment(s)
Attachment 203353
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http://img390.imageshack.us/img390/7439/93acsystem.jpg
http://img205.imageshack.us/img205/1456/99acsystem.jpg http://img196.imageshack.us/img196/4492/acsytems.jpg http://img209.imageshack.us/img209/5383/acstuff.jpg Bottom diagram depicts a 99 climate control connector, and how it must be wired to a 93 dash harness. 99 position 1 to 93 position 4 and so on. I didn't finish the dash illumination system, since you said yours works, and it's on a different page of the workshop manual. |
Originally Posted by Ben
(Post 464289)
Bottom diagram depicts a 99 climate control connector, and how it must be wired to a 93 dash harness. 99 position 1 to 93 position 4 and so on. I didn't finish the dash illumination system, since you said yours works, and it's on a different page of the workshop manual. Do you mean 1 to 3? __________________ Best Car Insurance | Auto Protection Today | FREE Trade-In Quote |
On the large connector,
99 position 1 is fan speed 2 93 position 4 is fan speed 2 On the small NB specific 3 pin connector, position 1 NB goes to position 3 on the NA large connector. That's +V to illuminate the a/c on indicator. I assume the R/B and G/W 2 position connector you have pictured is the NA dash illumination harness. |
Ok, I think I understand and If I do then I have it all wired correctly. I think all I need to do is ground the NB3 wire which is blue/yellow?
And where should the diode go? And in case I'm reading this wrong NB2 and NB3 both go to position 2 __________________ Best Car Insurance | Auto Protection Today | FREE Trade-In Quote |
If you ground NB3, then the a/c comp can run with the fan off.
Suggest you continue to study the diagram http://img209.imageshack.us/img209/5383/acstuff.jpg |
Just so I'm not mixed up I labeled the pins....
Pin 1 on the HVAC side goes to Pin 4 on the NA harness Pin 2 on the HVAC side goes to Pin 5 on the NA harness Pin 3 on the HVAC side is empty Pin 4 and 5 go to the lights Pin 6 on the HVAC side goes to Pin 7 on the NA harness Pin 7 on the HVAC side goes to Pin 8 on the NA harness Pin 8 on the HVAC side goes to Pin 6 on the NA harness NB1 goes to Pin 3 on the NA harness NB2 goes to Pin 2 with a diode on the NA harness NB3 goes to Pin 5 on the NA harness __________________ Best Car Insurance | Auto Protection Today | FREE Trade-In Quote |
It probably works either way, but I think putting the diode on NB3 is a better idea, after actually looking at the diagrams.
That's why I put it there on my pinout. |
Originally Posted by Ben
(Post 464361)
It probably works either way, but I think putting the diode on NB3 is a better idea, after actually looking at the diagrams.
That's why I put it there on my pinout. __________________ Best Car Insurance | Auto Protection Today | FREE Trade-In Quote |
Does not compute.
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NB3 goes to Pin 5 on the NA harness
Pin 2 on the HVAC side goes to Pin 5 on the NA harness Both go to Pin 5 on the NA pig tail __________________ Best Car Insurance | Auto Protection Today | FREE Trade-In Quote |
Got ya. You want the diode in line on the jumper between NA5 (main harness) and NB3 (a/c switch harness). You do not want the diode in the fan speed circuit.
Run the jumper from the NA harness 5 to NB3. Cut that wire, then put a diode in it. Note that the diode is directional. The banded end goes away from the a/c button. |
Originally Posted by Ben
(Post 464372)
Got ya. You want the diode in line on the jumper between NA5 (main harness) and NB3 (a/c switch harness). You do not want the diode in the fan speed circuit.
Run the jumper from the NA harness 5 to NB3. Cut that wire, then put a diode in it. Note that the diode is directional. The banded end goes away from the a/c button. Thanks again man. __________________ Best Car Insurance | Auto Protection Today | FREE Trade-In Quote |
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