2001 Nissan Maxima - A/C Won't Turn On

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crownvic
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2001 Nissan Maxima - A/C Won't Turn On

Post by crownvic »

A/c will not turn on.

There is a green and black wire from the main switch to the computer; if i ground it the system will work. I replaced the main switch, still the same. All power and grounds seem to be good.
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Re: 2001 Nissan Maxima - A/C Won't Turn On

Post by ricmorin »

crownvic wrote:A/c will not turn on.

There is a green and black wire from the main switch to the computer; if i ground it the system will work. I replaced the main switch, still the same. All power and grounds seem to be good.
Is this a manual or auto AC? Also, what trim level Maxima?
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Re: 2001 Nissan Maxima - A/C Won't Turn On

Post by crownvic »

Its auto a/c.A 2001 maxima gle.I tested the pressure sensor,its ok.[computer!!! thats where my mind is]I think everything else is ok.Does the ground come from the amp,or the computer???
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Re: 2001 Nissan Maxima - A/C Won't Turn On

Post by ricmorin »

crownvic wrote:Its auto a/c.A 2001 maxima gle.I tested the pressure sensor,its ok.[computer!!! thats where my mind is]I think everything else is ok.Does the ground come from the amp,or the computer???
Well, since the control for the AC compressor comes from the ECM, my thought would be that the amp provides the ground that the ECM needs to see for compressor operation. I'd cut the wire and ground the ECM side just to be sure. Many of these systems use some for of ECM control to cut out AC for WOT.
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Re: 2001 Nissan Maxima - A/C Won't Turn On

Post by crownvic »

I replaced the amp which is the control head still the same problem.
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Re: 2001 Nissan Maxima - A/C Won't Turn On

Post by ricmorin »

crownvic wrote:I replaced the amp which is the control head still the same problem.
Bummer. Do you have the correct powers and grounds to the amplifier? Did you try cutting that wire and confirming that control?
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Re: 2001 Nissan Maxima - A/C Won't Turn On

Post by brianp87 »

If powers, grounds and amp are good then it is computer
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Re: 2001 Nissan Maxima - A/C Won't Turn On

Post by crownvic »

I cut the wire n grounded it to the computer,the system turned on.I just also just found out the new amp was from a salavage yard.Could it really be that amp is bad with the same problem?????WOW THIS HAS MY MIND!?:!?:!?:
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Re: 2001 Nissan Maxima - A/C Won't Turn On

Post by steven kiser »

is there a power steerig cut off switch?
never argue with a fool, they'll drag you down to their level and beat you with experience
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Re: 2001 Nissan Maxima - A/C Won't Turn On

Post by ricmorin »

crownvic wrote:I cut the wire n grounded it to the computer,the system turned on.I just also just found out the new amp was from a salavage yard.Could it really be that amp is bad with the same problem?????WOW THIS HAS MY MIND!?:!?:!?:
Good. Now it's reasonable to conclude that the ECM and all on that side is functioning properly. At this point I would make certain that all powers and grounds are good at the amp. It's very possible the used amp has the same problem.
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Re: 2001 Nissan Maxima - A/C Won't Turn On

Post by brianp87 »

ricmorin wrote:
crownvic wrote:I cut the wire n grounded it to the computer,the system turned on.I just also just found out the new amp was from a salavage yard.Could it really be that amp is bad with the same problem?????WOW THIS HAS MY MIND!?:!?:!?:
Good. Now it's reasonable to conclude that the ECM and all on that side is functioning properly. At this point I would make certain that all powers and grounds are good at the amp. It's very possible the used amp has the same problem.
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Re: 2001 Nissan Maxima - A/C Won't Turn On

Post by crownvic »

WOW!! i replaced the amp with a new one still the same problem,i am very confused????
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Re: 2001 Nissan Maxima - A/C Won't Turn On

Post by ricmorin »

crownvic wrote:WOW!! i replaced the amp with a new one still the same problem,i am very confused????
Looking at the diagram, there is a thermal sensor on the top left of the engine. Not sure what it does, but it may limit compressor engagement if it senses an overheat condition. Check that out. It looks to be the only input to the amp that could prevent engagement.
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Re: 2001 Nissan Maxima - A/C Won't Turn On

Post by ricmorin »

Also found pinout values for your Grn/Blk wire. Without call for compressor there should be 4.6 volts on that wire. When the amplifier calls for compressor engagement, that voltage should go to zero. If it doesn't, and all powers and grounds are good, and you're sure the setting will call for engagement, there may be an input to that amplifier that is preventing engagement.
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Re: 2001 Nissan Maxima - A/C Won't Turn On

Post by crownvic »

I still cannot find this problem ive been testing wires for two days now im lost.
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Re: 2001 Nissan Maxima - A/C Won't Turn On

Post by crownvic »

I found it WOW i found out the car was wrecked in the front.the ambient sensor was missing .Thank you for all your help.god bless
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Re: 2001 Nissan Maxima - A/C Won't Turn On

Post by steven kiser »

charge for your time. santa comes in december............................................
never argue with a fool, they'll drag you down to their level and beat you with experience
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