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

crownvic · Post by **crownvic** » Mon Jun 29, 2009 8:48 am

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.

ricmorin · Post by **ricmorin** » Mon Jun 29, 2009 9:41 am

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?

crownvic · Post by **crownvic** » Mon Jun 29, 2009 10:43 am

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???

ricmorin · Post by **ricmorin** » Mon Jun 29, 2009 10:52 am

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.

crownvic · Post by **crownvic** » Mon Jun 29, 2009 1:01 pm

I replaced the amp which is the control head still the same problem.

ricmorin · Post by **ricmorin** » Mon Jun 29, 2009 1:12 pm

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?

brianp87 · Post by **brianp87** » Mon Jun 29, 2009 3:41 pm

If powers, grounds and amp are good then it is computer

crownvic · Post by **crownvic** » Mon Jun 29, 2009 4:04 pm

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!?:!?:!?:

steven kiser · Post by **steven kiser** » Tue Jun 30, 2009 2:36 am

is there a power steerig cut off switch?

ricmorin · Post by **ricmorin** » Tue Jun 30, 2009 3:23 am

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.

brianp87 · Post by **brianp87** » Tue Jun 30, 2009 6:26 am

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.

crownvic · Post by **crownvic** » Tue Jun 30, 2009 9:47 am

WOW!! i replaced the amp with a new one still the same problem,i am very confused????

ricmorin · Post by **ricmorin** » Tue Jun 30, 2009 9:55 am

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.

ricmorin · Post by **ricmorin** » Tue Jun 30, 2009 10:07 am

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.

crownvic · Post by **crownvic** » Mon Jul 06, 2009 11:55 am

I still cannot find this problem ive been testing wires for two days now im lost.

crownvic · Post by **crownvic** » Mon Jul 06, 2009 1:32 pm

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

steven kiser · Post by **steven kiser** » Mon Jul 06, 2009 1:44 pm

charge for your time. santa comes in december............................................

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

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

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