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Old 06-23-2014, 10:53 AM   #1
OnMy4th
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Default AC light wont come on - 2007 Ion

my AC stopped working.
I Push the button in, NO LIGHT and compressor DOES NOT come on.
I Checked fuses, driver side and engine compartment, both good.
Plenty of 134a pressure on the low side valve.

I picked up a used HVAC board and the AC light still will NOT go on AND compressor still does not kick in. NO FIX.

What would be the next step?

...
2007 ION2 193k
2007 Sky Roadster 37k
2000 SC2 @ 244,000 miles R.I.P.
1995 SL2 sold it at 213,000 miles
1993 SL1 gone X-wife got it in the settlement

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Old 06-23-2014, 11:09 AM   #2
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Default Re: AC light wont come on - 2007 Ion

Is the blower fan on? Are both boards bad?

...
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Old 06-23-2014, 01:35 PM   #3
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Default Re: AC light wont come on - 2007 Ion

Blower fan/button lights works great and the recirculate does too.
I can't believe 2 boards are bad.

...
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2007 Sky Roadster 37k
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Old 06-23-2014, 04:21 PM   #4
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Default Re: AC light wont come on - 2007 Ion

Have you checked the A/C relay? You could try swapping it with another relay to see if it works.

The A/C light operation is independent of the A/C compressor. The light should turn on whenever the A/C button is pressed regardless of whether or not the A/C compressor actually turns on. If it doesn't light up, you most likely have a bad ground going to the HVAC control unit.

...
2007 Ion 2 Quad Coupe 5-speed manual 182K miles
2007 Chevy Equinox LT 194K miles
2018 Chrysler Pacifica Touring L 41K miles

Last edited by ruley73; 06-23-2014 at 04:27 PM..

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Old 06-23-2014, 06:47 PM   #5
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Default Re: AC light wont come on - 2007 Ion

If the relay is bad ( help me here, is that in the fuse area under the hood?)
will it keep the AC light from coming on?

...
2007 ION2 193k
2007 Sky Roadster 37k
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1995 SL2 sold it at 213,000 miles
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Old 06-23-2014, 08:08 PM   #6
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Default Re: AC light wont come on - 2007 Ion

No, it's the relay. Not the fuse.

...
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Old 06-23-2014, 08:22 PM   #7
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Default Re: AC light wont come on - 2007 Ion

The relay...Gray cube ......Isn't it almost next to the 10amp ac fuse?

If it is bad, will it keep the ac button from lighting up when pushed?

...
2007 ION2 193k
2007 Sky Roadster 37k
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Old 06-23-2014, 11:10 PM   #8
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Default Re: AC light wont come on - 2007 Ion

Yes, the gray cube. Not sure exactly where it is, but it's well labeled. Yes, if the circuit is not complete, the bulb can't light.

...
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2003 Chevrolet venture lt

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Old 06-23-2014, 11:10 PM   #9
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Default Re: AC light wont come on - 2007 Ion

While not expert on Ion a/c systems, wiring diagrams and general wiring concepts have changed how HVAC systems operate, separating the control head using low voltage (5v) logic level signals to communicate to the bcm and ecm to operate the (12v) a/c compressor. The drawings are not detailed enough to say switching on a/c is supposed to turn on the led light or directly control power to the compressor. The control head sends as a/c request signal to the bcm and the bcm relays this request to the ecm that commands the a/c relay to send power to the compressor clutch. Before the request signal is heeded, the pressure sensor must detect pressures within the a/c system, above 44 psi and below 428 psi before allowing the request to be forwarded to the ecm. If you sense some confusion here, its because of the complex low voltage software signaling used to control many functions, a feature used for many years to reduce heavy outdated relays and wiring to allow utilization of small circuits to control the same equipment. With replacement of the control head, this only eliminates the head unit, leaving wiring, fuses, relays, and the a/c system to troubleshoot. The best you can do is ensure no blown fuses.

One safety feature to protect the compressor is the often misunderstood low/high pressure sensor, strictly designed for the compressor, not the operator. It can be called the technical version of the mechanical fuse that protects against short circuits. As mentioned above, loss of refrigerant (a leak) that lowers pressures below 44 psi is detected and sends a disable signal to the ecm. The ecm disables compressor operation despite the HVAC control indicators. The controls do one thing but the bcm and ecm monitor sensor signals that must meet requirements before allowing the compressor to run. I do not know whether your pressure readings are well above 44 psi to allow compressor operation or if there are other issues not mentioned that prevents compressor operation. If this seems beyond comprehension, do not feel alone as this is advanced troubleshooting, above the average persons grasp of HVAC systems, requiring advanced knowledge in electrical, electronic and refrigeration. This isn't a simple remove and replace procedure.
Attached Images
File Type: jpg ac wrg 1.jpg (118.5 KB, 11 views)
File Type: jpg ac wrg 2.jpg (78.2 KB, 10 views)

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Old 06-23-2014, 11:25 PM   #10
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Default Re: AC light wont come on - 2007 Ion

Quote:
Originally Posted by OnMy4th View Post
The relay...Gray cube ......Isn't it almost next to the 10amp ac fuse?
Yes, it is the small rectangular relay just above it.

Quote:
Originally Posted by OnMy4th View Post
If it is bad, will it keep the ac button from lighting up when pushed?
Nope. Again, the A/C light comes on whenever the A/C button is in the ON position. If it doesn't light up, either the LED is bad, there is a bad ground connection going to the HVAC control unit, or the 7.5A HVAC fuse (interior fuse block) is blown.

On my car, the A/C light still illuminates when the A/C relay is removed.

I've attached the wiring diagram below.

HVAC_controls_wiring.pdf

...
2007 Ion 2 Quad Coupe 5-speed manual 182K miles
2007 Chevy Equinox LT 194K miles
2018 Chrysler Pacifica Touring L 41K miles

Last edited by ruley73; 06-23-2014 at 11:30 PM..

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Old 06-24-2014, 12:09 AM   #11
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Default Re: AC light wont come on - 2007 Ion

I stand corrected. Try buying a new board instead of a used one.

...
2007 Saturn Ion 2
2003 Chevrolet venture lt

trifecta dealer for the U.P. and WI. There is no two door ion. Proudly driving one of the last saturns produced before gm killed the brand.

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Old 06-24-2014, 05:50 PM   #12
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Default Re: AC light wont come on - 2007 Ion

UPDATE,
swapped relays with the horn, NO FIX

I removed the radio, pulled the control board and inspected the wiring to the control board connector. No contacts had pulled out or wires broken.

I'll check the 7.5a fuse again

Thanks for the wiring diagram,
YOU SAID "there is a bad ground connection going to the HVAC control unit"
How would I chase that one down?

...
2007 ION2 193k
2007 Sky Roadster 37k
2000 SC2 @ 244,000 miles R.I.P.
1995 SL2 sold it at 213,000 miles
1993 SL1 gone X-wife got it in the settlement

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Old 06-24-2014, 11:28 PM   #13
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Default Re: AC light wont come on - 2007 Ion

Quote:
Originally Posted by OnMy4th View Post
YOU SAID "there is a bad ground connection going to the HVAC control unit"
How would I chase that one down?
Use a multimeter to check for continuity of the ground wire in the harness for the HVAC control module.

...
2007 Ion 2 Quad Coupe 5-speed manual 182K miles
2007 Chevy Equinox LT 194K miles
2018 Chrysler Pacifica Touring L 41K miles

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Old 07-09-2014, 01:51 PM   #14
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Default Re: AC light wont come on - 2007 Ion

Just got the volt meter, sorry I am not electrical saavy.

To check ground continuity....is it The BLACK wire on the harness connector? (under the radio that the control board plugs into)

And put the red side of the volt meter on what?

I still have to plug in to see if any codes are being listed too....

...
2007 ION2 193k
2007 Sky Roadster 37k
2000 SC2 @ 244,000 miles R.I.P.
1995 SL2 sold it at 213,000 miles
1993 SL1 gone X-wife got it in the settlement

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Old 07-10-2014, 01:09 AM   #15
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Default Re: AC light wont come on - 2007 Ion

Quote:
Originally Posted by OnMy4th View Post
Just got the volt meter, sorry I am not electrical saavy.

To check ground continuity....is it The BLACK wire on the harness connector? (under the radio that the control board plugs into)

And put the red side of the volt meter on what?

I still have to plug in to see if any codes are being listed too....
Yes, it is the black wire. Hold the black test lead on the terminal for the black wire. Hold the red test lead on a good, clean metal grounding point. Ideally you want to see zero resistance.

...
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2007 Chevy Equinox LT 194K miles
2018 Chrysler Pacifica Touring L 41K miles

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Old 06-19-2015, 02:20 PM   #16
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Default Re: AC light wont come on - 2007 Ion

VERY OLD UPDATE, It got warm enough to do something about the AC not working so I paid the guy to troubleshoot the wiring. Come to find out the used HVAC control unit I put in last year was bad (JUST in the AC electronics on/off )

So weird though, it wouldn't work either with the old one and it worked fine before. (the reason I replaced it was that some lights were out)

I just ordered another used one $27.....here's to another roll of the dice.
($135 for brand new....yeeesh)

...
2007 ION2 193k
2007 Sky Roadster 37k
2000 SC2 @ 244,000 miles R.I.P.
1995 SL2 sold it at 213,000 miles
1993 SL1 gone X-wife got it in the settlement

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Old 06-24-2015, 02:26 PM   #17
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Default Re: AC light wont come on - 2007 Ion

So I replaced the control head AKA ACDELCO 15806918 AKA HVAC control assembly (just the PCB) and NO FIX !!!! DAAAAAAAM. Same Problem

Supposedly, this is a common fail point on this board??? (so my mechanic says)
He claims my compressor kicked on fine applying power at the connector when board was removed indicating a failed switch on the board. Cmon...three bad boards ALL with failed AC switches?

I hate to spend $143 buying a new assembly and still being in the same rut.

...
2007 ION2 193k
2007 Sky Roadster 37k
2000 SC2 @ 244,000 miles R.I.P.
1995 SL2 sold it at 213,000 miles
1993 SL1 gone X-wife got it in the settlement

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Old 06-24-2015, 07:35 PM   #18
2006 ion2
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Default Re: AC light wont come on - 2007 Ion

Quote:
Originally Posted by 2006 ion2 View Post
Try buying a new board instead of a used one.
This guy had the right idea. Used parts are always a gamble, new pays are guaranteed.

...
2007 Saturn Ion 2
2003 Chevrolet venture lt

trifecta dealer for the U.P. and WI. There is no two door ion. Proudly driving one of the last saturns produced before gm killed the brand.

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Old 06-24-2015, 09:18 PM   #19
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Default Re: AC light wont come on - 2007 Ion

Quote:
Originally Posted by OnMy4th View Post
So I replaced the control head AKA ACDELCO 15806918 AKA HVAC control assembly (just the PCB) and NO FIX !!!! DAAAAAAAM. Same Problem

Supposedly, this is a common fail point on this board??? (so my mechanic says)
He claims my compressor kicked on fine applying power at the connector when board was removed indicating a failed switch on the board. Cmon...three bad boards ALL with failed AC switches?

I hate to spend $143 buying a new assembly and still being in the same rut.
I agree that buying used electrical parts is always a gamble. However, the HVAC control board does not commonly fail so chances are very slim that you would get three bad parts in a row.

Does the A/C engage if you select the defrost mode? If so, then the A/C button is bad, but if not your problem is elsewhere.

Did you ever check the HVAC 7.5A fuse?
Did you check the ground connection?

According to the diagram I posted, the power that goes to the indicator LEDs for the A/C and recirculate buttons goes through the blower motor switch/knob but does not go through the logic CPU on the board. If either of the indicator LEDs work then the fuse is fine as well as the ground.

...
2007 Ion 2 Quad Coupe 5-speed manual 182K miles
2007 Chevy Equinox LT 194K miles
2018 Chrysler Pacifica Touring L 41K miles

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