Climate control lights staying on.
Thread Starter
Racer
Joined: Jun 2009
Posts: 331
Likes: 0
From: Columbia South Carolina
Climate control lights staying on.
I just bought my first Vette it's a 01 Coupe.
I parked the car locked it and the lights on the climate control are staying on.
Is this normal?
I parked the car locked it and the lights on the climate control are staying on.
Is this normal?
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
No, that is not normal. Do they go off after time?
Pull your DIC codes and see if you have anything to post. I would think nothing will show up.
There is a reason, We can figure it out. Very strange.
Pull your DIC codes and see if you have anything to post. I would think nothing will show up.
There is a reason, We can figure it out. Very strange.
Thread Starter
Racer
Joined: Jun 2009
Posts: 331
Likes: 0
From: Columbia South Carolina
I saw it last night when I went to lock it up went back later it was still on. This morning it was too bright to tell.
It's not the whole display that lights up just the buttons on the bottom.
I have a p0650 that is the only code that is electrical.
My check engine light does not come on even when cranking I think either the bulb burned out or the previous owner disabled it somehow.
It's not the whole display that lights up just the buttons on the bottom.
I have a p0650 that is the only code that is electrical.
My check engine light does not come on even when cranking I think either the bulb burned out or the previous owner disabled it somehow.
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
Not sure what the code is but it is not in the HVAC section. Can look later.
My FSM shows 2 power sources. Pull fuse 27 and then 18 and let me if one or both makes the lights go off (hopefully). These fuses are in the passenger side fuse block/box.
My FSM shows 2 power sources. Pull fuse 27 and then 18 and let me if one or both makes the lights go off (hopefully). These fuses are in the passenger side fuse block/box.
Thread Starter
Racer
Joined: Jun 2009
Posts: 331
Likes: 0
From: Columbia South Carolina
When I pulled fuse 27 All the lights to the AC turned off I reinstalled it. Then removed fuse 18 The HVAC lights stayed on like it always does.
Also after doing this my front tire pressure is not showing up.
Also around the ecu there is a bundle of 3 wires orange yellow and black these are cut and have electrical tape on them.
Also after doing this my front tire pressure is not showing up.
Also around the ecu there is a bundle of 3 wires orange yellow and black these are cut and have electrical tape on them.
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
Not home but will see later what feeds Fuse 27. Sounds like something is retaining power on the circuit when it should not.
We can work on the tire pressure issue a little later. Not sure how that would be related to fuse 27 but need to look at the circuits involved.
As I understand, GM provided those wires for owner installed accessories. Black is ground. The other 2 are 12V power. One is always powered, the other is not when the car is turned off. Not sure which is which, but can find out if you want that info for future reference.
We can work on the tire pressure issue a little later. Not sure how that would be related to fuse 27 but need to look at the circuits involved.
As I understand, GM provided those wires for owner installed accessories. Black is ground. The other 2 are 12V power. One is always powered, the other is not when the car is turned off. Not sure which is which, but can find out if you want that info for future reference.
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Thread Starter
Racer
Joined: Jun 2009
Posts: 331
Likes: 0
From: Columbia South Carolina
Not home but will see later what feeds Fuse 27. Sounds like something is retaining power on the circuit when it should not.
We can work on the tire pressure issue a little later. Not sure how that would be related to fuse 27 but need to look at the circuits involved.
As I understand, GM provided those wires for owner installed accessories. Black is ground. The other 2 are 12V power. One is always powered, the other is not when the car is turned off. Not sure which is which, but can find out if you want that info for future reference.
We can work on the tire pressure issue a little later. Not sure how that would be related to fuse 27 but need to look at the circuits involved.
As I understand, GM provided those wires for owner installed accessories. Black is ground. The other 2 are 12V power. One is always powered, the other is not when the car is turned off. Not sure which is which, but can find out if you want that info for future reference.
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
Looked at the FSM. Fuse 27 has power under all conditions. Hate to say it, but seems like you have an internal problem with the HVAC control unit. This is not a normal issue like the LED display. At this point I can only suggest you replace it. I have done internet searches and cannot find another case of this. You could try contacting people who fix the dispays and see if they can resolve. Without the internal design info I have no idea what is the problem. Maybe someone else will comment on this thread and help.
If you decide to replace I can provide you guidance on console removal. Been there, done that for the LED fix.Not difficult to do in a few minutes.
If you decide to replace I can provide you guidance on console removal. Been there, done that for the LED fix.Not difficult to do in a few minutes.
Last edited by dadaroo; Apr 25, 2013 at 08:05 PM.
Thread Starter
Racer
Joined: Jun 2009
Posts: 331
Likes: 0
From: Columbia South Carolina
Race Director
Joined: Jan 2008
Posts: 16,028
Likes: 170
From: oregon
if you have any suspicion of the hvac you can remove the hvac control and operate the car
takes about 15 minutes to remove it as there are something like 4 nuts and 3 screws you have to remove to get at it
if your problem goes away you may be on to something. if it does not then you don't need another hvac controller
takes about 15 minutes to remove it as there are something like 4 nuts and 3 screws you have to remove to get at it
if your problem goes away you may be on to something. if it does not then you don't need another hvac controller
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
Just to be sure, I looked into the Lighting System section schematics. The HVAC unit does not show up. Double checked in the specfic schematics on self dimming and it does not show up. Next, I looked in the Electrical section at the I/P fuse block diagram and it also said fuse 27 is Hot At All Times (just like the HVAC section said).
I am always open to other ideas, but it sure looks like your HVAC unit has an issue. I can't explain it any other way based on the Factory Manual schematics. There are some new ones out there and a whole lot of used ones. I doubt anyone has the info to fix, but you could ask some vendors who do the HVAC light and LED fixes. Let me know how it goes and if you have any other questions.
I am always open to other ideas, but it sure looks like your HVAC unit has an issue. I can't explain it any other way based on the Factory Manual schematics. There are some new ones out there and a whole lot of used ones. I doubt anyone has the info to fix, but you could ask some vendors who do the HVAC light and LED fixes. Let me know how it goes and if you have any other questions.
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
mikeyrko, I just realized we both live in the SAME TOWN! Let's get together for a beer or whatever soon. I had already PM'd you with my phone number. Like I said, I have done the HVAC unit removal so I would be glad to help you. Could also be a good time to put in an iPOD interface with the radio if you have any interest. I prefer that to the 12 CD unit in the rear. Give me a call and PM me with your phone number.
Race Director
Joined: Apr 2007
Posts: 11,150
Likes: 890
From: South Western Ontario
There is a yellow wire on pin C16 of the HVAC module that is labelled "instrument panel lamp supply voltage 3". It comes from the BCM on the green connector pin B2. It appears the BCM has a relay internally and it switches 12V onto this wire. Possibly, this turns the lighting on or off.
There are 2 other pins from the BCM called instrument panel lamp supply voltage 1 and 2 and one runs the shift light and the other runs a shift lock control solenoid. So it's also possible the above wire has nothing to do with the lighting of the HVAC unit and just happens to be labelled that for whatever reason.
My guess would be that the dimming is controlled over the serial bus, possibly the cluster sending a signal to the different modules to adjust their light level. A transistor or some IC that controls the light brightness might have failed in the HVAC control module.
There are 2 other pins from the BCM called instrument panel lamp supply voltage 1 and 2 and one runs the shift light and the other runs a shift lock control solenoid. So it's also possible the above wire has nothing to do with the lighting of the HVAC unit and just happens to be labelled that for whatever reason.
My guess would be that the dimming is controlled over the serial bus, possibly the cluster sending a signal to the different modules to adjust their light level. A transistor or some IC that controls the light brightness might have failed in the HVAC control module.
Melting Slicks
Joined: Aug 2003
Posts: 2,786
Likes: 7
From: Iowa
do any other lights stay on with them? I have what I'd call odd behavior with those lights as well, they stay on for a long time, like 20-30 minutes after I turn the car off. but not just the HVAC, all the interior lights do this. they always turn off, every time, but they stay on a very very long time.
another thing i noticed, when they do turn off its not all at once. the interior lights all turn off except for the door control panels, those stay on a few minutes longer than the rest of the lights. I always thought that was weird, but as far as I know its always done that, and like I said they always turn off, i've never had a dead battery the next morning.
another thing i noticed, when they do turn off its not all at once. the interior lights all turn off except for the door control panels, those stay on a few minutes longer than the rest of the lights. I always thought that was weird, but as far as I know its always done that, and like I said they always turn off, i've never had a dead battery the next morning.
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
Lionelhutz: Thanks, my oversight to not also check the connector to validate against what the other schematics said. The lights go off when he pulls fuse 27. Somehow that power and the BCM input work together. Go figure? My guess is Fuse 27 is the primary source and the BCM/ Serial Bus simply interupts that supply somehow like you suggested. At least I'm glad we don't have to figure that out to fix his problem (I hope).
My bet is on the HVAC module and not the BCM or Serial Bus. At least it would be a cheaper fix. He lives near me and I have a new in the box HVAC unit we can try. That should help us determine if the HVAC module is the cause or not.
My bet is on the HVAC module and not the BCM or Serial Bus. At least it would be a cheaper fix. He lives near me and I have a new in the box HVAC unit we can try. That should help us determine if the HVAC module is the cause or not.
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
Well, to close the loop on this, we got together this morning and installed one of my HVAC units. It solved the issue so all he needs to do is get a replacement.
PS: He started the engine and it is a monster sounding one with LG headers. Looking forward to a ride when I go over to put the replacement unit in. I think I will bring my helmet.
PS: He started the engine and it is a monster sounding one with LG headers. Looking forward to a ride when I go over to put the replacement unit in. I think I will bring my helmet.
Thread Starter
Racer
Joined: Jun 2009
Posts: 331
Likes: 0
From: Columbia South Carolina
Well, to close the loop on this, we got together this morning and installed one of my HVAC units. It solved the issue so all he needs to do is get a replacement.
PS: He started the engine and it is a monster sounding one with LG headers. Looking forward to a ride when I go over to put the replacement unit in. I think I will bring my helmet.
PS: He started the engine and it is a monster sounding one with LG headers. Looking forward to a ride when I go over to put the replacement unit in. I think I will bring my helmet.
(Especially Fellow corvette owners)
Make sure to bring your helmet I have a firesuit you can use also.