S-Type A/C Climate control system blower comes on after ignition is turned off....

Hey everyone
So I purchased a 2004 S-Type V6 3.0 without the climate control working I took out the C/C module to find two burnt tracts and repaired them with copper wire.
I also replaced the heater control valve behind the radiator..
Anyway the climate control works really well nice and cold so problem solved right?!
only problem now is after I take out the key after a few seconds you can hear the vents move to de-mist and the blower for the heater and A/C starts up.
regardless of what I do e.g. turn off A/C before ignition turns off the fan just kicks in. I replaced the relay. I’ve even left the relay out to stop the battery from draining overnight. With the relay out you can still hear something click behind the dash and what ever it is this is still draining the battery.
I have power to two sides of the 70amp relay in the boot constantly..
if I remove the C/C Module no air but battery doesn't die
anyone have any tangible ideas?
thanks

 

Um, have you seen this?:

https://jaguarclimatecontrol.com/new...t-to-see-this/



The $64,000 question: Was the car doing this before the module repair? If this is a new problem, it sounds like a bad module, even with the repair. If it was doing this previously, then it sounds like the control module is not shutting off properly. Look here, at figure 06.1:

http://www.jagrepair.com/images/Auto...x2062004en.pdf


The control module has two sources of power, off to the left of the diagram. One source is controlled by the ignition switch. The other source is constant battery power.

See the 40 II inside a circle? That leads you back to the ignition switch, in figure 01.5. If the ignition switch isn't properly shutting off power, the module will think the key is still in the run position. Note how the power goes through fuse F14, in the primary junction box. This is a small fuse panel just outboard of the front US passenger's feet, in the door hinge area. Remove F14 and see if the control module now shuts off properly. If so, the ignition switch is bad and was letting power through even when turned off. Please note this is not very likely, as this same part of the switch also powers up many other circuits, basically everything else on that same page. You can further test this by checking for voltage at this fuse. Make sure power goes away when the key is turned off.

Power may be normal there, but the control module also gets constant battery power via fuse F20 in the primary junction box. (This feeds the 88 inside a square at figure 06.1) So if the voltage at fuse F14 switches on/off normally with the key, remove F20. If the doors and blower now shut off, the module was bad.



Which relay is that? R7? Which contacts have power? 1 and 3? If so, that is normal. These two sockets always have battery power, via fuse F10 in the rear power distribution box. IIRC, the contact numbers are only printed on the relay, not the socket. You may have to get the numbers from the relay and then figure out which socket is which.

 

Thanks kr98664 for your amazing response

I will go through everything you have suggested and let you know how I go on

All the best stay safe in the current health crisis

 

a couple quick questions....when the blower comes back on, had you been using auto setting on climate control..... apprx how much time elapses from the time the blower kicks back on and you get it shut off

 

Hi
Yeah so its a combination of using the "Auto" button and the "Climate" touch screen. After key removal the vents activate in less than a minute I would say definitely less than a couple of minutes.. I can't actually shut it off without removing the relay and also fuses. Once the minute has lapsed you first hear the vents activate/move and then the blower starts up on a lower setting and stays on.

When I pull the key I the car makes a noise by the steering wheel for the adjustments and likewise when I put the key back in.

 

Hmm, I just remembered something that could explain it. V8 models have an auxiliary coolant pump for improved heater output at idle, among other reasons. After engine shutdown, there was a feature that lets this pump and blower fan run for a few minutes for extra heat before getting out of the car.

Does this sound familiar? No such feature on my '02 V6. I'd have to research it a little more. I'm not even sure where the control logic is handled. But if it originates in the HVAC controller, does the module have to be programmed for the engine type? Since this car already had some recent HVAC problems, perhaps the PO's "fix" was to replace the controller, but it came from a V8 car. If I'm on the right track, that might explain some of the equation.

 

my line of thinking also Karl...there is also a feature when using auto climate that will turn the blower on to dry the evaporator after the car is turned off....auto climate always uses some degree of a/c...my car is set up with this feature...when it comes on, it will run the blower from 30 seconds to about 3 minutes...the way to test this is let it run and time it...if it continues for more than 3 minutes then there is a problem...the feature i speak of is accessed using sdd/ids and is on or off....if the replacement module had it enabled, then that could be the issue.... if the feature is behaving normally, then you could just leave it alone...that is why I asked the questions I did in my previous post because it sounds like the feature is enabled

 

Thanks Both Karl and Scott.

Sounds like you guys are on a similar path..

So this sounds like this could be the case with the evaporator? Do you know how to turn this off? the problem with this is the blower just stays on if I remove the relay in the boot the blower doesn't have power but something is running in the background and still draining the battery overnight.

I have had the C/C Module out now for a couple of days and no battery drain!?

I am thinking if this feature of the blower staying on is programable I might be able to drop the time down

The point to remember here is I don't know if this is the correct module for the vehicle as the pervious owner had little or no info to give me. 612CF are the last digits of the unit I currently have but I figured if I got one out of a later model they may have fixed any issues?

Thanks
Adam

 

I hope I haven't misquoted name apologies if I have I am on the old phone.

 

I have this activated as well but in mine it takes a good 10 minutes to start blowing after the ignition ius turned off. it doesnt happen immediately. and it takes a while to begin. i never would have known it happens except it sits in my shop and I sit out there too. but normally folks walk away within that time period

 

No worries. You got my name correct. That's all that really matters, right?

Alas, you've reached the limits of my meager knowledge on the subject of this overachieving HVAC system. Hopefully somebody more knowledgeable about programming options will chime in.

 

I'll keep you updated to the progress.. Thanks for all your amazing help you are a real awesome dude

its very kind of you to help

 

I forgot about the delay factor as aarcuda states....if the blower remains on immediately after turning the car off, then the drying evaporator feature is not the issue....it comes on after a few minutes of the car being off

 

Hi everyone

so I’m a bit concerned about the climate control module repair I did - given its copper wire..

I am looking at getting another control module but the second hand units seem to be for a later model, does anyone know if I can use a later model climate control module so long as it has the same features like Colour Nav touch screen?

thanks

I just want to say a big thanks to everyone who as thrown ideas into the ring on here - I’m away from the jag atm but soon as I get back I’ll check it all out
Thanks

 

I think you can. I have a spare thats from a different year that I used to troubleshoot. And I believe it worked after playing with the settings in sdd

 

• thanks for the info I’ll see if it works I have found a resistor missing on the current board so I might replace that if I can first see if it changes anything

 

Hi
So I came across this today - Looks like something is missing - Does anyone have a close up photo of these two resistors? R30 and R37 of the S-Type climate control module or even a schematic?

 

Quite the find! Hard to tell from the picture, but does it look like resistors overheated and melted the solder, causing them to fall off? If so, are they part of the same path where the two traces had burned?

Did you find the resistors loose in the housing? Unless they fell out of some cooling holes, they'd still be in there.

If no indication of overheating, and nowhere for the wayward resistors to escape, there's another possibility. Sometimes production changes are made to the circuitry within a module, such as deleting a component (or two) on a circuit board. But rather than incur the expense to redesign the board, the components are simply left off during assembly. I've noticed this many times, with blank spots still labeled for nonexistent pieces.

 

This actually looks like thee was one there before as there are ridges one thief side of the contact point.. the other one looks like it’s been re-soldered in place🤷‍♂️
no sign of any resistors in the box

 

Land rover, any follow up on this.
I have returned to my v8r a few times and the blower motor is running. As I understand from above it's a feature of the v8 ?
How long do the fans run for as I'm currently chasing a battery drain.