A8 Parts Forum  

Go Back   A8 Parts Forum > A8 D3 > D3 - Interior Electrics

D3 - Interior Electrics Airbags, Sensors, climate modules, instrument clusters, switches etc

Reply
 
Thread Tools Display Modes
  #1  
Old 23rd August 2019, 05:24 PM
mannyo mannyo is offline
Senior Member
 
Join Date: Jan 2012
Location: Blandford, Dorset
Posts: 1,974
Default D3 heater/ac fan problem

So, i guess as a result of lack of use my D3 heater blower has sort of stopped working.

Because the blower motor runs perfectly fine when being powered by the solar sunroof, I don't think its the motor itself.

So today I installed a replacement fan controller in the blower motor housing, and the result is still the same. Runs fine when left in the sun and engine off.

However today was really sunny and I discovered the fan is actually running with the engine on, but it's stuck in solar mode. Switching the system off and the fan still runs, disabling the solar sunroof running makes no difference and the fan continues to run.

So the blower fan is stuck in solar mode by the looks of it, is there a switching relay like on the D2?

I did having it running properly for a couple of days a few weeks back and it did work briefly this evening until I turned the climate control off and the blower would not switch back on when I turned it back on.

Manual fan speed adjustments make no difference, neither does setting Lo or Hi.
__________________
Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles

Last edited by mannyo; 23rd August 2019 at 05:28 PM.
Reply With Quote
  #2  
Old 23rd August 2019, 05:38 PM
HPsauce HPsauce is offline
Senior Member
 
Join Date: Sep 2011
Location: Chilterns, almost over HS2!
Posts: 7,703
Default

On a D2 switchover to the solar panel driving the fan is controlled by the HVAC system; I can't recall if there's an external relay or the solar panel is just wired straight into the HVAC and it's switched inside.
(I ought to recall, I've messed with it and it is VERY simple)
I wanted my D2 solar panel to be disabled with a switch and in the end I did that by cutting it's "earth" circuit and looping it out to a switch I installed. If there had been an accessible relay I would have done something to that.
(Awaits more informed opinions...… )
As for a D3 who knows?
__________________
2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation". (A much rarer model than a D2 S8 by the way!)
Finally: gone, but not forgotten.....
1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course. (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
Reply With Quote
  #3  
Old 23rd August 2019, 06:58 PM
mannyo mannyo is offline
Senior Member
 
Join Date: Jan 2012
Location: Blandford, Dorset
Posts: 1,974
Default

I found a current flow document on here, it details J355 as the solar operation control unit and appears to reside inside the car headlining.

Also found mention of J126 where the supply from the roof appears to plug into. It is J126 which I have replaced (I think) this in turn is connected to the climate module.

It is worth noting that I replaced the part with a used one from a newer car.

Really stumped now, I'll have no job in 5 weeks and I have this car which is eating money I cannot afford to lose.
__________________
Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
Reply With Quote
  #4  
Old 24th August 2019, 10:47 AM
mannyo mannyo is offline
Senior Member
 
Join Date: Jan 2012
Location: Blandford, Dorset
Posts: 1,974
Default

I've hooked up VCDS and have this code regardless of which controller (old or new) is installed.

I did clear the codes, and it comes back with the other usual ones I have.

Worth pointing out the fan did run earlier with no problem.

01844 - Control Module for Fresh Air Blower (J126)
008 - Implausible Signal
Freeze Frame:
Fault Status: 01101000
Fault Priority: 3
Fault Frequency: 1
Reset counter: 91
Mileage: 271398 km
Time Indication: 0
Date: 2003.02.27
Time: 00:10:42

Freeze Frame:
Temperature: 23.0∞C
Speed: 0.0 km/h
(no units): 8.0
(no units): 169.0

Research suggests in the blower motor despite the fact it runs fine on solar, any thoughts.

I'll reassemble the car tomorrow with the original controller, and I'll have to sell it with faulty blower, i've had it with this car now. I cannot afford to fix it.
__________________
Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles

Last edited by mannyo; 24th August 2019 at 10:50 AM.
Reply With Quote
  #5  
Old 24th August 2019, 10:53 AM
HPsauce HPsauce is offline
Senior Member
 
Join Date: Sep 2011
Location: Chilterns, almost over HS2!
Posts: 7,703
Default

Chances are that on solar it's a fairly direct connection to the fan, with no speed control.
In normal use it will be powered via a speed controller, so it suggests the fault is in that system "somewhere".
__________________
2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation". (A much rarer model than a D2 S8 by the way!)
Finally: gone, but not forgotten.....
1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course. (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
Reply With Quote
  #6  
Old 24th August 2019, 11:07 AM
mannyo mannyo is offline
Senior Member
 
Join Date: Jan 2012
Location: Blandford, Dorset
Posts: 1,974
Default

I've checked all the connections, and put a multimeter measuring volts and everything appears correct entering and exiting the controller. I've got ground, 12V coming in, I can see 4 volts coming into the same controller from the sunroof, its just weird and i've lost all patience and run out of money.
__________________
Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
Reply With Quote
  #7  
Old 24th August 2019, 11:38 AM
mannyo mannyo is offline
Senior Member
 
Join Date: Jan 2012
Location: Blandford, Dorset
Posts: 1,974
Default

here is a video I just shot, as you can see the blower works normally in solar mode.

https://youtu.be/CTd5gmO3vyg

There are no fault codes against the motor, just the control module.
__________________
Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles

Last edited by mannyo; 24th August 2019 at 11:52 AM.
Reply With Quote
  #8  
Old 24th August 2019, 11:47 AM
mannyo mannyo is offline
Senior Member
 
Join Date: Jan 2012
Location: Blandford, Dorset
Posts: 1,974
Default

Just a thought does anyone have a J126 controller knocking around, that I can borrow. You never know but the used one I got could also be faulty.

I'll then buy it off you, if it works or return it.

Part number is 4E0820521
__________________
Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
Reply With Quote
  #9  
Old 26th August 2019, 09:56 AM
mannyo mannyo is offline
Senior Member
 
Join Date: Jan 2012
Location: Blandford, Dorset
Posts: 1,974
Default

Still battling on with this, took interior apart and checked connections behind climate module and all is good.

Tried swapping old and replacement J126, still the same.

I had a look at measuring blocks and things look wrong here.

Address 08: Auto HVAC (4E0 910 043 )

10:29:02 Group 044: Fresh air blower V2
0.000 A Current actual
0 h Solar usage
0.00 V Voltage actual
5.80 V Voltage specified

The voltage specified goes up and down with the fan speed selection, but actual remains zero.

Switch engine off and solar kicks in and fan starts, and will then stay on solar even with engine restarting although VCDS is reporting zero volts.
__________________
Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles

Last edited by mannyo; 26th August 2019 at 10:03 AM.
Reply With Quote
  #10  
Old 26th August 2019, 10:34 AM
mannyo mannyo is offline
Senior Member
 
Join Date: Jan 2012
Location: Blandford, Dorset
Posts: 1,974
Default

Unlike a lot of other threads, mentioning lack of fuse 44 my D3 has one. Should have checked first before rooting around under the passenger carpet to discover mine is not there like in this post. http://forum.a8parts.co.uk/showpost....46&postcount=6

Anyway fuse was good, so now I am going to check the ground connection. Interestingly I removed the drivers side sill trim to get access to the grounds and now the car will not start either, and the starter is on the same ground point.

Another observation, with fuse 44 removed, I get 12V on one side of the fuse, and the voltage from the solar roof feeding back on the other side.

Another observation, with fuse 44 removed, the solar function of the fan continues to work and the fan spins.
__________________
Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 08:10 PM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.