ACC Climate control going bad? - SaabCentral Forums
*
Home Saab Pictures Saab Classifieds Saab Dealer Listings Saab Forum Saab Forum


Go Back   SaabCentral Forums > Saab 9000 > 9000 Workshop

9000 Workshop 9000 (1985-1998) Technical Forum

SaabCentral.com is the premier Saab Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools Display Modes
  #1  
Old 3rd February 2011
7aull 7aull is offline
Junior Member
 
Join Date: Apr 2006                                                
Location: alaska
My Saabs: 86 9000 turbo
Posts: 12
Default ACC Climate control going bad?

Cheers All-
did not see an Archive area to check so forgive if this has been covered elsewhere.

86 9000T US model, 123,000mi

My ACC panel lit up like a christmas tree the other day - button indicators all (or most) illuminated inspite NOT being selected. Temp readout digital display distorted. Buttons still seemed to function, but with no follow-thru with lights to confirm operation. Magically it was fine today, but I know it will be back...

Solutions? I expect even if the panel WAS still available, it would be Heroically expensive. So. Used? IS it the panel? or some buried relay(s) somewhere?
What model year range of panels will replace it? I know that later 9000 panels LOOK the same, but part number differences seem to suggest otherwise.

And any guidance on the mechanics of exchanging them?

Thoughts, suggestions, references to archives on this problem appreciated!

regards
Stu Aull
86 9000T
Alaska
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 9th February 2011
7aull 7aull is offline
Junior Member
 
Join Date: Apr 2006                                                
Location: alaska
My Saabs: 86 9000 turbo
Posts: 12
Default

bump-

really?
no one EVER had/seen this problem??

Stu Aull
Alaska
Reply With Quote Quick reply to this message
  #3  
Old 9th February 2011
c900's Avatar
c900 c900 is offline
Saab Lunatic
 
Join Date: Jul 2005                                                
Location: Tronno, NSW, .au
My Saabs: 81 8V 900T, 91 2.1 900i, 90 9k 2.0 Carly
Posts: 3,032
Default

Could be a faulty electrical connection somewhere. Have you pulled out the ACC unit and made sure the electrical harness connection at the back is ok with no obvious broken wires or connector pins not properly seated in the housings?

Have you chekced the ACC fuse is properly seated in it's socket?

It could be a dry joint on a PCB inside the ACC unit itself though I haven't had a need to do any sort of board-level repair in my 9k's ACC unit to date.

Craig.
__________________
Craig Dewick - Tronno, NSW, .au - Flickr - 1981 8V 900T, 1990 9k 2.0 Carlsson, 1992 2.1 900i - RIP Moose.Parts and their top-quality customer service!
Reply With Quote Quick reply to this message
  #4  
Old 9th February 2011
7aull 7aull is offline
Junior Member
 
Join Date: Apr 2006                                                
Location: alaska
My Saabs: 86 9000 turbo
Posts: 12
Default

Thanks Craig-
if you'll forgive apparent laziness on my part, I have done NOTHING yet since I didn't want to crack open the dash or ACC until someone could maybe offer more specifics.

Excellent and obvious idea of course -
does the 85-90 ACC units "just" snap out from the front or does the dash top need to come off or....
????
hate to bugger it just trying to pull it free!
thoughts?

Stu in Alaska
Reply With Quote Quick reply to this message
  #5  
Old 10th February 2011
Superaero Superaero is offline
Saab Lunatic
 
Join Date: May 2005                                                
Location: Calgary, Alberta, Canada
My Saabs: 1997 Aero manual
Posts: 3,100
Default

Never heard of a failure of this component. I agree likely a loose cable connector. Do the self test and report the displayed codes. Ignition ON. select AUTO and VENT simultaneously and allow the self test to complete. If the ACC has failed it should display that code, otherwise you will see a number from 0 (no faults ) to likely 1 or 2 (if any faults). Select VENT sequentially for the number you see and record and post to us the code displayed after each press of VENT. If 0 displayed then pressing VENT should restart the ACC.
Reply With Quote Quick reply to this message
  #6  
Old 10th February 2011
chengny's Avatar
chengny chengny is offline
Saab Lunatic
 
Join Date: May 2006                                                
Location: New Hampshire
My Saabs: 96 9K CSE, 97 9K CS, 96 9K CS, 94 9K CSE
Posts: 1,178
Default

I'm not sure what the 1986 version of the ACC controller looks like so this may not be of any help. But it may be a workaround using a newer (more readily available) unit :




*** FOR ADDITIONAL INFORMATION NOT INCLUDED HERE, REFER TO TSB #01950537, DATED AUGUST, 1995 *** .


  • From 1993 a new ACC control module is introduced in order to eliminate erroneous diagnostic trouble codes being generated from the rear A/C. This applies to all cars of year models M199O-M1993 with ACC2. The new control module has the following designation:
  • ACC control module M1994 part number 43 82 933
  • or as a spare parts kit for rear A/C: Part number 74 96 326 (contains ACC control module as above).
  • If this control module is to be fitted in cars from M199O-93 any jumper connections and resistors in the wiring harness must be removed.
Action
  1. Unplug the 39 pin and the 12 pin connector on the rear side of the ACC control module.
  2. Remove any jumper connections between pin 30 and pin 32 on the 39 pin connector. Insulate cable.
  3. Remove any resistor between cables 23 (black) in the 12 pin connector and cable 407 (yellow/white) in the 39 pin connector. Insulate the cable.
  4. Fit the new ACC control module and calibrate.
Anyway, having offered that probably useless bit of info, I would suggest checking for proper continuity to ground. The ACC panel uses ground point G-8 (under the drivers side speaker). Poor grounding of electronics often manifests itself in the kind of weird ways you described.

BTW: Saab acknowledges that this component is extremely intolerant of static charges. They even go so far as to recommend the use of a hand ground strap (as used in computer repair) during R&R.

Last edited by chengny; 10th February 2011 at 09:29 PM.
Reply With Quote Quick reply to this message
  #7  
Old 11th February 2011
7aull 7aull is offline
Junior Member
 
Join Date: Apr 2006                                                
Location: alaska
My Saabs: 86 9000 turbo
Posts: 12
Default

you guys are GREAT - thank you!
You're right, the Post 1990 ACC info is likely no use (but thanks) -
will attempt diagnostic and post results.

Just assumed these units were eventually problematic since I saw DOZENS offered up on ebay...

Was always afraid this early electric/electronic system might have been a bit ambitious even for Saab. but - it HAS been 25 yrs!

Stu Aull
Alaska
Reply With Quote Quick reply to this message
  #8  
Old 11th February 2011
Superaero Superaero is offline
Saab Lunatic
 
Join Date: May 2005                                                
Location: Calgary, Alberta, Canada
My Saabs: 1997 Aero manual
Posts: 3,100
Default

Many of these electrical components are so reliable they outlast the cars they were fitted to.

Those of us who own Alfa Romeos joke that there are plenty of spare engines and transmissions around to be fitted to the few non rusty bodies left. Same principle.

People worry alot about the modern electronics going bad in their cars thus obsoleting them. In reality the automated quality control required to manufacture these puppies pretty much guarantees that failure will occur shortly after original installation. if it doesn't fail during the warranty it probably will long outlast the car. That is why so many spares of these components are available. However, NEVER buy one of these electronic units from anyone who won't absolutely guarantee they are working. this is another reason they are hard to re-sell so there are lots available. The ONLY way you can test many of these units is to fit them and drive them. In many cases the car manufacturer cannot test these units and must return them to the original manufacturer who can test them. Generally speaking the repair mode for solid state devices is the garbage can.....
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the SaabCentral Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale: Climate Control (ACC Control Unit) brettbutler25 Parts for Sale/Wanted - North America 1 24th April 2012 12:21 PM
Auto A/C climate control to Manual control? SpongeBob NG900 & OG9-3 Workshop 5 21st November 2009 11:49 AM
help with climate control veedubbin 9-5 Workshop 13 19th May 2006 10:08 AM
Auto Climate Control - Vent control problem desmoboy NG900 & OG9-3 Workshop 3 11th March 2006 06:55 PM
Air Con to Climate Control Iestyn Davies 9000 Workshop 1 22nd March 2005 05:31 PM


All times are GMT -4. The time now is 05:17 PM.



Powered by vBulletin® Copyright ©2000 - 2014, vBulletin Solutions, Inc.

top of page | sitemap | email us



copyright © 2003 - 2011 saabcentral.com, All rights reserved http://www.whiter.co.uk - valid xhtml - valid css
SaabCentral is an independently run website and is not affiliated in any way to Saab Automobile AB.


Garage Plus vBulletin Plugins by Drive Thru Online, Inc.