Re: Central Locking Fix -- Next Step? - Saab 900 Bulletin Board - Saabnet.com
The banner above is an advertisment - if it asks you to download software, please ignore.
Site News -
3/26 M Car Covers (by State of Nine) |
12/12 Make Amazon Pay Saabnet!
[General |
Members |
C900 |
9000 |
NG900 & OG93 |
93 |
95 |
NG95 |
99 |
Sonett |
Vintage Models |
Clubs |
Other Cars |
FAQs |
Gifts |
Member Photo Galleries |
Member Directory |
Classifieds |
Manuals |
*Buddy Registry |
*Mileage Registry |
Polls |
What's New |
Raffle |
Photo of the Month |
Sponsors]
[Main C900 Bulletin Board | BBFAQ |
Prev by Date | Next by Date | Post Followup ]
Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Re: Central Locking Fix -- Next Step?
Posted by S Carlson [Email] (more from S Carlson) on Sat, 15 Dec 2018 14:42:10
In Reply to: Central Locking Fix -- Next Step?, BAS900, Thu, 13 Dec 2018 18:02:45
Members do not see ads below this line. - Help Keep This Site Online - Signup
Does your central locking ECU have lots of little round black transistors, or just a chip and a few resistors and capacitors? The one with the chip is a later style and I think it's more robust or at least easier to deal with. I have successfully resurrected one of these, and this is my story.
My '91 900 (later style central locking ECU) had intermittently functional central locking even after the re-solder. It turned out there were bad capacitors inside. It contains two capacitors: a small ceramic capacitor that was only marked "n15" which according to the internet means it's a 150 picofarad unit, and a bigger electrolytic capacitor clearly marked 100uf 35v.
Mine would click (relays would twitch) sometimes when I flexed the circuit board with my hands or bumped it. I only had a 122pf capacitor lying around. I put it in. These are not polarity-sensitive so can be soldered in either direction. Bingo, now the thing worked. Some of the time. It wouldn't randomly twitch anymore with flexion of the board, but it would still fail to lock and unlock after sitting for a minute.
I decided it could be that the electrolytic capacitor (located near the chip) was self-discharging with time. I replaced this capacitor with a higher-rated unit (all I had) that was 100uF, 100v. Stripe (negative lead, shorter pin on a new unit) faces toward the end of the board, not the end with the plug. It has been working great for six months now!
posted by 65.112.10...
Posts in this Thread:
- Central Locking Fix -- Next Step?, BAS900, Thu, 13 Dec 2018 18:02:45
- Re: Central Locking Fix -- Next Step?, S Carlson, Sat, 15 Dec 2018 14:42:10 <-- Viewing This Message
- Re: Central Locking Fix -- Next Step?, Justin VanAbrahams , Fri, 14 Dec 2018 07:43:07
- Re: Central Locking Fix -- Next Step?, Rvsil, Fri, 14 Dec 2018 06:24:43
- mine doesn't do that either..., Ken , Thu, 13 Dec 2018 20:18:58
Members do not see ads below this line. - Help Keep This Site Online - Signup
Post a Followup
No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.
StateOfNine.com
|
SaabClub.com
|
Jak Stoll Performance
|
M Car Covers
|
Ad Available
|
Random Saabnet.com Member Gallery Photos (Click Image)
This is a moderated bulletin board - Posting is a privilege, not a right.
Unsolicited commercial postings are not allowed (no spam). Please, no For Sale or Wanted postings, SERIOUSLY.
Classifieds are to be listed in The Saab Network Classifieds pages.
This is a problem solving forum for over 250,000 Saab owners, so expect to see
problems discussed here even though our cars are generally very reliable. This is not an anything goes
type of forum. Saabnet.com has been a moderated forum since 1988. For usage guidelines, see the
Saabnet.com Mission and Purpose Page. Please remember that you are
not anonymous. Site Contact | Site Donations | Other Sites by SP -
Poverty2Prosperity.org | Run Club Menlo Park | ScreenBot
Site Members do not see red text instructions, bottom of the page anchor ads, or box ads.
Click here to see all
the Site Membership Benefits!