Re: Central Locking Fix -- Next Step? - Saab 900 Bulletin Board - Saabnet.com
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Re: Central Locking Fix -- Next Step?
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Posted by S Carlson [Email] (more from S Carlson) on Sat, 15 Dec 2018 14:42:10 Share Post by Email
In Reply to: Central Locking Fix -- Next Step?, BAS900, Thu, 13 Dec 2018 18:02:45
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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!


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