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SAAB 9000 Aero Electricals – Door locks, Radio Noise, ACC Memory, Turn Signal/Hazards ...
My recently purchased 97 Saab 9000 Aero (137K) has now developed some vexing electrical problems: the ACC did not retain memory and started "off"; the central door locks worked intermittently - and rarely; the right radio speaker started picking up what sounded like turbo whine; the right turn signal flashed fast a couple of times (bad bulb symptom?), then quit completely, then a day later spontaneously came back completely restored; the hazards don’t flash at all. All this in a span of about 10 days.
Fuses checked out OK.
I dropped the fuse/relay panel, reseated all the relays and the speaker noise is gone. Central locks and ACC memory returned – for a while. In fact, the turn signals also came back fully restored after one repositioning of the assembly. Two minutes later – after another repositioning – the turn signals were gone again.
I’ve reliably isolated the central door locks problem to a bad ground: when I alligator clipped the fuse/relay panel mounting tab to ground the central door locks work fine and crisply.
Pulled the flasher relay and looked inside: no burns, scorch marks or bad solder joints. Checked the pins on the relay socket and there’s no voltage change when the turn signal level is activated – for either a right or left turn. Also looks like a previous owner had some problems down there as well: a wire to the turn signal/hazard relay has been repaired.
So, a couple of questions:
1) Is the central door lock circuit designed to get its ground from the metal-to-metal connection of the fuse/relay panel to the frame?
2) Any clues on what to try next? Although, logically, the turn signal lever on the steering wheel stalk is the next step, the intermittentcy of the phenomenon upon repositioning the panel assembly leads me to think I’ve got a wire short and/or ground problem (the fuses for the central lock (#16), radio, clock, SCC (#19) and the hazard warning lights (#22) are adjacent on the top row of the fuse panel).
Anyone out there run into similar problems – or have a suggested solution?
Puzzled ...
posted by 67.21.8...
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