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Electrical Diagnosis
Posted by Derek S. Brown (more from Derek S. Brown) on Fri, 8 Nov 2002 20:25:42
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

1994 900S V6, has run great for 126,000mi.  Some recent electrical 
trouble, however.

First sign of problems was the SRS light came on right after a morning 
start.  Dealer DX indicated 'code 1133 light shorted to ground.'  I was 
told there was nothing to do, so they reset it.

It was fine for another 250 miles, then the same thing happened again 
right after morning start.  Same SRS code comes up.  Dealer calls Saab 
tech support who diagnoses it immediately (we thought), saying to replace 
the ingition switch.  (They ask if we saw any other lights flash or 
erratic gauge behavior.  I recall yes, but it had been so brief that I 
didn't concern myself with it, just the SRS light since this remained.)

Dealer replaces ignition switch, resets SRS, and car does OK on their 
test drive.  After I pick it up I get less than a mile away before I get 
erratic gauge behavior.  The gauges go flat and the odo is dark.  Gauges 
come back after a couple seconds, stay on for a little while, then go 
flat/dark again.  This happens about 5-6 times during 5-8 mins or so.  
Most times it's really quick, but one time the gauges were flat/dark for 
15-20 seconds.

During the erratic behavior I notice that the Fuel and Info Display 
lights remain on for a couple seconds after the blips.  The others gauges 
did not light.  Finally, when things smoothed out after a few minutes, 
the SRS light came back on again.

The dealer is going to check it out again and talk to Saab, but I would 
like to know if anyone has any tips.  Could the ignition switch that they 
replace it with be bad?  (It was a new part.)  I have more info below 
that may be tangentially helpful.

Thanks, Derek Brown
1994 900S V6 auto 126,000mi 

Notes: 
-Each time it was morning.  Temp ranged from 45-60 degrees
-Behavior occured with both the radio on and off
-Behavior was much more erratic and worse afer ignition replaced, but it 
 did smooth out after a few mins
-The only electrical work I've done on it was to replace the radio about 
 850miles ago with a salvage unit.  Also replaced SID bulbs.  Things ran 
 OK after this.  Radio was dead after I did a head gasket overhaul about 
 1500miles ago.  We don't know why it went dead after the head gasket.  No 
 good explanation except that the battery was disconnected during the 
 job.  Clarion had no good explanation.  No other electrical trouble.
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