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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 11-21-2005, 01:00 PM   #51
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Originally Posted by nick *
Well I had a chance to check out what we have been tossing around and I found that if I start the car and let it sit for a minute or two the blinking goes away on its own, and if I turn off the engine and then restart the car the same results happen again.
The functionality of the ECC is working like it always had work.
The temp readings on the LCD is no higher or lower than it should be.
I did remove the probe and wiring, checked to make sure the connection was good and tight when I mated the wire to the probe.
I guess I am going to start driving it and see what happens.
The blinking going away is normal...the blinking occurs as an indicator that a fault code has been set...it goes away after a few minutes of the car being started. Again, if you have fixed the problem, there is no way to tell until after 50 consecutive "on" cycles or taking to someone with a tech scanner..if the blinking does not go away on it'* own after 50 consecutive "on" cycles....it is telling you that another fault has been detected or has reoccured...as long as you have heat, cold, and air is coming out of the right vents, my guess is that the blinking will go away entirely in a matter of time.
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Old 11-21-2005, 01:49 PM   #52

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Nick...one more suggestion. Don't pull the battery connection unless you have to before you find out if time and number of starts is the answer to this quandry.
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Old 02-27-2015, 10:51 AM   #53
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When the ACC temperature control display starts flashing, it is telling you that the system has a fault. You may be a little low on Freon, or you could have other problems. Use the procedure below, to see if you can retrieve the codes. After resetting the codes, the compressor should cycle on long enough to do a pressure test. If not, try disconnecting the battery negative cable for about 30 sec. That will clear any residual memory from the ACC & PCM.

This procedure will work on 1992 -1993 models with ACC, and may also work on 1988-1991 models. (And my work for later years as well).

The diagnostic mode also contains a data list mode and an override mode.

Be careful not to select modes 01 or 02, as these are different modes, and may cause problems.

If you suspect you are in the wrong mode, press OFF repeatedly until you exit to normal mode. If the temperature display flashes for 2 minutes when the ignition is turned to RUN, a trouble code is set.

1. Turn ignition to RUN. Press OFF and WARM (temperature up) buttons simultaneously. (Hold in buttons until flashing segment test begins).

2. Watch the segment test, then the trouble codes will be displayed.

3. Code Key:

00 - No codes

10 or 110 - Ambient Temp Sensor circuit open or shorted.

13 or 113 - In-Vehicle Temp Sensor circuit open or shorted.

15 or 115 - LH Solar Sensor circuit open or shorted.

35 or 135 - Data Line failure - HVAC Control Assembly

38 or 138 - Data Line failure - PCM

40 or 140 - Driver Air Mix Motor circuit open or shorted, or not calibrated

48 or 148 - Long Term Freon Loss

52 or 152 - Keep Alive Memory lost; sets with battery disconnected

66 or 166 - Low Freon

A number 1 prefix indicates a history trouble code!

4. Press OFF twice once the codes are displayed to end diagnostic mode, OR to clear trouble codes, press FAN DOWN three times (make sure 03 is displayed).

Once 03 is displayed, press FAN UP to clear trouble codes. Then repeatedly press OFF to end diagnostic mode.

Last edited by mellowde; 02-27-2015 at 10:53 AM.
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