1993 Chevy Lumina Code 56 QDM-B failure

RED640

MEMBER
1993 CHEVROLET LUMINA

Computer problem
1993 Chevy Lumina 6 cyl Front Wheel Drive Automatic

Vehicle is Lumina APV (van) w/3800 engine. When started and engine is running AC will not power up, fan is not running either. Anti-lock light is on, Check Engine light is on. Pwr windows will not operate. Turning ignition off then back on after short wait will reset everything and then all will function. This has happened twice. After restarting vehicle ran fine except once as stated below.

There was one occurance where, while driving along after starting at another location, AC shut off (fan included) & windows did not function. I did not observe whether the 'anti-lock' light was on. Engine did not respond as per normal, sluggish. Again, I pulled to the side of the road, shut ignition off and waited for a count of 5 then restarted engine. Everything functioned again. It ran fine for about 1 hr. While returning home. I started the engine again the following day when the first stated sympton recurred.

I have checked numerous electrical plugs and have not found anything so far. Auto Zone & Advance Auto cannot give info for the vintage of this vehicle and the dealer is of no help unless I bring it in (surprise)

6 Replies

DOCFIXIT

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18,828 POSTS

Check fuse #16 pull out replace see if that cures problem

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Monday, July 20th, 2009 AT 3:41 PM

RED640

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There is nothing that refers to a fuse #16. I need a more descriptive identity of the fuse you are speaking of. Pls identify more (amp, fuse block location, or possibly a circuit identity)

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Tuesday, July 21st, 2009 AT 9:00 PM

DOCFIXIT

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Behind glove box 15 amp #16 labled IGN

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Wednesday, July 22nd, 2009 AT 2:31 PM

RED640

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Late yesterday I tried your remedy of removing the 15 amp IGN fuse and replacing it with a new one. After doing that I started the vehicle and it failed to start correctly. After shutting down and restarting it ran fine. This morning I started it and it started correctly. After going to a couple places of business I had no problems until starting it after about the 4th or 5th stop. It again failed. I also noted that the performance was terrible, no acceleration at all. I wouldn't hesitate to say that it couldn't get out of its own way. After shutting down, counting to 5 and then restarting, it ran fine. I had no more problems with it at the next 3 stops.

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Friday, July 24th, 2009 AT 3:34 PM

DOCFIXIT

MECHANIC
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Find ALDL black terminal should be near steering collumn. It has two rows of terms. The top row last two terms. Jumper paper clip will do. Turn key on do not start. Check engine light will flash these are trouble codes. Flash pause flash flash = 12. Post back codes

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Sunday, July 26th, 2009 AT 12:32 PM

RED640

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After further investigation I found a site at my neighborhood library that had schematics for a 1994 Lumina APV. After printing it and following the symptoms which I had, I determined that the ignition switch (electrical) on top of the steering column behind the covers and under the dash was defective. The contacts which supplied the electricity to the window circuits and the AC had burned and the holding material for the contacts (bakelite?Sp) had burned and allowed the contact to lay at an angle thereby not making contact reliably for that circuit. Replacing of the switch resolved ALL problems. I had no idea that there were problems associated with the window motor speed and the blower motor speed being caused by burned contacts in this switch. The Haynes booklet I have never even eluded to the existance of this switch nor were there ANY schematics that showed it's existance.

Thanks to my library technical online data I was able to resolve the problem. Additionally, It is NOT necessary to remove the steering wheel nor any other item from the top end of the steering column. Dropping the steering column is the only thing necessary and then ensuring that the switch is adjusted correctly to allow removal of the key and also enough movement to engage the starter circuit. These were addressed by documentation supplied with the replacement switch.

Thanks for trying--hope this helps you guys too.

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Monday, August 3rd, 2009 AT 7:40 PM