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Old 10-01-2010, 04:37 PM   #1
zee750s
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Exclamation speedometer and all gauges not working!

ok im tearing my hair out. i have replaced the bcm pcm and the starter switch. i also cleaned all the grounds on the interior. and tore apart the old switch and cleaned that and cleaned the lock cylinder as well. but i still have no gauges it came on once when i bought it now not at all. the check engine light is on but no mileage speed gas or temp working. please help i cant afford to spend to much on this car and love doing things myself.
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Old 10-01-2010, 05:36 PM   #2
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Default Re: speedometer and all gauges not working!

The instrument cluster on your Malibu gets the speedometer, tachometer, and CEL from the PCM on separate circuits and the rest from the BCM over the serial data interface. I hope you didn't just throw the PCM and BCM together without reprogramming.
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Old 10-01-2010, 05:50 PM   #3
zee750s
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Default Re: speedometer and all gauges not working!

i just plugged in the new ones and it didnt turn on the gauges so i put the old back in. nothing about reprogamming tho. do i just disconnect battery and relearn key to do this if so i did.
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Old 10-01-2010, 07:07 PM   #4
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Default Re: speedometer and all gauges not working!

You need to take it to a shop that has a scan tool to do the programming. I'm not quite sure what's been done and why and thus there isn't much I can suggest.
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Old 10-01-2010, 07:35 PM   #5
zee750s
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Default Re: speedometer and all gauges not working!

everything is back to the original parts. just tried the others in hopes that it would work. but didn't so I put out back the way it was.except for the ignition switch.can any scan toollike the one at autozone reprogram this. do I even need to since its all back to original parts? where are the ground locations at by the way . might have missed some.
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Old 10-01-2010, 08:18 PM   #6
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Default Re: speedometer and all gauges not working!

If you put the original PCM and BCM back, there's no need to program. And, the kind of scan tools you need are professional ones costing thousands. See the instrument cluster diagram at http://cid-54465800aad91b49.office.l...b/va103205.pdf. Maybe you can follow the wires to the ground splice points.
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Old 10-04-2010, 05:26 PM   #7
zee750s
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Default Re: speedometer and all gauges not working!

Quote:
Originally Posted by Starship View Post
If you put the original PCM and BCM back, there's no need to program. And, the kind of scan tools you need are professional ones costing thousands. See the instrument cluster diagram at http://cid-54465800aad91b49.office.l...b/va103205.pdf. Maybe you can follow the wires to the ground splice points.


well thanks but i checked all grounds cleaned them up,and still no gauges.
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Old 10-04-2010, 05:52 PM   #8
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Default Re: speedometer and all gauges not working!

When you turn the key ON, does everything initially look okay (lamps self-test, gauges sweep, etc.)?
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Old 10-04-2010, 06:23 PM   #9
zee750s
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Default Re: speedometer and all gauges not working!

nope it just has the check engine light and the seat belt light on.
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Old 10-04-2010, 07:33 PM   #10
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Default Re: speedometer and all gauges not working!

Starship, does his car have a 5V (or other voltage) regulator for the dash? All of my older cars did. It was a supply for the gauges only, not the lights. Do his gauges get the positive voltage, then go through the gauges, then to a modulated ground? Or does the ground come straight in, thru the gauges, then to modulated positive?

Knowing this could help eliminate sources of concern.
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