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Heads Up display error

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Old Apr 6, 2008 | 07:06 PM
  #1  
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Default Heads Up display error

My heads-up display displays .11 g's on level ground and not moving.

Is there a way to reset the 'G' reading? I did not find the answer in the big shop manual. All it says is replace the sensor.

If I understand this correctly, the active handling system need to read the correct lateral G force in order to work correctly.

Anybody experience this problem?
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Old Apr 7, 2008 | 08:34 AM
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Are you sure its not just the record of the highest achieved G-force that the system automatically records from your last drive?
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Old Apr 7, 2008 | 07:21 PM
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I don't think its that. Sitting still, it says .11 g's. While moving, it goes up in a normal manner and goes down as far as zero is gentle curves. But on flat, level ground while not moving, it reads .11 g's.

My concern is the active handling system uses the lateral g's as part of its correction calculation of yaw rate so if the g measurement is wrong, the active handling system won't make the correct correction.

The big GM service manual simply says to check the sensor voltage and if out of spec, replace it. I tried disconnecting the battery in a blind attempt to reset, but it did not work. I was wondering if anyone else had a similar experience.
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Old Apr 7, 2008 | 07:41 PM
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Sounds like a bad sensor! Have you tested it like the service manual states?
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Old Apr 7, 2008 | 08:39 PM
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Someone had a similar problem several months ago - sorry, but I don't remember who or what the solution was. Hopefully they'll see this thread and chime in.
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Old Apr 20, 2009 | 10:29 PM
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Default Heads Up display error

I had the same problem with my car today. Did you find out what the problem was?
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Old Apr 21, 2009 | 12:35 AM
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I would pull the battery cable just to eliminate a possible easy fix.
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Old Apr 21, 2009 | 08:20 AM
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The initial poster disconnected the battery power with no success.
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Old Apr 21, 2009 | 09:30 AM
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Active handling doesn't use the g-meter. It uses a combination of sensors like yaw sensors, steering wheel position sensors, wheel speed sensors, wheel directional sensors, etc to make the decision of what to do.

I would just reset the g-meter and see what happens.
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Old Apr 21, 2009 | 11:52 AM
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Where is the sensor located? I'm hoping the HUD is picking up the information from a sensor mounted remotely. Would hate to have to replace the HUD (pull the whoile dash apart).
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Old Apr 21, 2009 | 04:34 PM
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Originally Posted by 08vycpe
Active handling doesn't use the g-meter. It uses a combination of sensors like yaw sensors, steering wheel position sensors, wheel speed sensors, wheel directional sensors, etc to make the decision of what to do.
Actually, it does use the g-meter sensor according to the technical description. The sensor is located behind the HVAC Controls. It's delivers the yaw rate and lateral acceleration as analog voltage. If you have a voltmeter, check the reference voltage (5V), ground and the sensor output which should be 2.5V (2.3-2.7V) when the vehicle is not moving. Or a check with the Tech2 if possible. The sensor itself could be faulty or it's a connection issue at the connector.
The fault is not within the HUD, it just displays the value from the EBCM where the senor is connected to.
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Old Apr 21, 2009 | 04:56 PM
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After a few days, it fixed itself. My theory, the system needs time to learn zero G's.
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Old Apr 21, 2009 | 06:56 PM
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Thanks Mez. I'll give it a little time. I've got a trip scheduled this week-end and I'll see what happens.
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Old Apr 26, 2009 | 08:29 PM
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Just got back from our road trip. Z06 ran great, got great gas mileage coming back (29.1 -I think the wind helped), and g-meter corrected itself. Had a great time and trip.
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