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#16
11-10-2010, 07:52 PM
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Re: 2004 Impala dim odometer
The odometer and radio display circuit, during the day, when the exterior lights are off, is tied together only to the BCM class 2 for ( non variable ) dimming but not to the headlight/dimmer for dimming purposes. When the exterior lights are on, 12 volts is then supplied to the headlight dimmer allowing it to vary dimming up to or below the reduced illumination set by the BCM class 2 circuit to those two circuits. So yes they are "tied" together when the exterior lights are on. However, they are not tied together when the lights are off which is when you describe to have the dim radio display and odometer.
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#18
11-10-2010, 08:12 PM
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Re: 2004 Impala dim odometer
So, how about this... it makes sense the radio and the instrument cluster would be on seperate circuits when the lights are off because the radio and odometer are at full brightness, but the instrument cluster's lights are off because they are needles. But when the lights are on, then they are all one circuit because when you dim it, everything dims the same. But if my theory is right, then the circuit that the radio is on is the same one as the odometer. So, maybe replacing the dimmer/headlight switch would fix it... Because those are the two things that are abnormally too dim during the day. Before I put this post in, I was starting to think I have my dimmer turned way brighter at night just to see it.
One thing I have been thinking too... you mentioned in an earlier post if my rear lights are dimmer... I have been thinking my head lights have been dimmer lately. Not sure if that's my imagination too.
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#19
11-10-2010, 08:25 PM
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Re: 2004 Impala dim odometer
Your BCM should not be dimming your radio and odometer when the exterior lights are off. They should both be at full brilliance. A scan of the BCM for Body codes would be the next logical step.
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#20
11-10-2010, 08:35 PM
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Re: 2004 Impala dim odometer
In reply to your theory, the radio display illumination and the odometer is not connected to the dimmer switch when the exterior lights are off. You can replace the dimmer but it wil not cause you to have dimming of these items when the exterior lights are off as is the problem you originally described
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#21
11-10-2010, 08:42 PM
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Re: 2004 Impala dim odometer
About the BCM codes though... if the BCM was going to tell me anything, wouldn't the check engine light have to be on? It's not on and hasn't been on for years. So, doesn't that mean, at least to the car, there's nothing wrong? Is there anything the scanner can tell about why it's too dim if the check light isn't on?
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