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Re: Automatic Brightness Issue
The automatic brightness feature is useless to me because of two reasons.
First, it is too dark to start with.
Second, it does not respond as fast as I like to see.
I end up using only two default settings- Battery or AC mode.
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DLR module ???? DRL - daytime running lamps , doesn't have a DRL module. Why do you want to know that ? I see it coming , your going too replace it to see if it fixes the problem your having with the light's ? Without testing the circuit's . Do yourself a favor an take it to a qualified repair shop , before you make thing's worse .
Daytime Running Lamps (DRL)
The ambient light sensor is a light sensitive transistor that varies its signal to the body control module (BCM) in response to changes in the outside ambient light level. Any function or condition that turns ON the headlamps will cancel daytime running lamp (DRL) operation. With the headlamp switch in the OFF position, activating automatic lamp control (ALC), the front turn signal lamps will be turned ON after a 30-second delay under daylight conditions, which is determined by the ambient light sensor signal to the BCM. The DRL operates when the ignition switch is in the RUN position, the front wipers are not activated, and the transmission is not in PARK. When these conditions have been met and the ambient light sensor indicates daylight conditions, the BCM will illuminate the front turn signal lamps ON steady.
The body control module (BCM) monitors the daytime running lamps (DRL) ambient light sensor signal circuit in order to determine if the DRL or the headlamps should be turned ON in the automatic lamp control (ALC) mode. When the BCM senses the ambient light sensor voltage is between 1-4.9 volts, either the DRL or the headlamps will be commanded ON.
DTC B2645 Ambient Light Sensor Circuit
The one that flashes indicates that the car's security system is functioning properly (not necessarily that it is locked, though). The one that doesn't light is a sensor for ambient lighting conditions. It is used to turn on/off automatic headlights, or to adjust interior lighting for appropriate light levels, depending on how the manufacturer has it set up.
Daytime Running Lamps (DRL)
The ambient light sensor is used to monitor outside lighting conditions. The ambient light sensor provides a voltage signal that will vary between 0.2 and 4.9 volts depending on outside lighting conditions. The body control module (BCM) provides a 5-volt reference signal to the ambient light sensor. The ambient light sensor is permanently grounded at ground G202. The body control module (BCM) monitors the ambient light sensor signal circuit to determine if outside lighting conditions are correct for either daytime running lights (DRL) or automatic lamp control (ALC) when the headlamp switch is in the AUTO position. In daylight conditions the BCM will command the low beam headlamps ON at reduced intensityy. Any function or condition that turns on the headlamps will cancel DRL operation.
There could be a DTC stored in the BCM pointing to a problem !
DTC B2645 Ambient Light Circuit
Turn the headlamp switch to the OFF position.
Do the low and high beam headlamps remain OFF?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
Go to Step 3
Remove the appropriate low or high relay.
Do the lamps turn OFF?
Go to Step 5
Go to Step 4
Press the Fn + Left arrow key on laptop keyboard to disable Ambient Light Sensor to see if that will resolve the issue. Follow the steps in article http://dell.to/13f7ugH to adjust the brightness manually.
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Is your phone a smart phone?? Does it have something called ambient light sensor (light sensor).??? Check your phone manual. If that is the case then you can turn it off. Ambient light sensor is a function that senses the light outside and automatically adjust the brightness of the screen. But sometimes it goofes up. So you can go to settings> display settings> brightness> if it is auto then turn it to manual as per your convenience. Again depending on your phone model the settings may vary. I hope this helps.
If your keyboard doesn't have a brightness control button (mine is F6), open System Preferences and click on the Displays control panel. Move the brightness slider to the right to increase brightness. If you don't want the computer to automatically adjust brightness uncheck the box next to Automatically adjust brightness as ambient light changes.
Not sure if this is your issue, but when the brightness is on full with AC plugged in, the ambient light sensor isn't as sensitive. Unplugged, it is. The ambient light sensor judges the light in the room and responses by automatically adjusting the brightness. What you could be seeing is your shift in movement blocks/allows more light to the sensor (the camera at teh top) and thus adjusting your brightness. To disable system preferences> display> uncheck "automatically adjust brightness.
Also, it may be the LCD, If you are in warranty, bring it to your local Apple store for repair.
If I could be of further assistance, let me know. If this helps or solves the issue, please rate it. Thanks, Joe
Have you tried adjusting the Brightness of the Display? May seem like a stupid thing to ask, but some laptops come with what is known as Ambient Light Sensors and by setting a higher brightness level it Disables the Ambient Light Sensor kicking in.