DRL LIGHTS

[Bobby Kirk]

Hello Everyone, New to the site.Bought a 2016 sierra sle. my problem is drl lights don't seem to work when I have the light switch in auto.i can turn on park lights,drl comes on and works great,same when lights on all lights up.i may have a switch or button wrong just would light the drl to come on when I put in drive without park lights.any ideas? T hanks in advance.

[HeySkippyDog]

The "DRL" is just a string of LEDs. It isn't the main bulb.

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[Bobby Kirk]

^{Are the park lights and drl suppose to be tied together?drl come on when I turn on park lights.}

[JimCost2014]

31 minutes ago, Bobby Kirk said:

^{Are the park lights and drl suppose to be tied together?drl come on when I turn on park lights.}

Yes, they should "dim" while on with the park lights.

Bright when on by themselves, dim with the rest of the lights.

[Bobby Kirk]

^{Jim, That what I am saying.they don't come on when you put truck in gear.only way I can get them on is turn on park lights,or with all lights.}

[JimCost2014]

5 hours ago, Bobby Kirk said:

^{Jim, That what I am saying.they don't come on when you put truck in gear.only way I can get them on is turn on park lights,or with all lights.}

Got it, found this on the site, you may have a problem going on with your BCM:

Daytime Running Lamps (DRL) The daytime running lamps (DRL) will illuminate continuously when the following conditions are met:  
 The ignition is in the RUN or CRANK position  The shift lever is out of the PARK position for vehicles equipped with automatic transmissions or the parking brake is released for vehicles with manual transmissions   The low and high beam headlamps are OFF 
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 and the HVAC control module provides a low reference ground. The 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 designated DRLs ON. During low light conditions the BCM will command the low beam headlamps ON. Any function or condition that turns on the headlamps will cancel DRL operation.  
Automatic Lamp Control Place the turn signal/multifunction switch in the AUTO position for automatic lamp control. During automatic lamp control the headlamps will be off during daylight conditions but will turn on when the ambient light sensor detects low outside light level. The ambient light sensor is a light sensitive transistor that varies the voltage signal to the HVAC control module. The HVAC control module sends a signal to the body control module (BCM) via serial data commanding the BCM to apply ground to the headlamp low beam relay control circuit. This energizes the low beam relay, closing the switched side and applies battery voltage to the LEFT and RIGHT LOW BEAM fuses. Battery voltage is applied from the low beam fuses, through the low beam voltage supply circuits to low headlamp assemblies

[Bobby Kirk]

Thanks Jim,that was helpful,will check things out if the rain ever quits.

 

[JimCost2014]

39 minutes ago, Bobby Kirk said:

Thanks Jim,that was helpful,will check things out if the rain ever quits.

 

You are very welcome, good luck.

 

One other thing, if you are still on your original battery, you might want to have it checked out to see how it is doing.