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Old December 21st, 2011, 10:47 PM   #1
MonkeyBiz
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Default 1999 GMC Sierra

I have a NBS 99 sierra, that at I can't idle with out the lights on at night. It doesn't matter if i kick the ebrake down, screw with the switch, If I want to idle the truck at night, the head/tail/parking lights are on. I can't find what has to be done to make it so the lights only come on when the truck is in gear. help?
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Old December 22nd, 2011, 07:53 AM   #2
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If I remember correctly,with the truck on you have to press and release the dome override on/off 4 times.
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Old December 22nd, 2011, 11:01 PM   #3
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check your owners manual.
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Old December 23rd, 2011, 12:03 AM   #4
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Tried the dome override.. No dice. Checked the owner's manual, and it says to depress the emergency brake. Did that, nothing. Something's not connected somewhere... Any other ideas?
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Old December 23rd, 2011, 07:13 AM   #5
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Are you putting the parking brake on first then starting it?

This is from alldata for a 99 nbs.

DRL Circuit


The Daytime Running Lamps (DRL) lights are controlled by the Body Control Module (BCM) via the DRL relay when the headlamp and panel dimmer switch is the AUTO position.

The relay is fed by the IGN E fuse when the ignition switch is in the run and crank position, (the coil side of the relay), and the DRL fuse which is hot at all times. The DRL relay is controlled by the BCM based on the input form the ambient light sensor via CKT 592.

The relay supplies current to the lights through CKT 545 and ground through CKT 150 and ground G100 and G101.

The DRL lights are on when the vehicle ignition switch is in the run position, park brake is not set, daylight conditions exists and the transmission has been in drive before placing in park. The DRL lights are turned off when the headlamp and panel dimmer switch is turned to the park or head position or the input to the BCM from the ambient light sensor signals that daylight conditions does not exists any more.

Last edited by IFS SUCKS; December 23rd, 2011 at 07:19 AM.
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Old December 23rd, 2011, 12:23 PM   #6
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Yes, I tried it with the parking brake set before and after I turn it on. My switch doesn't have an auto setting. There are only 3. Off, parking lights, headlights. The dome override switch works for controlling the dome when the door is open.
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Old December 23rd, 2011, 12:51 PM   #7
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This is for a 2000 nbs

Description and Operation


The daytime running lamps (DRL) lights are controlled by the body control module (BCM) via the DRL relay when the headlamp and panel dimmer switch is the AUTO position.

The relay is feed by the IGNE fuse when the ignition switch is in the run and crank position, (the coil side of the relay), and the DRL fuse which is hot at all times. The DRL relay is controlled by the BCM based on the input form the ambient light sensor via CKT 592.

The relay supplies current to the lights through CKT 545 and ground through CKT 150 and ground G100.

The DRL lights are on when the vehicle ignition switch is in the run position, park brake is not set, daylight conditions exists and the transmission has been in drive before placing in park. The DRL lights are turned off when the headlamp and panel dimmer switch is turned to the park or head position or the input to the BCM from the ambient light sensor signals that daylight conditions does not exists any more.

NOTE: (For US application only, Prohibited in Canada (RPO Z49)) You may, for the current ignition on cycle, turn off the DRL and the Automatic Headlamp (AHL) feature by following the steps below:

The ignition is in the Run position.
Press the dome lamp defeat switch 4 times. After the 4th press of the switch the chime will sound informing you the procedure is complete. Turning the ignition off and then on will place the DRL and AHL back in the automatic mode. This does not apply to some early built pickups.
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Old December 23rd, 2011, 01:22 PM   #8
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hmmm.. I'm not getting a chime....
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Old December 23rd, 2011, 04:01 PM   #9
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Quote:
Originally Posted by MonkeyBiz View Post
hmmm.. I'm not getting a chime....
NOTE: (For US application only, Prohibited in Canada (RPO Z49)) You may, for the current ignition on cycle, turn off the DRL and the Automatic Headlamp (AHL) feature by following the steps below:

This?
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Old December 23rd, 2011, 04:11 PM   #10
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My 99 sierra that I used to have was the same way. None of that stiff worked to turn the lights off.
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Old December 23rd, 2011, 05:09 PM   #11
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You can always replace the photocell on the dash with a resistor but then you won't have the auto feature.
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