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DRLs defeat ?

matuva

matuva

Tropical 6.5er
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Hi,

A buddy owns a 1999 Silverado (gasser) new style (what he says ):h

He is deseperately looking for how to disable DRLs.

I've been trying with him, pulling fuse, relay ... DRLs are still on :confused:

Anybody knows how to get rid of DRLs ob this year truck ?

Thanks.
 
Not on a 99 they're not. DRL's are their own separate bulbs and do not function as anything else.

On a 98 and older, yes, the low beams are the DRL's. The 99's and newer have their own separate housing, which live next door to the turn signals.

The body styles changed for the Silverados and Sierras in 99 for the half tons. The Tahoes, Burbans and the heavy duty fleet line of trucks all retained the older pre 98 style. I had a 99 Tahoe and it was the older generation platform.
 
x2 what Nick said, now I can do a write up a what tab to cut off the headlight relay on the older body style if thats the case :)
 
If you'd like to disable the auto headlights you have to put a resistor in place of the ambient light sensor in the dash.
 
88gmctruck, you do point to the right thing. Any idea of the value of the resistor and the power it should be able to handle ?

Can we easely access and replace this sensor ?

I may have made a confusion between DRLs and auto headlights. I do apologize, and beg your pardon if I used wrong terms.

Little frenchie that I am sometimes still makes confusion while speaking or typing in english :D


In fact, what the guy wants to achieve is to be able to choose and decide himself when the headlights have to be on, he wants to be able to go stealth mode if necessary, and in fact, he doesn't like a machine deciding for him.

At the moment; as soon as the ambient light dims down, the low beam switches on... and my buddy tells words I can't report here ):h
 
He needs to disable the auto light sensor then. Its got nothing to do with DRL's.

There's a thread here on it. Lemme see if I can find it.

I disabled my light sensor and I have full control of all my lights, all the time.
 
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If it's DRLs, leave 'em on. Studies have shown that they reduce front-end collisions by something like 25%, which is statistically significant in anyone's book.

They help to protect you from morons...

If you really ant to disable a DRL circuit, look for the DRL relay in newer vehicles, or just engage the PBL relay by dropping the park brake one click.
 
You have to be careful with the wires in those plugs under the dash because they had a subtle change in '03 or '04 (can't remember now which year). Unless someone here says positively that it works for both a '99 and say an '05 I'd be leery. I found that out the hard way when disabling the Key-in-ignition-door-open-chime for some of our fleet trucks during the crossover year. When I had my '99 I replaced the sensor in the dash with a resistor, bought it at radio shack. Sorry to say I don't remember what size, but it wasn't very big. I don't even remember what forum I got the idea from, it was pre DP. You might be able to Google it.
 
99-02 should be wired the same. Major changes happened in 2003. You may be right.
 
matuva said:
Nick, is that the thread you're talking about ? : http://www.thetruckstop.us/forum/showthread.php?t=4808&highlight=disable+auto+light+sensor

I will check it, hope it applies to 1999 ;)

Though I'm a bit confused. I found some threads saying instead of jumping the 2 wires, you should add a resistor. Some say 10 ohms, others 1.5 Kohms...:thinking:
Click to expand...

I put a diode in mine, not a resistor.

JiFaire said:
If it's DRLs, leave 'em on. Studies have shown that they reduce front-end collisions by something like 25%, which is statistically significant in anyone's book.

They help to protect you from morons...

If you really ant to disable a DRL circuit, look for the DRL relay in newer vehicles, or just engage the PBL relay by dropping the park brake one click.
Click to expand...

I hate not having control of my lights, or anything else in the truck, like automatic door locks. :nono: I'm one of those people who ALWAYS runs my parking lights anyway, which is even safer IMO. In my 02, instead of running 2 bulbs there are 6 going. My 88 is an entirely different story, it has 11 forward facing amber lights :D

trouttrooper said:
You have to be careful with the wires in those plugs under the dash because they had a subtle change in '03 or '04 (can't remember now which year). Unless someone here says positively that it works for both a '99 and say an '05 I'd be leery. I found that out the hard way when disabling the Key-in-ignition-door-open-chime for some of our fleet trucks during the crossover year. When I had my '99 I replaced the sensor in the dash with a resistor, bought it at radio shack. Sorry to say I don't remember what size, but it wasn't very big. I don't even remember what forum I got the idea from, it was pre DP. You might be able to Google it.
Click to expand...

99-02 are the same with a few small exceptions (99 had a different airbag system), 03+ the wiring BCM and IP changed dramatically. I do know disabling the dash sensor is the same 99-07, as i've done the same thing with the diode in quite a few rigs.
 
Found this at the other place : "To disable the auto headlights you need a 1.5K ohm resistor (Radio Shack) and 2 Scotchlok Tap Connectors (Walmart).

First locate the Body Control Module (BCM) which is under the dash, below the steering column. Laying on the floor, this should be visible without removing any dash panels. You should find a purple connector (C3). Unplug it.

Locate the white and gray wires (A4 and A6). I don't remember if white is A4 and gray is A6 or vice versa. It doesn't matter anyway. BTW - there are two gray wires in the connector. The one you want is the one farthest away from the white wire.

Tap the gray wire from the plug (C3) to one end of the resistor and the white wire to the other end. You don't need to cut the wires. Make sure you tape up all wires to prevent a short. You should now have a gray wire coming from C3 tapped to one lead of the resistor and the white wire from C3 tapped to the other resistor lead *. Plug C3 back into the BCM. Start the truck and make sure the lights are off. Throw a dark towel or something over the light sensor on the dash and verify the lights stay off. Try your light switch that has probably never been used and that's it! Takes about 5 minutes."

"the Point of the resistor is to fool the sensor that it is all ways daytime, but your little drl's come on when you shift into gear, but those aint bright dont let that surprise you


That was for a 2001, so I do believe it will work on a 1999 ?
 
btw....old classic style existed in 99. I bought one. Didn't want the newer style yet as I didn't know what to expect from that motor. classic drl would turn on low beams at a reduce brightness, newer drl's had seperate bulbs and you could just remove the bulbs or the fuse for them. Using a resistor as stated earlier across the sensor would disable the auto mode on the lights. And the resisitor will work on all models. Our game warden had them to install a resistor so his lights wouldn't come on automaticlly. He liked to sneek up on people.....
 
SfcJones said:
btw....old classic style existed in 99. I bought one. Didn't want the newer style yet as I didn't know what to expect from that motor. classic drl would turn on low beams at a reduce brightness, newer drl's had seperate bulbs and you could just remove the bulbs or the fuse for them. Using a resistor as stated earlier across the sensor would disable the auto mode on the lights. And the resisitor will work on all models. Our game warden had them to install a resistor so his lights wouldn't come on automaticlly. He liked to sneek up on people.....
Click to expand...

Correct you are. They are also available (selective models) in 2000. I thought you could just pull the DRL fuse in the driver's side dash (upper, the door closes against it) and disable the DRLs.
 
If pulling fuses, wiring in diodes, resistors and what not are not your cup of whiskey, I believe you can press the 'dome override' button 3 times in a row and the DRL's will disable. Although it *could* get old repeating this every time you saddle up.

IIRC it's the dome override button.
 

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the dome override was for turning off auto-headlights IIRC. A function that is NOT available on the '99 and partway through '00 pickups
 
Hmmm

Or is it push 3 times and hold on the 3rd? I'll have to get the scooop from a friend who owns the truck below. I remember him easily turning off his DRL's
 

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