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Old 07-01-2003, 08:41 AM   #1
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HOW TO: Override DRLs on a GA

Ok. This I know for sure works on 99-00 model GAs. This makes for an alternative for the DRL kits that are no longer in production. There is hint that a fully Plug and Play version is underway which I would recommend if you want to return to stock easily. If you are brave enough to mess with the BCM wiring there here you go.

First do not remove any relays or fuses; however, I highly recommend that you unplug your negative battery terminal.. Don't want to risk popping fuses or pooching the Body Control Module (BCM).

The BCM is located on the passenger side under the dash. There isn't much space to work with so to get the most space I would recommend that you remove your glovebox as well as the under dash panels. The BCM looks like a black box about the size of a CD jewel case. It will have 3 connectors.. 1 pink and two gray.

no drl
at the BCM, locate Connector C2 (center)

On the "B" side row of pins, locate the dark blue wire (b4)

Cut this wire, leaving as much as possible still attached to the BCM.

Now simply add on a piece of wire to the side that is still connected to the body control module. attach this wire to a good ground, like a screw in the metal part of the dashbehind the glove box or I used the interior light mounting bracket screw right there next to the BCM.

The BCM now see's this to mean that the regular headlights are on, and so it energizes the relay that turns off the DRL's.

ALC bypass
at connector C2 find A3 the yellow/black wire, and B2 light green/black wire.. be careful because there are two light green/black wires on that connector.. the one you want is closest to the yellow/black wire.

cut these wires again leaving as much wire as possible attached to the BCM.. simply tie the two wires together and tape them up real good. (this is the same thing as removing ambient light sensor and adding a jumper wire)

The BCM will now think that it is daylight all the time and it will not energize the relay to turn on the headlights.

independant fogs instructions are available just PM me. Most people have been concerned about DRL and ALC bypasses..

Thanks to Monello and Iceman for helping me the instructions and correct pinouts.
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Last edited by armith; 07-03-2003 at 02:15 PM.
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Old 07-01-2003, 02:37 PM   #2
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Wow... DRL and ALC bypass was easy... thanks armith!
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Old 07-02-2003, 04:12 PM   #3
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is there a way that i could wire my regular headlamps to a switch so they could be turned off when i want to turn them off?
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Old 07-02-2003, 04:25 PM   #4
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SVS.....???
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Old 07-02-2003, 04:39 PM   #5
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i pm'ed him earlier, he said no svs light on 1999 and 2000 GAs (those are the only ones he tested)

I am gonna try it on my 1999 GA this weekend and will take pics of procedure and post them if it works. If I get a svs light all i have to do is re-join the wire with the original one.
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Old 07-02-2003, 04:41 PM   #6
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Ok.. because I know mine (2001) has a lead where the BCM knows if the switch is in the auto position.. and if light relays are turned on, svs comes on right quick..
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Old 07-02-2003, 06:16 PM   #7
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Quote:
Originally posted by zhd1000
is there a way that i could wire my regular headlamps to a switch so they could be turned off when i want to turn them off?
what year? the ALC bypass does just that.

And no SVS light.
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Old 07-02-2003, 06:24 PM   #8
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I am going to try this on my 2001 this weekend, will post the results.
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Old 07-02-2003, 06:25 PM   #9
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Quote:
Originally posted by Black2K1GT
I am going to try this on my 2001 this weekend, will post the results.
Quote:
Originally posted by iceman
Ok.. because I know mine (2001) has a lead where the BCM knows if the switch is in the auto position.. and if light relays are turned on, svs comes on right quick..
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Old 07-02-2003, 06:38 PM   #10
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Quote:
Originally posted by peeps
Opps, bad timing
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Old 07-02-2003, 07:15 PM   #11
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Hey you are welcome to try
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Old 07-02-2003, 07:22 PM   #12
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Quote:
Originally posted by iceman
Hey you are welcome to try
I will give it a try and see what happens......what is the worst that could happen.......
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Old 07-02-2003, 08:04 PM   #13
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Has anyone tried to put this procedure on a switch?
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Old 07-02-2003, 08:08 PM   #14
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Sweet armith!!

I'm gonna try also this weekend!

Did you have a schematic or something?
How'd you find this?
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Old 07-02-2003, 08:10 PM   #15
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im giving it a try this weekend, if i find a switch sitting around my messy garage (likely i will) ill put it on there.
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Old 07-02-2003, 08:16 PM   #16
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Well if you want to switch between stock / mod.. easily done with a relay.

Pin 85 - ground
Pin 86 - + from a switch

Pin 30 - BCM side of that wire listed (C2-B4)
Pin 87A - Car side of that wire
Pin 87 - ground


switch on, turns on override.. switch off.. stock
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Old 07-03-2003, 06:06 AM   #17
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I had some help with someone who had done the overrides on their car.. Gave me the instructions.. was a little confused on certain parts.. I then happened to find a schematic on how the light systems work.. did a little trial and error luckily succeeded first time.

See I thought there was something a little different with the 01+ models.. Thats why I made sure I posted 99-00. Knowing that the biggest difference is with our models.. Our choice was DRLs, full head lights or full headlights.. I know the 01 and up have that wonderful option of flipping to parking lights and taping the light sensor..

Wonder what kind of rocket science complicated wiring they will come up with now that all this has been cracked. I'm sure the 04 or Gen 6 models will have something like override the DRLs and it will burn out a tail light or something. hmm.. wonder if Amber has her DRLs bypassed?
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Old 07-03-2003, 06:27 AM   #18
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03 you can yank the relay and you dont get a svs
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Old 07-03-2003, 07:02 AM   #19
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Took them 4 years to engineer it to do that too I guess
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Old 07-03-2003, 08:08 AM   #20
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HOW TO UPDATED

ok I added the ALC bypass to my first post with the DRL instructions. Thanx to Iceman for sending me the correct pinouts for the Light Sensor wire.

Correct me if I'm wrong those of you with 01 and up.. but I do believe that the ALC bypass should still work for ya because the instructions are the same as removing the Ambient Light Sensor and adding a piece of wire.. Is this the case? or will this throw a SVS?
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