Driving/head lamp disabling with dome lamp bypass switch

Here's a subject I know has come up before. Let's see if anyone has an answer this time:
I have a 2001 S-10 that I drive for work. If I push the dome lamp
bypass (disable) switch 4 times in 5-6 seconds, I get an audible ding, and all forward pointing lights (driving and regular headlamps) will turn off. Another 4 pushes and they will turn back on. This works at any time.
My '99 S-10 Blazer does not have this feature, even though the interior is identical. The headlamp switch modules are identical. I know the light disable feature in not part of the switch module.
Question 1: Is there a way to add this feature to my '99 by reprogramming the BCM? I've spoken to several mechanics at one of the local dealerships and they all looked at me like I was speaking a foreign language or something.
Question 2: I noticed that there is a second wiring harness plugged into a dead-end slot on the headlamp switch module (no electrical connection). What is this for? Is there some option that my LS does not come standard with? Maybe fog lamps? I have yet to see a headlamp switch module with something in the same location as that harness...
Not Dead Yet
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On Sat, 26 Jun 2004 13:17:55 GMT, NotDeadYet

Possibly, but I think you'd be a guinea pig for it.
FYI, the DRL/AHL disable trick was not a feature until 2000.

I saw that when I had my dash apart the other day. I figure it's for the fog lamps, which I don't have. That's where the fog switch is. I don't know if the wires go anywhere except a dead-end in the harness.

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Mike Levy wrote:

That plug is for the fog lamp switch. I bought a new switch for mine from the JY then found out that the headlight harness is different so I would have to go back and get the head/park/signal/fog light harness, then the BCM has to be reprogrammed to allow the foglamp switch to work. I'm heard that one person did it, so it seem that programming the 4 press disable should be possible as well if you can find a clueful dealer.
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Seems to me that the phrase "re-flash my BCM and pretend it's a 2002 model" should work fine at any dealer, but life is seldom easy. GW
Eugene wrote:

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I don't think it's possible for them to do this - the programming system won't allow you to flash the "wrong" calibration into modules in this way..
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I doubt that the 1999 BCM hardware would accept software designed for the newer 2001.
The DRL/Auto HL disable function is a good feature though...give customers the choice between the two. The full size trucks (Silverado, etc) and SUVs (Tahoe, etc) have it too. The people I know that use the disable mode wish that it would stay set to the way they want it (it resets to enable during each ignition sequence..which is incredibly idoitic)
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