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Thread: GMLAN data bus system
11-07-2012, 12:55 PM #1
GMLAN data bus system
Been doing some research on the GMLAN data bus system, but can't seem to find a direct answer. I purchased an aftermarket stereo and $5 wiring harness to install in my 06 Silverado. While I was reading about the wiring I came across the device known as the GMLAN data bus system. What exactly does this GMLAN do, where is it located and what functions will I lose by removing my factory radio? My truck doesn't have OnStar or the Bose audio system.
11-07-2012, 03:18 PM #2
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- Sep 2012
I'm not 100% on what all it does do but I'm pretty sure it controls your door chimes. That system may also control your steering wheel controls if you have them.
I literally just got my aftermarket stereo in the mail yesterday from Crutchfield, and mine came with a Metra GMOS-04 interface which keeps the door chimes as well as keeps the factory amp in my Bose system working.
As to where it goes, mine plugs into the truck's harness and then the other side of the interface is wired into the plug that came with and connects to the stereo. So I would assume that the GMLAN is probably the truck's onboard computer system and then the factory radio contains the interface which outputs the door chimes and onstar sound.
I don't really know much about this though, so don't take this to the bank. All I can say for sure is that you need some aftermarket interface if you want to keep the chimes.WAR EAGLE!!!
11-07-2012, 03:18 PM #3
Most if not all the extras (Onstar, Factory Bluetooth, warning chimes, and I am sure I am missing something) all run through the radio. The harness keeps those things working. So in your case the only thing you need is for the chimes. PAC audio has one for like $50.
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11-07-2012, 03:37 PM #4
So in reality I should be able to use the $5 harness to operate my after-market stereo and the only function I will lose is door, key and light chimes? I will admit that sometimes those chimes can get annoying, but I understand their purpose.
11-07-2012, 03:50 PM #5
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- Sep 2012
11-07-2012, 04:25 PM #6
The technician uses the ODB2 port and a TECH 2 analyzer to diagnose the systems.Ray
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11-09-2012, 10:23 AM #7
What I'm thinking about doing now is just using the $5 harness I have and then running a 12v ignition wire for the aftermarket CD player. I like not having the door chimes hooked up, but I would like to retain the feature that leaves the radio turned on after the key has been turned off. What circuit can I run the cd players 12v ignition wire to to keep that function?
11-09-2012, 12:05 PM #8
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11-09-2012, 04:04 PM #9
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