Got LMC5 today
Thread Starter
Racer
Joined: Aug 2016
Posts: 317
Likes: 42
Got LMC5 today
I got my LMC5 in the mail today and I guess I'll do it tomorrow. I've read through the instructions and it looks pretty simple other than the little bit confusing first step.
I have a perfect functioning system so do first put the key in and then turn the igniton on and then pull fuse 23 in that order and then unhook the battery?
That is the part that is a little confusing since that part is on a separate page and not listed in STEP ONE.
Also is there a need to do anything with the brown wire if everything seems ok after the instalation? It reads to me like it's only used if there are messages being displayed. I have never had a message of any kind on this car yet and would just like to leave it unhooked if it isn't really needed.
I have a perfect functioning system so do first put the key in and then turn the igniton on and then pull fuse 23 in that order and then unhook the battery?
That is the part that is a little confusing since that part is on a separate page and not listed in STEP ONE.
Also is there a need to do anything with the brown wire if everything seems ok after the instalation? It reads to me like it's only used if there are messages being displayed. I have never had a message of any kind on this car yet and would just like to leave it unhooked if it isn't really needed.
Melting Slicks
Joined: Mar 2009
Posts: 2,300
Likes: 115
From: Odessa FL
St. Jude Donor '10-'12-'13-'14-'15-'16-'17
I got my LMC5 in the mail today and I guess I'll do it tomorrow. I've read through the instructions and it looks pretty simple other than the little bit confusing first step.
I have a perfect functioning system so do first put the key in and then turn the igniton on and then pull fuse 23 in that order and then unhook the battery?
That is the part that is a little confusing since that part is on a separate page and not listed in STEP ONE.
Also is there a need to do anything with the brown wire if everything seems ok after the instalation? It reads to me like it's only used if there are messages being displayed. I have never had a message of any kind on this car yet and would just like to leave it unhooked if it isn't really needed.
I have a perfect functioning system so do first put the key in and then turn the igniton on and then pull fuse 23 in that order and then unhook the battery?
That is the part that is a little confusing since that part is on a separate page and not listed in STEP ONE.
Also is there a need to do anything with the brown wire if everything seems ok after the instalation? It reads to me like it's only used if there are messages being displayed. I have never had a message of any kind on this car yet and would just like to leave it unhooked if it isn't really needed.
Le Mans Master
Joined: Mar 2004
Posts: 8,700
Likes: 298
From: Ft. Lauderdale Fl
I got my LMC5 in the mail today and I guess I'll do it tomorrow. I've read through the instructions and it looks pretty simple other than the little bit confusing first step.
I have a perfect functioning system so do first put the key in and then turn the igniton on and then pull fuse 23 in that order and then unhook the battery?
That is the part that is a little confusing since that part is on a separate page and not listed in STEP ONE.
Also is there a need to do anything with the brown wire if everything seems ok after the instalation? It reads to me like it's only used if there are messages being displayed. I have never had a message of any kind on this car yet and would just like to leave it unhooked if it isn't really needed.
I have a perfect functioning system so do first put the key in and then turn the igniton on and then pull fuse 23 in that order and then unhook the battery?
That is the part that is a little confusing since that part is on a separate page and not listed in STEP ONE.
Also is there a need to do anything with the brown wire if everything seems ok after the instalation? It reads to me like it's only used if there are messages being displayed. I have never had a message of any kind on this car yet and would just like to leave it unhooked if it isn't really needed.
Melting Slicks
Joined: Nov 2014
Posts: 3,399
Likes: 1,339
From: Havre de Grace Maryland
The instructions say the Brown wire mode is optional. Do it anyway. It saves you time should the gremlin "pull Key" message comes up after the LMC5 install. The LMC5 and brown wire install is very easy even for me as a challenged car DIYer. 
1/4 mile/AutoX
Joined: Jun 2014
Posts: 11,439
Likes: 2,184
From: Buffalo Texas
Drifting
Joined: Jun 2013
Posts: 1,957
Likes: 342
From: Shell Point (Crawfordville) Florida
I also would agree and advise to do the brown wire mod at the time of initial install. You have it all opened up anyway so it's much easier than going back to do it later when that message comes up and the car is stuck at 1mph. My initial install was fine for about a month and then I got the message and the car shut off, etc,. so I had to go back and do the mod later anyway. Was very friggin annoying, and lucky for me I was home when that happened.
Last edited by mrlmd; Feb 1, 2017 at 02:39 PM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
Safety Car
Joined: Jan 2012
Posts: 3,956
Likes: 520
From: Da U.P.
Mine doesn't do the pull key wait 10 seconds anymore, it's just stuck on service column lock and has no 1mph fuel cut. I feel like I shouldn't touch the car until I get an LMC5, am I right where I want to be? I feel lucky it didn't do this in the locked position.
Drifting
Joined: Apr 2010
Posts: 1,479
Likes: 33
From: Jacksonville Florida
Mine doesn't do the pull key wait 10 seconds anymore, it's just stuck on service column lock and has no 1mph fuel cut. I feel like I shouldn't touch the car until I get an LMC5, am I right where I want to be? I feel lucky it didn't do this in the locked position.
Instructor
Joined: Dec 2016
Posts: 172
Likes: 57
Lots of possibilities as to what has failed. Only way to know specifically is to know what has been done to the column lock system prior to your ownership. But with an LMC5 installed it becomes moot as to what has been done previously because the LMC5 abandons all factory and recall wiring downstream of the BCM.
Your best bet is to get and install an LMC5 and do the brown wire mod WHEN you install it. ie don't wait for the "pull key...." message to happen.
Your best bet is to get and install an LMC5 and do the brown wire mod WHEN you install it. ie don't wait for the "pull key...." message to happen.