Onstar FMV Wiring Guide
Thread Starter
Instructor
Joined: Sep 2007
Posts: 117
Likes: 2
Onstar FMV Wiring Guide
I purchased a Onstar FMV Mirror to install on my 2004 and it has 3 wires to connect.
Yellow to 12V (Switched), Red to 12V (Acc), Black to G.
What I want to do to run the mirror is to tap the fuses at the fuse box in the passenger well but I do not what fuses to tap. Every post I read says to use fuse #22 but I have BCM IGN#3 in that position. Any help?
Yellow to 12V (Switched), Red to 12V (Acc), Black to G.
What I want to do to run the mirror is to tap the fuses at the fuse box in the passenger well but I do not what fuses to tap. Every post I read says to use fuse #22 but I have BCM IGN#3 in that position. Any help?
Last edited by gmsuv; Jul 3, 2015 at 05:12 AM.
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
Being a 2004 you do not have the earlier accessory feeds. However, like you say, you can use a fuse adapter to pull from the same circuits since they still exist, just no leads feeding from the fuse box.
Do you really need a feed from ACC or will just "Hot in On" do for both?
A good ground would be the one at the A-Pillar on the passenger side.
I have helped many people do similar things. I have my info at home so I will have to get back to you.
Mr. Sam
Do you really need a feed from ACC or will just "Hot in On" do for both?
A good ground would be the one at the A-Pillar on the passenger side.
I have helped many people do similar things. I have my info at home so I will have to get back to you.
Mr. Sam
Thread Starter
Instructor
Joined: Sep 2007
Posts: 117
Likes: 2
Being a 2004 you do not have the earlier accessory feeds. However, like you say, you can use a fuse adapter to pull from the same circuits since they still exist, just no leads feeding from the fuse box.
Do you really need a feed from ACC or will just "Hot in On" do for both?
A good ground would be the one at the A-Pillar on the passenger side.
I have helped many people do similar things. I have my info at home so I will have to get back to you.
Mr. Sam
Do you really need a feed from ACC or will just "Hot in On" do for both?
A good ground would be the one at the A-Pillar on the passenger side.
I have helped many people do similar things. I have my info at home so I will have to get back to you.
Mr. Sam
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
Fuse 15 in not hot in ACC. It is Hot in ON and Start. That is from the FSM
Fuse 11 (20 amp) is the ignition ON feed for Accessory Power in the I/P fuse box. It is not shared with anything else. You can downsize the fuse size to meet your need and wiring size.
Fuse 11 (20 amp) is the ignition ON feed for Accessory Power in the I/P fuse box. It is not shared with anything else. You can downsize the fuse size to meet your need and wiring size.
Thread Starter
Instructor
Joined: Sep 2007
Posts: 117
Likes: 2
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
Are you sure you have ACC power from Fuse 15?
I just looked at the FSM again and found out that I/P Fuse 11 is also HOT in ACC which I did not know. So that fuse can serve both of your needs.
I just looked at the FSM again and found out that I/P Fuse 11 is also HOT in ACC which I did not know. So that fuse can serve both of your needs.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Instructor
Joined: Sep 2007
Posts: 117
Likes: 2
Thread Starter
Instructor
Joined: Sep 2007
Posts: 117
Likes: 2
Just to confirm what others have said, this is from another post,
"Just read another post that says fuse 22 really doesn't have anything to do with the BCM. Rathere it is an unused switched source of 12 volts that others have used to power aftermarket add ons."
"Just read another post that says fuse 22 really doesn't have anything to do with the BCM. Rathere it is an unused switched source of 12 volts that others have used to power aftermarket add ons."
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
OK, I figured it out. Another GM misdirection. Fuse 22 shows as being for BCM Ignition 3 in all Owners Manuals and in all Factory Service Manuals from 97-04.
However, if you actually look at the BCM connector inputs it was only used from 97-99. BCM connector C1 pin B11.
However, if you actually look at the BCM connector inputs it was only used from 97-99. BCM connector C1 pin B11.
Thread Starter
Instructor
Joined: Sep 2007
Posts: 117
Likes: 2
Fuse #22 is hot in the (RUN) position but not in the ACC position and I want a fuse that is both hot in ACC and Run position.
What fuse can I tap so I don't run down the battery and still be able to use the phone in ACC.