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
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
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
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.