Brad, have you been documenting what you did when adding circuits to the BCM and eliminating the fuse box? I would definitely be interested in that information. I will have to move or eliminate my fuse box since I am thinking there will not be enough room above the transmission with my intercooler setup.
I have not been documenting the internal changes to the BCM with any level of detail. There are many changes that require special tools. I also am not 100% sure this will all work or have the current capacity required. The circuit board appears to be 4 layer, so it is hard to calculate trace capacity without knowing size and height on the middle layers. I'm willing to risk it but would not want someone else to follow in my footsteps.
That all said, you can either move the existing fuse box or re-create it and move it somewhere else. You will need 9-11 relays to replace the existing fuse box. Some of the fuses in the existing fuse box can move to the BCM without modification.
Above you will see the stock BCM fuse layout, there are many vacated spots (6, 9 if a donor with a 3 wire brake switch, 13, 15, 17, 23, 24, 28, 29) with various functions. I have listed the power source for each circuit which tells you how it functions. For example, BCM 1 and 2 are constant power. The ones with RAP or Run/Crank are switched power.
So, for example:
You could move the following constant power fuses from the fusebox to the BCM:
- Outlet to BCM Fuse 6
- DLC to BCM Fuse 23
- Horn to BCM Fuse 24
You could move the following Ignition power fuses from the fusebox to the BCM:
- PCM to BCM Fuse 13
- Backup to BCM Fuse 15
Relays that would need to be replaced:
Starter (+) |
Fuel Pump (+) |
Ignition (+) |
Cooling Fan 1 (-) |
Powertrain (-) |
CHMSL (+) |
Park (-) |
Low Beam (-) |
High Beam (-) |
(I deleted the horn relay. I dont care to have the BCM control the horn. Simple wire from the horn switch to the horn is fine for me).
All the other required fuses in the fuse box are simply a single fuse that is inline with its associated relay (it can be placed before or after). The only exception(s) to this rule is the PCM relay has 4 fused items after the relay and the headlights are split into two fuses each - just combine them into one fuse. If you need more clarity, let me know. This is more of a high level overview.