This Article describes my modification which is an adaption of the DIODE method to acheive the 4-hi or the 6-hi mod for V8 EXT/XL owners who don't want to remove thier back seat to get to the BCM. This is done by moving the diode installation from the BCM to the underhood fuse box.
* For the I6 EXT/XL owners, do not fret. I have to do my wife's soon. I post up an article for the I6 owners when I get it done.
* I do not claim ownership of this mod. This has been done many many times by many many people across many many types of vehicles. All I've done is adapt it to work for us V8 EXT/XL owners who do not want to mess with thier rear seat.
* This mod should be a prerequisite if installing HID's in your Lows. This mod will eliminate the warm up delay experienced when switching from high's back to lows.
* This mod retains ALL OEM functions. Everything factory still works as intended.
* When installing this mod, Don't be in a hurry! Haste makes Waste! Make sure that you have a lazy afternoon off and have all your items/tools available and verified.
Time to Complete:
1 hour including cleanup
Tools and Items required:
x2 Diodes
x3 Misc lengths of 22AWG wire
x1 Beer
Black Electrical tape
Wire Stripper
Your Soldering Kit
Ready to begin? Here we go!
- I was installing Hid's at the same time so I have all of my items and tools spread out and verified before I begin.
- Strip both ends of the three peices of wire
- Remove Relay#46. Wrap one end of one peice of wire around pin#5. Reinsert Relay #46. : This is your Low Beam relay.
- Remove Relay#43. Wrap one end of one peice of wire around pin#85. Reinsert Relay #43. : This is your High Beam relay.
- Remove Relay#39. Wrap one end of one peice of wire around pin#85. Reinsert Relay #39. : This is your Fog Light relay.
- Wrap the end of wire from Relay#39 around the first diode lead that does not have the silver band.
- Wrap the end of wire from Relay#43 around the first diode lead from the last step. It should have the silver band around it.
- Wrap the end of wire from Relay#46 around the second diode lead that does not have the silver band.
- Wrap the end of the second diode lead that has the silver band around the lead of the first diode lead that also has the silver band around it.
- Stop work. This is where you can go test the system to make sure that all leads are set correctly. Turn your lights on. Check for Lows. Flip the multifunction switch to high beams. Now check for all lights being on. They are? Good, let's keep going!
- Solder all diode lead connections.
- Wrap up the contraption softly with strips of black electrical tape. It should look like this;
- Replace the underhood fuse block covers.
- Step back with your beer in hand and enjoy your craftsmanship! Job well Done!
* For the I6 EXT/XL owners, do not fret. I have to do my wife's soon. I post up an article for the I6 owners when I get it done.
* I do not claim ownership of this mod. This has been done many many times by many many people across many many types of vehicles. All I've done is adapt it to work for us V8 EXT/XL owners who do not want to mess with thier rear seat.
* This mod should be a prerequisite if installing HID's in your Lows. This mod will eliminate the warm up delay experienced when switching from high's back to lows.
* This mod retains ALL OEM functions. Everything factory still works as intended.
* When installing this mod, Don't be in a hurry! Haste makes Waste! Make sure that you have a lazy afternoon off and have all your items/tools available and verified.
Time to Complete:
1 hour including cleanup
Tools and Items required:
x2 Diodes
x3 Misc lengths of 22AWG wire
x1 Beer
Black Electrical tape
Wire Stripper
Your Soldering Kit
Ready to begin? Here we go!
- I was installing Hid's at the same time so I have all of my items and tools spread out and verified before I begin.
- Strip both ends of the three peices of wire
- Remove Relay#46. Wrap one end of one peice of wire around pin#5. Reinsert Relay #46. : This is your Low Beam relay.
- Remove Relay#43. Wrap one end of one peice of wire around pin#85. Reinsert Relay #43. : This is your High Beam relay.
- Remove Relay#39. Wrap one end of one peice of wire around pin#85. Reinsert Relay #39. : This is your Fog Light relay.
- Wrap the end of wire from Relay#39 around the first diode lead that does not have the silver band.
- Wrap the end of wire from Relay#43 around the first diode lead from the last step. It should have the silver band around it.
- Wrap the end of wire from Relay#46 around the second diode lead that does not have the silver band.
- Wrap the end of the second diode lead that has the silver band around the lead of the first diode lead that also has the silver band around it.
- Stop work. This is where you can go test the system to make sure that all leads are set correctly. Turn your lights on. Check for Lows. Flip the multifunction switch to high beams. Now check for all lights being on. They are? Good, let's keep going!
- Solder all diode lead connections.
- Wrap up the contraption softly with strips of black electrical tape. It should look like this;
- Replace the underhood fuse block covers.
- Step back with your beer in hand and enjoy your craftsmanship! Job well Done!
Nice to know there's an option where I don't have to try and yank out my back seat by myself. Very nice! 
That's what the pin swap does 
Well said 
