This article is an adaptation of my first 4/6-hi mod for V8 EXT/XL Owners. LINK HERE.
I don't actually own a TBSS, however a friend of mine does. So I got to get my hands on HARMLESS! <insert your best evil grin here>
Harmless's owner had asked me for a 6-hi mod for his TBSS.
His requirements were the same as mine.
- All OEM functions had to work. This includes perimeter lighting, auto dusk/dawn, on with door locking, flash to pass, manual control of fogs, everything was to stay OEM.
- No high current wiring allowed. All wiring was to be done before the relays.
- No mucking around under dash or under rear seats.
- Easily removable for troubleshooting or sending back to dealer.
I had already achieved this with the extended wheelbase V8's by putting my wiring in the underhood fuse block. I also knew the 4.6 I6 underhood fuse block was different than my 5.3, but would the TBSS be different as well?????
The answer was NO! The TBSS underhood fuseblock was identical to the 5.3!
Here is how I made up the 6-hi mod kit for a TBSS in under 15 minutes for no $$$.
*NOTE: Diodes are the biggest thing this mod needs. 2 for 6-hi or 1 for 4-hi. They can be found for free in any old broken computer ATX power supply. Ask for a broken one at your local computer shop.
$ REQUIRED:
0
PARTS REQUIRED:
QTY 3 Random colored lengths of multistrand wire.
QTY 2 Diodes
TOOLS REQUIRED:
Wire stripper/cutter
Soldering Iron
Flux
Solder
Black Electrical Tape
TIME REQUIRED:
15 Minutes
Gather up your supplies.
Twist the two ends of the Diodes with the silver band together and begin to solder a wire on each leg.
When your done soldering, it should look something like this. Perhaps a bit neater.
Look at how clean under Harmless's hood is. You might think that it's owner details vehicles or something. Mine is nowhere near as clean.
The three legs have to be attached to the pins of the following three relays like this.
Relay#43, Pin #85.
Relay#39, Pin #85.
Relay#46, Pin #5.
Stop Here. Run a test. Turn on your headlights at the switch, flip over to highs. Do you see all of your headlight/fog lights on? Perfect!
If not, then go back and check your pin wrappings.
Proceed to tape up the diodes, and reassemble.
That's it! Your Done!
A nice clean method of adding the 4 or 6-hi mod to a TBSS!
NOTES:
* 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 the TBSS 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.
Because you are increasing the light output when on high beams, please be considerate of other drivers and turn them off when you see oncomming traffic.
Even if it's far away.
Even if it's on the other side of the divided highway.
Especially if you see red taillights ahead of you....turn off your high beams!
I don't actually own a TBSS, however a friend of mine does. So I got to get my hands on HARMLESS! <insert your best evil grin here>
Harmless's owner had asked me for a 6-hi mod for his TBSS.
His requirements were the same as mine.
- All OEM functions had to work. This includes perimeter lighting, auto dusk/dawn, on with door locking, flash to pass, manual control of fogs, everything was to stay OEM.
- No high current wiring allowed. All wiring was to be done before the relays.
- No mucking around under dash or under rear seats.
- Easily removable for troubleshooting or sending back to dealer.
I had already achieved this with the extended wheelbase V8's by putting my wiring in the underhood fuse block. I also knew the 4.6 I6 underhood fuse block was different than my 5.3, but would the TBSS be different as well?????
The answer was NO! The TBSS underhood fuseblock was identical to the 5.3!
Here is how I made up the 6-hi mod kit for a TBSS in under 15 minutes for no $$$.
*NOTE: Diodes are the biggest thing this mod needs. 2 for 6-hi or 1 for 4-hi. They can be found for free in any old broken computer ATX power supply. Ask for a broken one at your local computer shop.
$ REQUIRED:
0
PARTS REQUIRED:
QTY 3 Random colored lengths of multistrand wire.
QTY 2 Diodes
TOOLS REQUIRED:
Wire stripper/cutter
Soldering Iron
Flux
Solder
Black Electrical Tape
TIME REQUIRED:
15 Minutes
Gather up your supplies.
Twist the two ends of the Diodes with the silver band together and begin to solder a wire on each leg.
When your done soldering, it should look something like this. Perhaps a bit neater.
Look at how clean under Harmless's hood is. You might think that it's owner details vehicles or something. Mine is nowhere near as clean.
The three legs have to be attached to the pins of the following three relays like this.
Relay#43, Pin #85.
Relay#39, Pin #85.
Relay#46, Pin #5.
Stop Here. Run a test. Turn on your headlights at the switch, flip over to highs. Do you see all of your headlight/fog lights on? Perfect!
If not, then go back and check your pin wrappings.
Proceed to tape up the diodes, and reassemble.
That's it! Your Done!
A nice clean method of adding the 4 or 6-hi mod to a TBSS!
NOTES:
* 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 the TBSS 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.
Because you are increasing the light output when on high beams, please be considerate of other drivers and turn them off when you see oncomming traffic.
Even if it's far away.
Even if it's on the other side of the divided highway.
Especially if you see red taillights ahead of you....turn off your high beams!
I should have been paying more attention to Garnet... 
Oh right. I was under HIS hood trying to revive a dead Envoy!!! 
).)
