Radium EMS Instruction Manual - page 23
Spare Output
In the standard EMS kit, the output GPIO#6 is used to activate the Lotus Air Box Valve which is used to
increase induction sound at high engine speeds. If the optional auxiliary harness was purchased, an
integrated fuse and relay comes prewired and can be used for just about anything. The integrated white
2-pin connector will plug into a Spal fan, if needed. However, this output also uses GPIO#6, meaning that
both this output and the Lotus air box valve (if still used) will be activated using the same conditions
defined in the AEMTuner software.
For 04-05 kits, mount the relay and fuse to the spare rivet
nuts on the EMS bracket. For 06+ kits, use the one spare rivet
nut and secure the fuse holder nearby. Screws included.
The spare output requires the aux harness power and ground
ring terminals to be connected. There is a factory ground lug
and 12V power box both located below the throttle body
area on the firewall secured with M8 nuts.
Radium PnP Switches
The optional plug and play switches do NOT require the
Radium auxiliary harness. These are simple to install and
do not require cutting or splicing.
For 2004-2005 EMS kits, the switches’ green connector will
secure to the mating green connector that is part of the
Radium main harness.
For 2006+ EMS kits, the switches’ green connector will
secure to the mating green connector that is found in the
factory wiring loom located underneath the center
console. If the vehicle came standard with Lotus T/C, the
factory switch will not work in this system.
If the Radium traction control switch and the Radium
power selector switch were both purchased, the Radium Y-
harness (shown at left) is necessary for proper mounting
and connecting.
To secure the switches in the factory location, the two
Torx bolts on either side of the center console will need to
be removed. Pull the center console up just enough to
unplug the hazard switch and the factory traction control
switch (if applicable). To mount the switches, a ½” drilled
hole is necessary for securing. If inserting into the factory
traction control switch location (if applicable), no
modification is necessary.
Note: Traction Control uses GPIO#8 and PWR Select uses GPIO#2 as described in the following section.