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Keep'n 'em spooled
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The Tour/Sport switch you showed that you are missing is for the Active Exhaust. Both ECS and Active Exhaust have a pair of green "Tour" and "Sport" lights.

As BlackStealth said, the ECS button is to the right of the instrument pod:

 

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Keep'n 'em spooled
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2,770 Posts
In summary, when the ECS button is out, it is in automatic mode (anti-dive under hard braking, anti-roll from rapid steering wheel turning, etc.) and has 3 levels of stiffness. It is in the softest mode during normal driving. When the button is in, it holds the suspension in the hardest/stiffest mode, sport.

More details:
Title: Electronic Control Suspension (ECS)
Source: 1991 3000GT Service Manual (pg 33B-18,19)

When in Sport mode selected the suspension is set at Hard.

When in Tour mode the following Control Functions are active:

Anti-Roll
If the steering wheel is rotated 90 degrees within 0.3 seconds
then the suspension is set at Medium. If this change occurs
within 0.2 seconds then it is set at Hard.

Anti-Dive
If the speed of the vehicle drops quickly during braking then
the suspension is set at Hard.

Anti-Squat
The suspension will harden at low speeds when accelerating
quickly. During hard acceleration at 30km/h the suspension
is set at Hard, at 60km/h it is set at Medium, at 90km/h it
is set at Soft. At all speeds suspension will change to
Medium after a second of acceleration.

High Speed Sensitive
When accelerating the suspension will change from Soft to
Medium at 130km/h and will revert back to soft when the
speed drops below 120km/h.

Pitching and Bouncing
If the vehicle's body bounces up and down by approx 5cm within
a second then the suspension is set at Hard until this motion
ceases.
 

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Keep'n 'em spooled
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2,770 Posts
. . . Can you actually tell when different suspension levels are operative?
If you're driving on a road with some bumps, and you switch to Sport mode, you can feel that the suspension gets stiffer. Otherwise it's hard to tell when anti-dive and anti-roll are activated.
 

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Keep'n 'em spooled
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2,770 Posts
Most definitely a lot of useful information but the initial question at the start of the forum is basically how to wire up a toggle switch where the tour and sport button should be. Like it's a five pin connector and I can get a switch with 5 connection points. I just need to know which wire goes to which point on the switch lol. Would anyone happen to have that information??😁😁
So you want to restore the Active Exhaust function? Just buy a used switch from someone. You'll need to free up the valve in the exhaust pipe and make sure the actuating cable and motor are still in place.
You can download the Service Manuals for free from 3SX, one of the 3S Facebook Groups, and a few other places I can't remember at the moment.
 
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