I have just bought a 1999 GTT ER34 as well ... waiting for Compliance to become available again before I import. But I have a translated Japanese manual I bought from www.importdrive.com.au ... it was about $50 I think... for those interested.
As far as I can tell from the book cars fitted with TCS have a button on the left hand side just under the steering wheel to turn the feature on or off (above your left knee as described already).
Also when you have the TCS on No light should be on in the dash. When you turn the system off there will however be a light confirming TCS OFF .... as far as I can tell TCS will do its job in the background when required.
Accrording to the manual when TCS actually kicks in under heavy acceleration the Slip light will flash indicating that the car may slip .... I suppose thats the only evidence of the TCS operating you'll see in the instrument panel.
One good way to check to see if its the globe or the light thats faulty is to check it when you are turning the car on ... as the car is turned on BOTH the TCS OFF light as well as the SLIP light should come on in the dash, after the car has started and if the system is working properly both lights should then go off. If either the TCS OFF light or SLIP light stay on afer starting the car this indictaes a fault in the system ... thats when you need to get it repaired.
Hope that helps
