tcs - traction control system. If it's on constantly then there is an issue with the system that you will to have fixed. Sometimes if the car loses traction the TCS light will flash to let you know the system is kicking in to control the car.
I have a 2003 and my TCS light comes on and then stays on until I shut it off. I think there is a sensor problem on mine. I can drive it 400 miles before it might do it again. I have seen it flash in wet driving conditions. I bet it has some type of abs sensor controling this light. It has to tell the system some how when you loose traction. This is probably a common issue with these cars. My car has 130000 miles on it and is the V6 six speed EX accord coupe.
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