Just an FYI. I performed this procedure today and it worked for me. I cobbled together the multiple fixes that I found some months ago on "ricksfreeautorepairadvice.com". The web site apparently no longer exists.
Symptoms:

The Warning Triangle with an exclamation mark stays on as soon as I start the engine. Shortly after starting to drive, the TCS light comes-on, too. Both stay on. I took it to Pep Boys and they told me the code (84), but had no clue how to address the issue.
Note: In some blogs, I find people use the terms "TSA", "VSA" =Traction Stability Assist, and Vehicle Stability Assist, synonymous with TCS. I understand these terms are real in later model Honda's, where the original and older TCS "Traction Control System" is enhanced to become TSA or VSA - which is apparently a graduated computer-controlled system that originally started at the front two wheels (TCS) and eventually to all four wheels (VSA or TSA) to better control the stability of the car ( I read this is done through detecting wheel slip and automatically applying brakes to the wheel that is slipping).

History: the car was sitting in my garage for nine months w/o a battery because I was fixing the driver’s door and re-finishing some exterior surfaces. Before I put the car in the garage, I did not observe these symptoms.

Fix: The "TCS Neutral Position Setting" was apparently not set or needed to be re-set. You need access to the OBDII terminal to jump sockets 4 and 9. I used two sewing stick-pins and a double-ended alligator clip to jump them (in the procedure, below). The sockets 1, 8, 9 and 16 are labeled, but EXTREMELY difficult to see. The OBDII terminal has two rows of 8 sockets. The labels with the socket numbers are adjacent to the first and last sockets in each row. My OBDII terminal is located just underneath and to the far left of the driver's lower dash fascia (a cover with the TCS switch mounted). You don't have to remove the fascia to do this procedure.

Make sure you have full brake fluid.

Do all steps with doors closed.

Verify the TCS control system is "engaged". With engine running, you can look at your dash lights and the TCS light will not be on. You can push the TCS switch to see the light come on, which means the TCS system is dis-engaged. Push it again to 'engage' the TCS system and the light will extinguish.

Verify the ABS code “84” reading.

1. Doors closed.
   
2. Jump pins 4 and 9.
   
3. Turn on the ignition.
   
4. Watch the ABS light:
   1. It will blink 8 times slowly.
      
   2. Then, it will blink 4 times more quickly.
      
5. Turn-off ignition
   

Clear the ABS codes.

1. Doors closed.
   
2. Jump pins 4 and 9.
   
3. Press and hold down the brake pedal.
   
4. Turn on ignition.
   
5. Watch for the ABS light to turn-off.
   
6. Release brake pedal.
   
7. Watch for the ABS light to turn-on.
   
8. Press and hold down the brake pedal.
   
9. Watch for the ABS light to turn-off.
   
10. Release the brake pedal.
    
11. Watch for the ABS light to blink two times (2X). The codes are now cleared.
    

Re-set the TCS neutral position.

1. Doors closed.
   
2. Jump pins 4 and 9.
   
3. Turn on the ignition and observe and perform the following:
   1. The ABS light should turn-on, then after two (2) seconds, it should turn-off.
      
   2. Within two seconds, push the TCS switch (off, meaning traction control is disengaged).
      
   3. The ABS light should turn-on.
      
   4. Within two seconds, push the TCS switch (on, meaning ‘engaged’).
      
   5. Observe all lights should turn-off: The ABS, the Warning Triangle, and the TCS.
      
4. Remove the jumper from pins 4 to 9.

I was done.