^^ Exactly

The earlier one you pull up the passenger side carpet, turn the key to the 'ON' position without starting the car and look at the LED light under the carpet

One blink is ok

Long blink = 10
Short blink = 1
Long pause = another code
It will keep throwing codes over and over and over again.... So keep writing them down until you see a pattern

Newer one is more of the same, bring that connection and the codes will come through the CEL on the dashboard

Write them all down and come back here

Example

LONG LONG SHORT SHORT = 22
LONG LONG LONG SHORT ... LONG LONG SHOT = 31 and 21
etc etc