You don't. Just and fluid and it will go off.
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It means there is a problem with the Anti-Lock Brake System. Check the fluid level in the Master cylinder. If the fluid level is ok, then take it to a professional for repair. you can also reset it by turning over and on the ingintion swith three times
I think you are assuming that to reset the check engine light you can just disconnect the battery. Disconnecting the battery on a 2004 OBD2 compliant vehicle will not reset the check engine light. It must be reset with an OBD2 scan tool. This would work on OBD1 vehicle but not on OBD2 vehicles. So the radio issue is mute. Have the problem that set the check engine light repaired and then reset the light with the tool. Reset the light without correcting the problem and the light will just come back on.
Fix the problem and the light will reset itself after a certain number of drive cycles.
This is a reminder light to tell you to remove the pellets from the catalytic converter, clean them, and put them back in. Yes, there is a reset button. You can safely ignore this light.
You do not reset it, it is a fault code. It is not a routine maintenance indicator. Fix the problem and the light will go out.