Hvac Diagnostic Codes

[isiginamo]

I think this is just a method of checking HVAC system... but this is what my car did.

It displayed a number 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, then back to 20... over and over and over.

And that is all?

Does it mean anything?

Thanks alot! Happy Halloween

[gordonw]

20 is for the solar sensor circuit. 21,22,23,24 is for the ABS actuator solenoid circuit. No clue on the other codes.

[wwest]

I think this is just a method of checking HVAC system... but this is what my car did.

It displayed a number 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, then back to 20... over and over and over.

And that is all?

Does it mean anything?

Thanks alot! Happy Halloween

I have to shine a light, a BRIGHT one, on the solar radiation senor in order to get the system to "test" for codes beyond that one.