The only way to check is to plug your car's computer to the scanner which are avalable at the auto parts store. AUTO ZONE does it for free.
Trouble code P0603 means:Internal control module,keep alive memory (KAM) error
Hold in the off and warmer buttons on your air conditioning.. and it will throw up error codes on the LCD panel that shows how much gas you have.
With a scan tool.
With a scan tool.
With a scan tool.
With a scan tool
it could be so many diffrent things google "error codes for a 1994 fleetwood brougham" it will send you to myweb.accesuss.com or .net..very usefull in tracking down the cause
If usb is in, check devices in your comp for error codes.
Pretty simple connect an obd2 scanner and it will pull the error codes for the check engine light then look up the error code and diagnose and fix your problem
Go to an auto parts store and ask them to run a scan. It's free and they check the codes with a special scan tool
push the AC and heater buttons in at the same time and hold for 6 seconds
With a scan tool.With a scan tool.