Decode how exactly? You can take your car to AutoZone and they check codes for free, then they can recommend or tell you what shops are in the area.
Disconnect (both) battery cables, wait 30 minutes, and re-connect battery cables.
You can easily get all of the color codes for every wire on the 1998 Pontiac Grand Prix. Pontiac has an official website homepage that has all the information on it.
with a scan tool
The Pontiac Grand Prix goes by the GM Factory Wire Harness Color Codes. http://www.installdr.com/harnesses/GM-Wiring.pdf
You can't manually get the check engine light to give you the trouble codes on your vehicle. 1995 and later vehicles use the OBDII system and you must use a scanner tool to retrieve the codes. You can go to AutoZone or similar auto parts store that offers free scans to get the trouble codes retrieved. Or you can buy your own scan tool for about $70.
The related link below gives the trouble codes for a 1995 grand voyager.
whats the dealers code to un lock the radio
The ABS light on a 2004 Pontiac Grand Am can be reset by connecting an OBDII code reader to the vehicle's computer. It can reset all codes and determine their cause.
it should, i do not think GM dealers have a separate scan tool for the Toyota, I mean Pontiac Vibe
You have to find the clues or pieces of the code.
Trouble code P0740 means: Torque Converter Clutch Solenoid Circuit
Assuming you want to read the DTC's (Diagnostic Trouble Codes) stored in your 97 Pontiac, your local auto parts store can read them (if any exists) for you at no cost. You can google the results you get for a definition of codes. Keep in mind the codes that come up may only be the result of another underlying problem.