BCM means Body Computer Module and controls the functions of the body.
ECM means Engine Computer Module and controls the functions of the engine.
IPC means Instrument Panel Cluster.

• With the key on, engine running or not, go the climate screen on the CRT and press and hold the OFF and WARM buttons at the same time.
   
• The service engine soon lamp will light and the ECM codes will be listed followed by the BCM codes and then the IPC codes.
   
• They go by quite fast so you may want to write them down. Any code with a "h" after it will be a code that was current, but is not now, and is listed a "history" code. Any code that does not have an "h" is a current code.
   
• ECM codes will start with a "e" and then 3 digits, BCM with a "b" etc.
   
• After the codes are listed the screen will say ECM? This means do you want to diagnose the ECM.
   
• If there were "e" codes push "yes" if not, push "no" and the screen will go to the BCM?
   
• If there are ECM codes after pushing "yes" it will ask several questions.
   
• Keep pushing "no" until the question "ECM code reset" comes up and then push "yes".
   
• You can go from the ECM to the BCM and then to the IPC and clear any codes.
   
• You can't hurt anything by doing this procedure and even if you make a mistake simply push "end" or shut off the key and everything will go back to normal.