Diagnostic Aids
WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
In order to determine whether an improper voltage level exists on the output circuit, the PCM compares the voltage level to the commanded state.
If the condition is intermittent, refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS .