Wire color code standards are unique to the manufacturer. Here are a few correlations regarding USA built, GM vehicles:
red = unfused battery (B+)
orange = fused battery (B+)
pink with black stripe = fused ignition (I+)
black = ground (B-)
All other colors are a mixed bag of switched power and switched ground with limited correlations within specific groups of circuitry (e.g., lighting circuits, instrument circuits, radio, starter, etc).