CCU electrical diagram?

[Tigger300E]

My climate control system only blows hot air through the vents. The problem is that the CCU doesn't control the monovalve. The monovalve is OK, but doesn't get a negative signal from the CCU through pin L9. I had to wire the monovalve directly to the negative clamp of the battery and obviously this causes only cold air to blow
I've traced the problem to a burned out element - number IC6 on the
intergrated circuit of the CCU - but I don't have any diagram so I don't know what this element is, other than that it's a 16-pin element. could you tell me what this element is? anything to help me identify a replacement part? the CCU number is 124 830 02 85.