This harness is required when using the 99-7864 kit in a vehicle which has dual zone climate control from the factory. It will convert the dual zone to a single zone system.
Controller and Harness for GM "D" & "AD" 4 Pin Alternators (1995 to 2008), Blue Display
GM Data Interface 2006-2012 - REPLACED THE AX-GMLAN11
GM Data Interface 2006-2012 Wire Harness to Connect an Aftermarket Stereo Receiver - REPLACED BY AXDI-GMLN11
Kia/Hyundai 2005 And Up
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