Initial Inspection and Diagnostic Overview

1. Check open LCD Fuse, A/C Fuse and CCM Fuse.
2. Make sure ground G106 is clean and tight.
3. Check for any malfunction codes being set.

^ Check for a broken (or partially broken) wire inside of the insulation which could cause system failure but prove "GOOD" in a continuity/voltage check.
^ Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems.