No Response From Sentry Key Immobilizer Module

SYMPTOM
NO RESPONSE FROM SENTRY KEY IMMOBILIZER MODULE

POSSIBLE CAUSES
- CCD bus (+) CKT to SKIM open
- CCD bus (-) CKT to SKIM open
- Fused B (+) circuit to SKIM open
- Fused ignition switch output CKT to SKIM open
- SKIM does not communicate
- SKIM ground circuit open