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Diagnostic Procedures
- Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC SYSTEM CHECK . After performing OBD system check, go to next step.
- Turn ignition on, with engine off. Using scan tool, attempt to display ABS data. If ABS data can be displayed, diagnose ABS system. See appropriate ANTI-LOCK article in BRAKES. If ABS data cannot be displayed, diagnose Class II serial data circuit. See BODY CONTROL MODULES article in appropriate ACCESSORIES & EQUIPMENT.