Troubleshooting Hints

PERFORM BEFORE BEGINNING SYSTEM DIAGNOSIS
WARNING: The SIR driver deployment loop (CKT 347 and 348) passes through connector C200. You must take special precautions before servicing connector C200. Disable the SIR system before you disconnect, probe, or Service connector C200. Refer to "Disabling the SIR System" In Air Bag and Seat Belts. Failure to follow the correct procedure could cause air bag deployment, personal Injury, or unnecessary SIR system repairs.

SERIAL DATA LINE (UART)
1. If all components are not accessible with a scan tool, check for an open in CKT 800 between DLC terminal "9" and 527" or short to BATT or Ground.
2. If a single component is not accessible with a scan tool, check for an open m CKT 800. If the wire is OK, refer to Powertrain Control Module diagnosis, Antilock Brake System for ABS diagnosis, and to Air Bags and Seat Belts for Supplemental Air Restraint diagnosis, and Instrument Panel for Instrument Cluster diagnosis.
Computers and Control Systems
Antilock Brakes / Traction Control Systems
Air Bag Systems
Instrument Panel, Gauges and Warning Indicators
SERIAL DATA LINE (CLASS 2)
1. If PCM is not accessible with a scan tool, check for an open in CKT 1807. If the wire is OK, refer to Powertrain Control Module Diagnosis.
^ 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 (See Diagnostic Aids for General Troubleshooting Procedures). Diagnostic Aids
^ Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems (See Diagnostic Aids for General Troubleshooting Procedures). Diagnostic Aids