Initial Inspection and Diagnostic Overview

1. Check the IPC/BFC ACC and IPC/HVAC BATT Fuses by visual inspection.
2. Check for Diagnostic Trouble Codes (DTCs). Refer to Engine Controls and Computer System Diagnosis. Computers and Control Systems
3. If left or right turn signal indicator is inoperative, refer to Exterior Lights. Testing and Inspection
4. If Instrument Panel illumination lamps are inoperative, refer to Interior Lights Dimming. Testing and Inspection
5. Refer to Engine Controls for Service Engine Soon Indicator diagnosis. Computers and Control Systems
6. Refer to Supplemental Inflatable Restraint for Air Bag Indicator diagnosis. Air Bag Systems
7. Refer to Data Line Communications in Computer System Diagnosis for loss of Serial Data on SPI Bus between Body Function Controller (BFC) and Instrument Cluster. Computers and Control Systems
8. Refer to Driver Warning System in Computer System Diagnosis for the following indicators and/or gauges: Computers and Control Systems
^ ABS Indicator
^ BRAKE Indicator
^ CHECK OIL Indicator
^ Coolant Temperature Gauge
^ Coolant Temperature Indicator
^ CRUISE Indicator
^ Door Ajar Indicator
^ Fuel Gauge
^ High Beam Indicator
^ Low Coolant Indicator
^ LOW WASH Indicator
^ Oil Pressure Indicator
^ PRNDL Display
^ SERVICE VEHICLE SOON Indicator
^ Seat Belt Indicator
^ THEFT SYSTEM Indicator
^ Volts Indicator
^ 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 (Refer to Troubleshooting Procedures).
^ Check for proper installation of aftermarket electronic equipment which may effect the integrity of other systems (Refer to Troubleshooting Procedures). Diagnostic Aids
^ Air Bag indicator lights continuously with no loss of serial data. Use scan tool to monitor Sensing and Diagnosis Module (SDM). If the SDM is commanding the SIR indicator is ON, then refer to Supplemental Inflatable Restraint for diagnosis. If the SDM is commanding the SIR indicator is OFF, replace the Instrument Cluster. Air Bag Systems