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DTC Troubleshooting

DTC TROUBLESHOOTING CHART

Step Action YES NO
1  Serial communication signal data check 
  1. Connect scan tool to DLC with ignition switch turned OFF.
  2. Start engine and select "DATA LIST" mode on scan tool.
  3. Check "Refrigerant Pressure", "Vehicle Speed", "Coolant Temp" and "Outside Air Temp" varies displayed on scan tool.

Is displayed each varies described varies in Scan Tool Data? 		 Intermittent trouble. Check for intermittent referring to INTERMITTENT AND POOR CONNECTION INSPECTION . Go to Step 2.
2  Serial communication signal check 
  1. Connect connectors to BCM and HVAC control module.
  2. Using oscilloscope, check that serial communication signal at "G30-5" is outputted referring to "VOLTAGE CHECK " of INSPECTION OF BCM AND ITS CIRCUITS .

Is serial communication signal outputted at "G30-5" terminal of BCM connector? 		 HVAC control module faulty. BCM (included in junction block assembly) faulty.
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