HVAC Pre-Diagnostic Troubleshooting Procedure

HVAC Pre-Diagnostic Troubleshooting Procedure

For a complete wiring diagram, refer to.

Perform the following steps prior to any diagnostic procedure(s).

• Testing should only be performed with the battery fully charged to avoid false diagnosis.

• With the scan tool, read Powertrain Control Module (PCM) Diagnostic Trouble Codes (DTCs).

• Depending on the vehicle configuration, with the scan tool, read Totally Integrated Power Module (TIPM) DTCs.

• With the scan tool, read HVAC DTCs. Record all Stored, Active, and Pending DTC information.

• With the scan tool, read the Environmental Data. Use this data to help identify the conditions in which the DTC was set.

• Refer to the When Monitored and Set Conditions for this DTC. DTCs can set at ignition on, at start up, or operating under specific conditions.

• Using the wiring diagram as a guide, inspect the wiring and connectors related to this circuit and clean/repair as necessary.

• Check for controller software updates if applicable. Some conditions can be corrected by upgrading the controller software.

• If the controller is updated with new software, with the scan tool, perform a HVAC Actuator Calibration Test.

• Check for Service Information Tune-ups or Service Bulletins for any possible causes that may apply.

Did any of the above procedures repair the vehicle?

Yes

• Testing is complete.

• Perform the HVAC Verification Test. Refer to => [ HVAC Verification Test ] HVAC Verification Test.

No

• Perform the appropriate diagnostic procedure.