Inspection and Verification

INSPECTION AND VERIFICATION

1. Verify the customer concern by operating the climate control system to duplicate the condition.

Visual Inspection Chart:

2. Visually inspect for obvious signs of mechanical or electrical damage.
3. As pinpoint tests and measurements are being carried out, be sure to inspect for any disconnected, loose-fitting, or incorrectly installed component, module and in-line electrical connectors and pins.
4. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
5. If the cause is not visually evident, connect a diagnostic tool to the data link connector and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
- check that the program card is correctly installed.
- check the connections to the vehicle.
- check the ignition switch position.

6. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
7. Carry out the DATA LINK DIAGNOSTICS test. If the diagnostic tool responds with:
- CKT 914, CKT 915, or CKT 70 = ALL ECUS NO RESP/NOT EQUIP, refer to Module Communications Network (Information Bus) to diagnose the network concern.
- If the powertrain control module (PCM) is not listed for a communication concern, turn the A/C controls to OFF and execute the self-test diagnostics for the PCM.
- If the DATC/EATC module is not listed for a communication concern, execute self-test diagnostics for the DATC/EATC module. Dual Automatic Temperature Control Module Self-Test

8. If any PCM or DATC/EATC DTCs are retrieved, and are related to the concern, go to the Powertrain Control Module Diagnostic Trouble Code (DTC) Index or the Electronic Automatic Temperature Control (DATC/EATC) Module Diagnostic Trouble Code (DTC) Index to continue diagnostics. Diagnostic Trouble Code Tests and Associated Procedures
9. If no DTCs related to the concern are retrieved. GO to Symptom Chart to continue diagnostics. Symptom Related Diagnostic Procedures
10. If the DATC/EATC module cannot be accessed by the diagnostic tool, GO to Pinpoint Test G. Test G