Retrieve/Clear Continuous DTC's

1. If the concern remains after the visual inspection, connect a scan tool to the Data Link Connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the scan tool menu. If the vehicle selection cannot be entered:
^ check that the program card is correctly installed.
^ check the connections to the vehicle.
^ check the ignition switch position.
2. If the scan tool still does not allow the vehicle selection to be entered, refer to scan tool manual.
3. Perform the DATA LINK DIAGNOSTIC TEST using the scan tool. If the scan tool responds with:
^ CKT 914 and CKT 915 = ALL MODULE NO RESPONSE/NOT EQUIPPED, go to Module Communications Network (Information Bus) to diagnose the network communication concern.
^ If the Powertrain Control Module (PCM) is not listed for a communication concern, turn the A/C controls off and execute self-test diagnostics for the PCM.
^ If equipped with the Electronic Automatic Temperature Control (EATC), and the EATC module is not listed for a communication concern, execute self-test diagnostics for the EATC module.
4. If any PCM or EATC Diagnostic Trouble Codes (DTCs) are retrieved, and are related to the concern, go to the PCM DTC Index or the EATC Module DTC Index to continue diagnostics. Powertrain Control Module Diagnostic Trouble Code (DTC) Index or Electronic Automatic Temperature Control (EATC) Module Diagnostic Trouble Code (DTC) Index
5. If no DTCs related to the concern are retrieved, go to the Symptom Chart to continue diagnostics. Symptom Related Diagnostic Procedures
6. If the EATC module cannot be accessed by the scan tool, go to Pinpoint Test E. Test E: No Communication With the Electronic Automatic Temperature Control Module