Initial Inspection and Diagnostic Overview

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

Visual Inspection Chart:

2. Inspect to determine if one of the mechanical or electrical concerns apply.
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 the inspection reveals obvious concern(s) that can be readily identified, repair as required.
5. If the concern remains after the inspection, connect the 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.

If the scan tool still does not allow with the vehicle selection to be entered, refer to the scan tool manual.

6. Carry out the DATA LINK DIAGNOSTIC TEST using the scan tool. If the scan tool responds with:
- CKT914 and CKT915 = ALL MODULE NO RESPONSE/NOT EQUIPPED, go to Module Communications Network (Information Bus) to diagnose the communications network concern.
- If the Powertrain Control Module (PCM) is not listed for a communication concern, turn the A/C controls to OFF and carry out the self-test diagnostics for the PCM.
- If the Remote Climate Control (RCC) module is not listed for a communication concern on vehicles equipped with EATC, carry out the Remote Climate Control Module Self-Test. Reading and Clearing Diagnostic Trouble Codes

7. If any PCM or RCC module Diagnostic Trouble Codes (DTCs) are retrieved and related to the concern, go to the POWERTRAIN CONTROL MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX or the REMOTE CLIMATE CONTROL MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX to continue diagnostics. Powertrain Control Module Diagnostic Trouble Code (DTC) Index Remote Climate Control Module Diagnostic Trouble Code Index
8. If no DTCs related to the concern are retrieved, go to the SYMPTOM CHART to continue the diagnostics. Symptom Related Diagnostic Procedures
9. If the RCC module cannot be accessed by the scan tool, go to Pinpoint Test I. Test I: Incorrect Direction Of Air Flow From Outlet - EATC