Electronic Climate Control

1. Verify the customer's concern by operating the electronic automatic temperature control to duplicate the condition.
2. Inspect to determine if one of the following mechanical or electrical concerns apply:

VISUAL INSPECTION CHART

Mechanical Electrical
Vacuum hose damaged. Open fuse(s).
A/C system damaged. Circuitry misrouted/damaged.
Damaged drive bell. Connectors damaged/disconnected.

3. If inspection reveals an obvious concern that is readily serviced, correct the concern before continuing with Inspection and Verification.
4. If a concern remains after the inspection, use the Rotunda New Generation Star (NGS) Tester 007-00500 connected to the Data Link Connector (DLC) to retrieve continuous Diagnostic Trouble Codes (DTCs) and to execute Self Test Diagnostics for the Electronic Automatic Temperature Control Module, see Powertrain Management/Testing and Inspection/Procedures/On Board Diagnostics.
5. If self test is passed and no DTCs are retrieved, go to the Symptom Chart to continue diagnostics. Electronic Climate Control
6. If DTCs are retrieved, go to the EATC System On-Board Diagnostic Trouble Code to continue diagnostics.
7. If the electronic automatic temperature control module cannot be accessed by the NGS Tester, go to Pinpoint Test E. E: No Communication With EATC Module
^ The EATC On-Board Diagnostic will detect concerns in the system control functions found during the On-Board Diagnostic and will display DTCs and intermittent DTCs for concerns occuring during system operation. The vehicle interior temperature should be between 16°C (60°F) and 27°C (80°F) when performing the On-Board Diagnostic. If the temperatures are not within the specified ranges, false in-car temperature sensor error codes will be displayed. Record all error codes displayed during the test.
^ If any DTCs appear during the On-Board Diagnostic, follow the diagnostics procedure given under ACTION for each DTC given.
^ If a condition exists but no DTCs appear during the On-Board Diagnostic, see Symptom Chart Condition: EATC/SATC System Inoperative, Intermittent or Improper Operation. Electronic Climate Control
^ The On-Board Diagnostic can be initiated at any time with any resulting DTCs displayed. Normal operation of the system stops when the On-Board Diagnostic is activated.
^ To enter the On-Board Diagnostic, press the OFF and FLOOR buttons simultaneously and then press the AUTOMATIC button within two seconds. The display will show a pulse tracer going around the center of the display window. The test may run as long as 30 seconds.
^ To exit On-Board Diagnostic and retain DTCs, push the blue (cooler) button. The control will exit On-Board Diagnostic, retain all DTCs and then turn OFF (display blank).
^ To exit On-Board Diagnostic and clear all DTCs, press Defrost button. The vacuum fluorescent display window will show 000 and all function symbols for one second. Then, the EATC Control will turn OFF (display blank) and all DTCs will be cleared.

The On-Board Diagnostic should be deactivated before powering the system down (system turned OFF). Intermittent DTCs will be deleted after 80 ignition switch ON cycles (after the intermittent condition occurs).