You cAN TRY THIS SELF TEST, IF IT WORKS POST ALL CODES SHOWN AND I WILL LOOK IT UP.
Electronic Automatic Temperature Control Module On-Demand Self Test
The EATC Module On-Demand Self Test will retrieve on-demand (hard fault) DTCs only, it will not
retrieve continuous DTCs. Continuous DTCs can be cleared when exiting the EATC Module On-
Demand Self Test. Make sure to retrieve continuous DTCs by carrying out the Electronic Automatic
Temperature Control Module - Retrieve Continuous DTCs procedure before clearing any continuous
The EATC Module On-Demand Self Test will not detect concerns associated with data link
messages like engine coolant temperature or vehicle speed signals. A scan tool must be used to
retrieve these concerns.
The EATC Module On-Demand Self Test will detect concerns in the system control functions and
will display on-demand (hard fault) DTCs for concerns that are present during the self-test. The
vehicle interior temperature should be between 4 -38 C (40 -100 F) when carrying out the selftest.
If the temperatures are not within the specified ranges, false DTCs may be displayed.
The self-test can be initiated after cycling the ignition switch from OFF to ON. Normal operation
of the climate control system stops when the self-test is activated.
To enter the self-test, press the OFF and DEFROST buttons simultaneously and release, then press
the AUTO button within 2 seconds. The display will show a flashing blower icon for 20 seconds,
after which all vacuum fluorescent segments will be displayed if there are no on-demand DTCs
present. If DTCs are present, the EATC module will display "00 00" and then on-demand DTCs.
Record all DTCs displayed.
If any DTCs appear during the self-test, carry out the diagnostic procedure. Refer to the
ELECTRONIC AUTOMATIC TEMPERATURE CONTROL MODULE DIAGNOSTIC
TROUBLE CODE INDEX and follow the ACTION for each DTC given.
If a condition exists, but no DTCs appear during the self-test, GO to SYMPTOM TABLE
Condition: The EATC System Is Inoperative, Intermittent or Incorrect Operation.
To exit the self-test and retain all DTCs, press any button except DEFROST. The EATC module
will exit the self-test and retain all DTCs.
To exit the self-test and clear all DTCs, press the DEFROST button. The EATC module will exit
the self-test and all DTCs will be cleared.
Always exit the self-test before powering the system down (system turned OFF). Once the selftest
is exited, the ignition switch must remain ON for at least 30 seconds to allow the door
actuators to automatically recalibrate.
Continuous DTCs will be deleted after 80 ignition switch ON cycles after the intermittent fault
HVAC CONTROL SYSTEM - GENERAL INFORMATION & DIAGNOSTICS -2006.
Wednesday, March 7th, 2012 AT 7:28 PM