Alternate Diagnostic Methods - HVAC Module - Dual Automatic Temperature Control (DATC) Only

Climate Control System

Alternate Diagnostic Methods - HVAC Module - Dual Automatic Temperature Control (DATC) Only

The DATC system must be diagnosed by first retrieving any DTCs, if present.

- An on-demand (hard fault) DTC indicates that the fault is currently present. An on-demand DTC suggests a wiring fault, disconnected connector or component failure.
- A continuous (intermittent) DTC alone (corresponding on-demand DTC is not present) indicates that the fault is an intermittent condition and may not be currently present. A continuous only DTC suggests a poor wiring connection, loose pin or terminal, or intermittent component failure.

On-demand (hard fault) or continuous (intermittent fault) DTCs can be retrieved using a scan tool. If using a scan tool, refer to the scan tool operating manual.

On-demand DTCs can also be retrieved by carrying out the HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test. To retrieve and/or clear continuous DTCs, carry out the HVAC Module - Dual Automatic Temperature Control (DATC) - Retrieve Continuous DTCs procedure. Always retrieve both on-demand and continuous DTCs before proceeding with diagnosis and/or repair.

If no DTCs are present, GO to Symptom Chart - Climate Control Systems or GO to Symptom Chart - NVH for the appropriate diagnostic action. Symptom Chart - Climate Control Systems Symptom Chart - NVH


HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test

The HVAC Module - Dual Automatic Temperature Control (DATC) 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 HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test. Make sure to retrieve continuous DTCs by carrying out the HVAC Module - Retrieve Continuous DTCs procedure before clearing any continuous DTCs.

- The HVAC Module - Dual Automatic Temperature Control (DATC) 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 HVAC Module - Dual Automatic Temperature Control (DATC) 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°C-38°C (40°F-100°F) when carrying out the self test. 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 HVAC module - DATC 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 HVAC Module DTC Chart and follow the ACTION for each DTC given.
- If a condition exists, but no DTCs appear during the self test, GO to Symptom Chart - Climate Control Systems. Symptom Chart - Climate Control Systems
- To exit the self test and retain all DTCs, press any button except DEFROST. The HVAC module - DATC will exit the self test and retain all DTCs.
- Always exit the self test before powering the system down (system turned OFF). Once the self test 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 occurs.
- If a condition exists, but no on-demand DTCs appear during the self test, carry out the HVAC Module - Dual Automatic Temperature Control (DATC) - Retrieve Continuous DTCs self test.


HVAC Module - Dual Automatic Temperature Control (DATC) - Retrieve Continuous DTCs

The HVAC module - DATC will retrieve only continuous (intermittent) DTCs when carrying out this procedure.

- Retrieval of continuous DTCs can be initiated after cycling the ignition switch from OFF to ON. Normal operation of the climate control system stops when retrieving continuous DTCs.
- To retrieve continuous DTCs, press the OFF and DEFROST buttons simultaneously and release, then press the RECIRC button within 2 seconds. All vacuum fluorescent segments will be displayed if there are no continuous DTCs present. Continuous DTCs are indicated by the presence of the Celsius symbol (°C) on the HVAC module - DATC display. Record all DTCs displayed.
- If any DTCs appear, carry out the diagnostic procedure. Refer to the HVAC Module DTC Chart and follow the ACTION for each DTC given.
- If a condition exists but no DTCs appear, GO to Symptom Chart - Climate Control Systems. Symptom Chart - Climate Control Systems
- To exit and retain all continuous DTCs, press any button except DEFROST. The HVAC module - DATC will exit and retain all continuous DTCs.
- To exit and clear all continuous DTCs, press the DEFROST button. The HVAC module - DATC will exit and all continuous DTCs will be cleared.
- Always exit the procedure before powering the system down (system turned OFF). Once the procedure 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 occurs.