Initial Inspection and Diagnostic Overview
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CLIMATE CONTROL SYSTEM INSPECTION AND VERIFICATION - HYBRID
Inspection and Verification
NOTE:Verify the service disconnect plug is correctly inserted and in the LOCK position.
1. Verify the customer concern.
2. Visually inspect for obvious signs of mechanical or electrical damage. Visual Inspection Chart
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. If the cause is not visually evident, connect the scan tool to the data link connector (DLC).
NOTE:Make sure to use the latest scan tool software release.
5. If the scan tool does not communicate with the VCM:
- check the VCM connection to the vehicle.
- check the scan tool connection to the VCM.
- see Pinpoint Test 17: No Power To The Scan Tool, to diagnose no power to the scan tool.
NOTE:The vehicle communication module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM.
6. If the scan tool does not communicate with the vehicle:
- verify the ignition key is in the ON position.
- verify the scan tool operation with a known good vehicle.
- see - Communications Network - Troubleshooting, to diagnose no response from the DATC module, PCM or traction battery control module (TBCM).
7. Carry out the network test.
- If the scan tool responds with no communication from one or more modules, see - Communications Network - Troubleshooting.
- If the network test passes, retrieve and record the continuous memory DTCs.
8. Clear the continuous DTCs and carry out the self-test diagnostics from the DATC module, PCM, or TBCM.
NOTE:Some PCM DTCs may inhibit A/C operation. If any PCM DTCs are retrieved, diagnose those first. See - PCM - DTC Index.
9. If the DATC module DTCs retrieved are related to the concern, see - Dual Automatic Temperature Control (DATC) Module - DTC Chart. If the TBCM DTCs retrieved are related to the concern, see - Traction Battery Control Module (TBCM) - DTC Chart. For all other DTCs, see - Control Systems - B, C And U Codes - DTC Chart.
10. If no DTCs related to the concern are retrieved, see -- Symptom Troubleshooting Chart - Climate Control.
DATC Module - Diagnostic Methods
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 DATC Module On-Demand Self Test. To retrieve and/or clear continuous DTCs, carry out the DATC Module - Retrieve Continuous DTCs procedure. Always carry out the DATC Module On-Demand Self Test before retrieving continuous DTCs.If no DTCs are present, see -- Symptom Troubleshooting Chart - Climate Control for the appropriate diagnostic action.
DATC Module - On-Demand Self Test
The DATC 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 DATC Module On-Demand Self Test. Make sure to retrieve continuous DTCs by carrying out the DATC Module - Retrieve Continuous DTCs procedure before clearing any continuous DTCs.
- The DATC 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 DATC 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°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 POWER and DEFROST buttons simultaneously and release, then press the FLOOR/DEFROST 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 DATC 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. See - Dual Automatic Temperature Control (DATC) Module - DTC Chart and follow the ACTION for each DTC given.
- If a condition exists, but no DTCs appear during the self-test, Condition: The DATC System is Inoperative, Intermittent or Incorrect Operation.
- To exit the self-test and retain all DTCs, press any button except DEFROST. The DATC module will exit the self-test and retain all DTCs.
- To exit the self-test and clear all DTCs, press the DEFROST button. The DATC 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 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.
DATC Module - Retrieve Continuous DTCs
The DATC module 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 POWER and DEFROST buttons simultaneously and release, then press the PANEL 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 DATC module display. Record all DTCs displayed.
- If any DTCs appear during the self-test, carry out the diagnostic procedure. See - Dual Automatic Temperature Control (DATC) Module - DTC Chart and follow the ACTION for each DTC given.
- If a condition exists but no DTCs appear,.
- To exit and retain all continuous DTCs, press any button except DEFROST. The DATC module will exit the retrieved continuous DTCs mode and retain all continuous DTCs.
- To exit and clear all continuous DTCs, press the DEFROST button. The DATC module will exit the retrieve continuous DTCs mode 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.
DATC Module - Cold Boot Process
The purpose of the cold boot process is to allow the DATC module to reinitialize and calibrate the actuators. To carry out the cold boot process, follow the steps below.
- Turn the ignition switch to the OFF position.
- Disconnect the DATC module electrical connectors.
- Wait one minute.
- Connect the DATC module electrical connectors.
- Turn the ignition switch to the ON position.
- Select any position except OFF on the DATC module.
The DATC module will now initialize and calibrate the actuators.