Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

CHECK IF THE DTC IS ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, read HVAC DTCs.
  Is this DTC active?
  
  Yes
  - Go To 2
  No
  - Go To 7
CHECK THE (C134) PANEL DUCT TEMPERATURE SENSOR SIGNAL CIRCUIT VOLTAGE
1. Turn the ignition off to the lock position.
2. Disconnect the Panel Duct Temperature Sensor harness connector.
  NOTE:
  Due to the small terminal and pin size of the Panel Duct Temperature Sensor and harness connector, make sure to not damage the terminals in this process.
3. Ignition on, engine not running.
4. Measure the voltage between the (C134) Panel Duct Temperature Sensor Signal circuit and the (C121) Sensor Ground circuit in the Panel Duct Temperature Sensor harness connector.
  Is the voltage below 0.1 volt?
  
  Yes
  - Replace the Panel Duct Temperature Sensor in accordance with the Service Information. Refer to SENSOR, EVAPORATOR TEMPERATURE, REMOVAL .
  - Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (C134) PANEL DUCT TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off to the lock position.
2. Disconnect the jumper wire from the Panel Duct Temperature Sensor harness connector.
3. Disconnect the A/C Heater Control C1 harness connector.
4. Ignition on, engine not running.
5. Measure the voltage of the (C134) Panel Duct Temperature Sensor Signal circuit.
  Is there any voltage present?
  
  Yes
  - Repair the (C134) Panel Duct Temperature Sensor Signal circuit for a short to voltage.
  - Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (C134) PANEL DUCT TEMPERATURE SENSOR SIGNAL CIRCUIT FOR AN OPEN
1. Turn the ignition off to the lock position.
2. Measure the resistance of the (C134) Panel Duct Temperature Sensor Signal circuit between the A/C Heater Control C1 harness connector and the Panel Duct Temperature Sensor harness connector.
  Is the resistance above 1.0 Ohm?
  
  Yes
  - Repair the (C134) Panel Duct Temperature Sensor Signal circuit for an open or high resistance.
  - Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  No
  - Go To 5
CHECK THE (C121) SENSOR GROUND CIRCUIT FOR AN OPEN
1. Measure the resistance of the (C121) Sensor Ground circuit between the A/C Heater Control C1 harness connector and the Panel Duct Temperature Sensor harness connector.
  Is the resistance above 1.0 Ohm?
  
  Yes
  - Repair the (C121) Sensor Ground circuit for an open.
  - Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  No
  - Go To 6
CHECK THE PANEL DUCT TEMPERATURE SENSOR
1. Replace the Panel Duct Temperature Sensor in accordance with the Service Information. Refer to SENSOR, TEMPERATURE, AIR OUTLET, REMOVAL .
2. Ignition on, engine not running.
3. With the scan tool, erase HVAC DTCs.
4. Cycle the ignition off for 30 seconds then back on.
5. With the scan tool, read HVAC DTCs.
  Does this DTC reset?
  
  Yes
  - Replace and program the A/C Heater Control in accordance with the Service Information. Refer to CONTROL, A/C AND HEATER, REMOVAL .
  - Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  No
  - Test complete.
  - Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
CHECK THE WIRING AND CONNECTORS
1. The conditions necessary to set the DTC are not present at this time.
2. With the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set.
3. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
4. Wiggle the wiring and connectors while checking for shorted and open circuits.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  No
  - Test complete.