Diagnostic Test

CHECK IF DTC IS ACTIVE
1. Ignition on, engine running.
2. Using the HVAC controls, switch to full hot and full cold and then back again.
3. With the scan tool, read HVAC DTCs.
  Is this DTC active?
  
  Yes
  - Go To 2
  No
  - Go To 7
CHECK THE (C26) 5 VOLT SUPPLY CIRCUIT FOR AN OPEN

Fig 1: Checking 5 Volt Supply Circuit For An Open
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off to the lock position.
2. Disconnect the A/C Heater Control harness connector.
3. Disconnect the Blend Door Actuator harness connector.
4. Measure the resistance of the (C26) 5 Volt Supply circuit between the A/C Heater Control harness connector and the Blend Door Actuator harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 3
  No
  - Repair the (C26) 5 Volt Supply circuit for a short to ground.
  - Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
CHECK THE (C26) 5 VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND

Fig 2: Checking 5 Volt Supply Circuit For A Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between ground and the (C26) 5 Volt Supply circuit.
  Is the resistance below 100k Ohms?
  
  Yes
  - Repair the (C26) 5 Volt Supply circuit for a short to ground.
  - Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (C36) BLEND DOOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

Fig 3: Checking Blend Door Signal Circuit For A Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between ground and the (C36) Blend Door Signal circuit.
  Is the resistance below 100k Ohms?
  
  Yes
  - Repair the (C36) Blend Door Signal circuit for a short to ground.
  - Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  No
  - Go To 5
CHECK THE (C36) BLEND DOOR SIGNAL CIRCUIT FOR A SHORT TO THE (C121) SENSOR GROUND CIRCUIT

Fig 4: Checking Blend Door Signal Circuit For A Short To Sensor Ground Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between (C36) Blend Door Signal circuit and the (C121) Sensor Ground circuit.
  Is the resistance below 100k Ohms?
  
  Yes
  - Repair the (C36) Blend Door Signal circuit for a short to the (C121) Sensor Ground circuit.
  - Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  No
  - Go To 6
CHECK THE BLEND DOOR ACTUATOR
1. Turn the ignition off to the lock position.
2. Replace the Blend Door Actuator in accordance with the Service Information. Refer to ACTUATOR, BLEND DOOR, REMOVAL .
3. Reconnect all previously disconnected connectors.
4. Ignition on, engine not running.
5. Using the scan tool, erase HVAC DTCs.
6. Using the scan tool, perform the HVAC Actuator Calibration Test.
7. Turn the ignition off to the lock position for 30 seconds.
8. Ignition on, engine running.
9. Using the HVAC controls, switch to full hot and full cold and then back again.
10. With the scan tool, read HVAC DTCs.
  Did 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.
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.