Diagnostic Test

WARNING: This page is about a different car, the 2016 Dodge Durango. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
1. With the scan tool, read HVACR DTCs and record on the repair order.
2. Record the Environmental Data.
3. With the scan tool, erase DTCs.
4. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
5. With the scan tool, read HVACR DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
CHECK THE (C257) BLOWER MOTOR FEED CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off to the lock position.
2. Disconnect the HVACR Module harness connector.
3. Disconnect the Blower Motor Power Module harness connector.
4. Measure the resistance between ground and the (C257) Blower Motor Feed circuit.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Repair the (C257) Blower Motor Feed circuit for a short to ground.
  - Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (C256) BLOWER MOTOR RETURN SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. Measure the resistance between ground and the (C256) Blower Motor Return Signal circuit.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Repair the (C256) Blower Motor Return Signal circuit for a short to ground.
  - Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  No
  - Go To 4
CHECK THE BLOWER MOTOR POWER MODULE
1. Turn the ignition off to the lock position.
2. Replace the Blower Motor Power Module in accordance to the Service Information. Refer to MODULE, POWER, BLOWER MOTOR, REMOVAL .
3. Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  Did this DTC reset performing the HVAC Verification Test?
  
  Yes
  - Go To 5
  No
  - Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  - Test complete.
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all HVACR Module harness connectors.
2. Disconnect all related in-line harness connections (if equipped).
3. Disconnect the related component harness connectors.
4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
  - Proper connector installation.
  - Damaged connector locks.
  - Corrosion.
  - Other signs of water intrusion.
  - Weather seal damage (if equipped).
  - Bent terminals.
  - Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
  - Terminals that have been pushed back into the connector cavity.
  - Perform a terminal drag test on each connector terminal to verify proper terminal tension.
  Repair any conditions that are found.
5. Reconnect all HVACR Module harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. With the scan tool, erase DTCs.
9. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
10. With the scan tool, read HVACR Module DTCs.
  Did the DTC return?
  
  Yes
  - Replace the HVACR Module in accordance with the Service information. Refer to MODULE, HVAC, REMOVAL .
  - Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  No
  - Perform the HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  - Test complete.