Diagnostic Test

WARNING: This page is about a different car, the 2012 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.

CHECK IF DTC IS ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, read HVAC DTC's.
  NOTE:
  It can take up to 30 seconds or more for this DTC to mature.
  
  Is this DTC active?
  
  Yes
  - Go To 2.
  No
  - Go To 6.
CHECK THE (C56) BLOWER CONTROL CIRCUIT FOR A SHORT TO GROUND

Fig 1: Checking Blower Control Circuit For A Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off to the lock position.
2. Disconnect the Blower Module harness connector.
3. Disconnect the A/C Heater Control harness connector.
4. Measure the resistance between ground and the (C56) Blower Control circuit.
  Is the resistance below 100k Ohms?
  
  Yes
  - Repair the (C56) Blower Control circuit for an short to ground.
  - Perform HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  No
  - Go To 3.
CHECK THE (C56) BLOWER CONTROL CIRCUIT FOR AN OPEN

Fig 2: Checking Blower Control Circuit For An Open
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off to the lock position.
2. Measure the resistance of the (C56) Blower Control circuit between the A/C Heater Control harness connector and the Blower Module harness connector.
  Is the resistance above 100k Ohms?
  
  Yes
  - Repair the (C56) Blower Control circuit for an open.
  - Perform HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  No
  - Go To 4.
CHECK THE (Z911) GROUND CIRCUIT FOR AN OPEN

Fig 3: Checking Ground Circuit For An Open
Courtesy of CHRYSLER GROUP, LLC
1. Using a 12-volt test light connected to 12-volts, check the (Z911) Ground circuit.
  NOTE:
  The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
  
  Does the test light illuminate brightly?
  
  Yes
  - Repair the (C56) Blower Control circuit for an open.
  - Perform HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  No
  - Go To 5.
CHECK THE BLOWER MODULE
1. Turn the ignition off to the lock position.
2. Replace the Blower Module in accordance with the Service Information.
3. Perform HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  Did the DTC reset during or after the HVAC Verification Test?
  
  Yes
  - Replace and program the A/C Heater Control in accordance with the Service Information.
  - Perform 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. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
3. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, partially broken wires.
4. Check the connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
5. Wiggle the wiring and connectors while checking for shorted and open circuits.
6. With the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  No
  - Test complete.