Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 RAM 2500 HD. 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 DTCs.
  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
1. Turn the ignition off to the lock position.
2. Disconnect the Blower Motor Power Module C1 harness connector.
3. Disconnect the A/C Heater Control C1 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 the HVAC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 3
CHECK THE (C56) BLOWER CONTROL CIRCUIT FOR AN OPEN
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 Motor Power Module harness connector.
  Is the resistance above 100k Ohms?
  
  Yes
  - Repair the (C56) Blower Control circuit for an open.
  - Perform the HVAC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 4
CHECK THE (Z911) GROUND CIRCUIT FOR AN OPEN
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 (Z911) Ground circuit for an open.
  - Perform the HVAC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 5
CHECK THE BLOWER MOTOR POWER MODULE
1. Turn the ignition off to the lock position.
2. Replace the Blower Motor Power Module in accordance with the Service Information. Refer to MODULE, POWER, BLOWER MOTOR, REMOVAL .
3. Perform the HVAC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  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. Refer to CONTROL, A/C AND HEATER, REMOVAL .
  - Perform the HVAC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  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 STANDARD PROCEDURE .
  No
  - Test complete.