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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 909 ((Heating & Air Conditioning - Electrical Diagnostics - 2500 Hd & 3500 Hd)) >> Diagnosis And Testing >> B11FE-11-Variable A/C Compressor Control - Circuit Short To Ground >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK IF DTC IS ACTIVE 
    1. Ignition on, engine not running.
    2. Using the scan tool, read HVAC DTCs.

      Is this DTC active?

      Yes 

      • Go To  3

      No 

      • Go To  2
  2. PERFORM HVAC ACTUATOR CALIBRATION TEST 
    1. Using the scan tool, perform the HVAC Actuator Calibration Test.

      Did this DTC change from Stored to Active while performing the HVAC Actuator Calibration Test?

      Yes 

      • Go To  3

      No 

      • Go To  5
  3. CHECK THE (C27) VARIABLE A/C CONTROL CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off to the lock position.
    2. Disconnect the A/C Heater Module C1 harness connector.
    3. Disconnect the Variable A/C Compressor harness connector.
    4. Measure the resistance between ground and the (C27) Variable A/C Compressor control circuit.

      Is the resistance below 10k Ohms?

      Yes 

      • Repair the (C27) Variable A/C Compressor control circuit for a short to ground.
      • Perform the HVAC VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  4
  4. CHECK THE VARIABLE A/C COMPRESSOR 
    1. Diagnose the Variable A/C Compressor in accordance with the Service Information. Refer to DIAGNOSIS AND TESTING .
    2. Using the scan tool, erase HVAC DTCs and perform the HVAC Actuator Calibration Test.

      Did this DTC reset?

      Yes 

      • Replace and program the A/C Heater Module in accordance with the Service Information. Refer to REMOVAL .
      • Perform the HVAC VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

  5. CHECK THE WIRING AND CONNECTORS 
    1. The conditions necessary to set the DTC are not present at this time.
    2. Using 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 

      No 

      • Test complete.
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