Diagnostic Test

CHECK FOR ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) 31, 32, 83, OR 84 IN THE A/C HEATER CONTROL
1. Turn the ignition on.
2. Actuate the Display DTC function by performing the following:
  - Turn the blower control on.
  - Press the A/C mode switch down, turn the blower control to off, wait until both LEDs illuminate (approximately 5 seconds) and then release the A/C mode switch.
  NOTE: The A/C status indicator displays active DTCs when the EBL status indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated.
3. Read DTCs from the A/C status indictor.
  Does the A/C status indicator display DTC 31, 32, 83, or 84?
  
  Yes
  - Diagnose and repair the DTCs. Run the Cool down Test again after the repair is complete.
  No
  - Go to step 2
ERASE DTCs IN THE A/C HEATER CONTROL
1. Actuate the Clear DTC function by performing the following:
  - Turn the blower control on.
  - Press the A/C mode switch down, turn the blower control to off, wait until both LEDs illuminate (approximately 5 seconds) and then release the A/C mode switch.
  - When the A/C status indicator begins displaying DTCs, set the Mode switch to the floor position, simultaneously press the A/C mode switch and the EBL mode switch down until both LEDs start flashing (approximately 5 seconds) and then release the mode switches. Stored DTCs will clear from memory in approximately two seconds.
2. Turn the ignition off.
  - Go to step 3
VERIFY IF DTC 82 SET DUE TO EVAPORATOR TEMPERATURE BEING BELOW 18.3°C (65°F)
CAUTION: The work area ambient temperature and the evaporator temperature must be above 18.3°C (65°F) in order to test A/C system performance.
1. Start the engine.
2. Set the Mode switch to the panel position.
3. Press the A/C mode switch off (status indicator not illuminated/compressor not running).
4. Turn the blower control to high speed. Allow the blower to run for 5 minutes before proceeding.
5. Turn the blower control off.
6. Actuate the Cool down Test by performing the following:
  - Press and hold the A/C mode switch down and then turn the blower motor control to high speed. Continue to hold the A/C mode switch down until the A/C status indicator begins flashing, Then, release the mode switch. While the test is running, the A/C status indicator will flash once per second. If the test passes, the A/C status indicator will stop flashing. If the test fails, the A/C and EBL status indicators will flash alternately. Allow the test to run to completion before proceeding.
  - Go to step 4
CHECK FOR DTCS IN THE A/C HEATER CONTROL
1. Actuate the Display DTC function by performing the following:
  - Turn the blower control on.
  - Press the A/C mode switch down, turn the blower control to off, wait until both LEDs illuminate (approximately 5 seconds) and then release the A/C mode switch.
  NOTE: The A/C status indicator displays active DTCs when the EBL status indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated.
2. Read DTCs from the A/C status indictor.
  Does the A/C status indicator display DTC 82?
  
  Yes, AND No Other DTCs Present
  - Go to step 5
  Yes, AND Other DTCs Present
  - Diagnose and repair the other DTCs.
  No, But Other DTCs Present
  - Diagnose and repair the DTCs. Run the Cool down Test again after the repair is complete.
  No, AND No Other DTCs Present
  - Perform additional testing as necessary.
CHECK THE (C121) SENSOR GROUND CIRCUIT FOR HIGH RESISTANCE

Fig 1: Checking Sensor Ground Circuit For High Resistance
Courtesy of CHRYSLER LLC

NOTE: Ensure that the voltmeter leads are connected for positive polarity and that they meet the terminals in the connector. Also ensure that there is a good terminal to wire connection.
1. Turn the ignition off.
2. Back probe the (C121) Sensor Ground circuit between the Evaporator Temperature Sensor harness connector and the A/C Heater Control C2 harness connector.
3. Turn the ignition on.
  Is the voltage below 0.10 volts?
  
  Yes
  - Go to step 6
  No
  - Repair the (C121) Sensor Ground circuit for high resistance. Run the Cool down Test again after the repair is complete.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
CHECK THE (C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT FOR HIGH RESISTANCE

Fig 2: Checking Evaporator Temperature Sensor Signal Circuit For High Resistance
Courtesy of CHRYSLER LLC

NOTE: Ensure that the voltmeter leads are connected for positive polarity and that they meet the terminals in the connector. Also ensure that there is a good terminal to wire connection.
1. Turn the ignition off.
2. Back probe the (C21) Evaporator Temperature Sensor Signal circuit between the Evaporator Temperature Sensor harness connector and the A/C Heater Control C2 harness connector.
3. Turn the ignition on.
  Is the voltage below 0.10 volts?
  
  Yes
  - Replace the A/C Heater Control in accordance with the Service Information. Run the Cool down Test again after the repair is complete.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
  No
  - Repair the (C21) Evaporator Temperature Sensor Signal circuit for high resistance. Run the Cool down Test again after the repair is complete.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure