Diagnostic Test

TEST FOR INTERMITTENT CONDITION
NOTE:
Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.
1. Turn the ignition on.
  NOTE:
  Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.
2. With the scan tool, select ECU View.
  NOTE:
  A red "X" will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.
  
  Does the scan tool display a red "X" next to the module?
  
  Yes
  - Go To 2
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time. 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.
(Z903) GROUND CIRCUIT OPEN

Fig 1: Checking Ground Circuit For Open
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the A/C Heater Control C1 harness connector.
3. Using a 12-volt test light connected to 12-volts check the (Z903) Ground circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 3
  No
  - Repair the open in the (Z903) Ground circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
(A417) FUSED B+ (I.O.D.) CIRCUIT OPEN OR SHORTED

Fig 2: Checking Fused B+ (I.O.D.) Circuit For An Open Or A Short
Courtesy of CHRYSLER GROUP, LLC
1. Using a 12-volt test light connected to ground, check the (A417) Fused B+ (I.O.D.) circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 4
  No
  - Repair the open or short in the (A417) Fused B+ (I.O.D.) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
(F929) FUSED IGNITION SWITCH OUTPUT (RUN) CIRCUIT OPEN OR SHORTED

Fig 3: Checking Fused Ignition Switch Output (Run) Circuit For An Open Or Short
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition on.
2. Using a 12-volt test light connected to ground, check the (F929) Fused Ignition Switch Output (RUN) circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 5
  No
  - Repair the open or short in the (F929) Fused Ignition Switch Output (RUN) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
(D55) AND (D54) CAN B BUS CIRCUITS OPEN

Fig 4: Checking Can B Bus Circuits For An Open
Courtesy of CHRYSLER GROUP, LLC

NOTE:
One open circuit will not cause this condition.
1. Measure the voltage between ground and the (D54) CAN B Bus (-) circuit.
2. Measure the voltage between ground and the (D55) CAN B Bus (+) circuit.
  Is there any voltage present on either circuit?
  
  Yes
  - Replace the Heating, Ventilation and Air Conditioning Control Head in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Repair the open in the (D55) and (D54) CAN B Bus circuits. Inspect the connector for damage.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .