Diagnostic Test

VERIFY DTC U0019-CAN B BUS IS ACTIVE
1. Turn the ignition on.
2. With the scan tool, read HVAC DTCs.
  Does the scan tool display active: U0019-CAN B BUS?
  
  Yes
  - Go to step 2
  No
  - If the DTC is stored, check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
CHECK FOR ACTIVE CAN B BUS RELATED DTCS IN THE FRONT CONTROL MODULE (FCM)
1. With the scan tool, read TIPM DTCs
  Does the scan tool display any active CAN B BUS related DTCs?
  
  Yes
  - Diagnose and repair the DTCs. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Diagnosis and Testing .
  No
  - Go to step 3
CHECK (D55) CAN B BUS (+) CIRCUIT FOR AN OPEN

Fig 1: Checking CAN B BUS (+) Circuit For An Open
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the negative battery cable.
3. Disconnect the A/C Heater Control C1 harness connector.
4. Disconnect the TIPM harness connector.
5. Measure the resistance of the (D55) CAN B Bus (+) circuit between the TIPM harness connector and the A/C Heater Control C1 harness connector.
  Is the resistance below 2.0 ohms?
  
  Yes
  - Go to step 4
  No
  - Repair the (D55) CAN B Bus (+) circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
CHECK (D54) CAN B BUS (-) CIRCUIT FOR AN OPEN

Fig 2: Checking CAN B BUS (-) Circuit For An Open
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (D54) CAN B Bus (-) circuit between the TIPM connector and the A/C Heater Control C1 harness connector.
  Is the resistance below 2.0 ohms?
  
  Yes
  - Replace the A/C Heater Control in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
  No
  - Repair the (D54) CAN B Bus (-) circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure