Diagnostic Test

WARNING: This page is about a different car, the 2012 Jeep Patriot and 2012 Jeep Compass. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR ACTIVE DIAGNOSTIC TROUBLE CODE (DTC)s
1. With the scan tool, read the active DTCs.
2. Cycle the ignition switch from off to on at least five times, leaving the ignition on for a minimum of 90 seconds per cycle.
3. With the scan tool, read the active DTCs.
  Does the scan tool display: U0019-CAN B BUS as active?
  
  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 poor pin fit.
CHECK TIPM DTCs
1. With the scan tool, read the TIPM active DTCs.
  Does the scan tool display any CAN B BUS DTCs as Active?
  
  Yes
  - Refer to TOTALLY INTEGRATED POWER MODULE (TIPM) - DTCS B106B TO B2304 or TOTALLY INTEGRATED POWER MODULE (TIPM) - DTCS B2305 TO U1108 and perform the appropriate diagnostic procedure.
  No
  - Go To 3.
(D55) CAN B BUS (+) CIRCUIT OPEN

Fig 1: Checking CAN B BUS (+) Circuit For An Open
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the negative battery cable.
3. Disconnect the WCM (SKREEM) 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 WCM harness connector.
  Is the resistance below 2.0 Ohms?
  
  Yes
  - Go To 4.
  No
  - Repair the open in the (D55) CAN B Bus (+) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
(D54) CAN B BUS (-) CIRCUIT OPEN

Fig 2: Checking CAN B BUS (+) Circuit For An Open
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance of the (D54) CAN B Bus (-) circuit between the TIPM harness connector and the WCM harness connector.
  Is the resistance below 2.0 Ohms?
  
  Yes
  - Replace the Wireless Control Module (WCM) (SKREEM) in accordance with the Service Information. Refer to MODULE, SENTRY KEY IMMOBILIZER (SKREEM), REMOVAL .
  - Perform the SKIS IDENTIFICATION TEST. Refer to SKIS INITIALIZATION .
  No
  - Repair the open in the (D54) CAN B Bus (-) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .