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Diagnostic Test

WARNING: This page is about a different car, the 2008 Dodge Magnum, 2008 Dodge Charger, and 2008 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR AN ACTIVE DTC 

    Turn the ignition on.

    With the scan tool, record and erase DTCs.

    Cycle the ignition from on to off 3 times.

    Turn the ignition on.

    With the scan tool, read DTCs.

    Is the DTC active? 

    Yes 

    1. Go To  2.

    No 

    1. The condition that caused this code to set is not present at this time. 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.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  2. CHECK FRONT CONTROL MODULE DTCs 

    With the scan tool, read Front Control Module DTCs.

    Does the scan tool display the U0019-CAN B BUS DTC? 

    Yes 

    1. Refer to the symptom list for problems related to Communication in the ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS article.

    No 

    1. Go to  3.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  3. CAN B BUS (+) CIRCUIT OPEN 
    Fig 1: Checking Can B Bus (+) Circuit
    GC0016037Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the Instrument Cluster C1 harness connector.

    Disconnect the Front Control Module C1 harness connector.

    Measure the resistance of the (D55) Can B Bus (+) circuit between the Front Control Module C1 harness connector and the Instrument Cluster C1 harness connector.

    Is the resistance below 2.0 ohms? 

    Yes 

    1. Go To  4.

    No 

    1. Repair the Can B Bus (+) circuit for an open.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  4. CAN B BUS (-) CIRCUIT OPEN 
    Fig 2: Checking Can B Bus (-) Circuit
    GC0016038Courtesy of CHRYSLER LLC

    Measure the resistance of the (D54) Can B Bus (-) circuit between the Front Control Module C1 harness connector and the Instrument Cluster C1 harness connector.

    Is the resistance below 2.0 ohms? 

    Yes 

    1. Replace the Instrument Cluster in accordance with the service information.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Repair the Can B Bus (-) circuit for an open.
    2. Perform BODY VERIFICATION TEST - VER 1 .
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