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Diagnostic Test

WARNING: This page is about a different car, the 2006 Dodge Magnum, 2006 Dodge Charger, and 2006 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. 1)  VERIFY DTC U0020-CAN B BUS OFF PERFORMANCE IS ACTIVE 

    Turn the ignition on.

    With the scan tool, read Occupant Classification Module (OCM) DTCs.

    Does the scan tool display active: U0020-CAN B BUS OFF PERFORMANCE? 

    Yes 

    1. Go To 2.

    No 

    1. 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.
    2. Perform *ORC VERIFICATION TEST - VER 1 .
  2. 2)  CHECK FOR ACTIVE CAN B BUS RELATED DTCS IN THE FRONT CONTROL MODULE (FCM) 

    With the scan tool, read Front Control Module (FCM) DTCs

    Does the scan tool display any active CAN B BUS related DTCs? 

    Yes 

    1. Diagnose and repair the DTC(s).(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) .

    No 

    1. Go To 3.
  3. 3)  CHECK (D55) CAN B BUS (+) CIRCUIT FOR AN OPEN 
    Fig 1: Measuring Resistance Of CAN B Bus (+) Circuit
    GC0040857Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the negative battery cable.

    Disconnect the OCM C1 connector.

    Disconnect the Front Control Module (FCM) C1 connector.

    Measure the resistance of the (D55) CAN B Bus (+) circuit between the Front Control Module C1 connector and the OCM C1 connector.

    Is the resistance below 2.0 ohms? 

    Yes 

    1. Go To 4.

    No 

    1. Repair the (D55) CAN B Bus (+) circuit for an open.
    2. Perform *OCS VERIFICATION TEST - VER 1 .
  4. 4)  CHECK (D54) CAN B BUS (-) CIRCUIT FOR AN OPEN 
    Fig 2: Measuring Resistance Of CAN B Bus (-) Circuit
    GC0040858Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance of the (D54) CAN B Bus (-) circuit between the Front Control Module C1 connector and the OCM C1 connector.

    Is the resistance below 2.0 ohms? 

    Yes 

    1. Replace the OCM in accordance with the Service Information.
    2. Perform *OCS VERIFICATION TEST - VER 1 .

    No 

    1. Repair the (D54) CAN B Bus (-) circuit for an open.
    2. Perform *OCS VERIFICATION TEST - VER 1 .
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