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Home >> Jeep >> 2005 >> Wrangler Rubicon, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 581 (DTCS B1BC7 To U0019) >> Diagnosis And Testing >> U0019-Can B Bus-OCM >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
  1. 1)  VERIFY DTC U0019-CAN B BUS IS ACTIVE 

    Turn the ignition on.

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

    Does the scan tool display active: U0019-CAN B BUS? 

    Yes 

    1. Go To step  2).

    No 

    1. If the DTC is stored, check for an intermittent condition by inspecting the related wiring harness for chaffed, 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 step  3).
  3. 3)  CHECK (D55) CAN B BUS (+) CIRCUIT FOR AN OPEN 
    Fig 1: Checking Can B Bus (+) Circuit For Open
    GC0027714Courtesy of DAIMLERCHRYSLER CORP.
    WARNING: To avoid personal injury or death, turn the ignition off, disconnect the battery and wait two minutes before proceeding.
    WARNING: If the Occupant Classification Module is dropped at any time, it must be replaced. Failure to take the proper precautions can result in accidental airbag deployment and personal injury or death.

    Disconnect the OCM C1 connector.

    NOTE: Check connectors - Clean and repair as necessary.

    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 step  4).

    No 

    1. Repair the (D55) CAN B Bus (+) circuit for an open.
    2. Perform *ORC VERIFICATION TEST - VER 1 .
  4. 4)  CHECK (D54) CAN B BUS (-) CIRCUIT FOR AN OPEN 
    Fig 2: Checking Can B Bus (-) Circuit For Open
    GC0027715Courtesy 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 *ORC VERIFICATION TEST - VER 1 .

    No 

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