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Home >> Jeep >> 2005 >> Wrangler Rubicon, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 557 (Vehicle Theft Security System - Electrical Diagnostics) >> Vehicle Theft Security - Electrical Diagnostics >> DTC Troubleshooting >> U0019-Can B Bus >> 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)  CHECK FOR ACTIVE DTCS 

    With the scan tool, read the active DTC's.

    Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle.

    With the scan tool, read the active DTC's.

    Does the scan tool display this DTC as active? 

    Yes 

    1. Go To step  2).

    No 

    1. If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
  2. 2)  CHECK FRONT CONTROL MODULE DTC's 

    With the scan tool, read Front Control Module active DTC's

    Does the scan tool display any CAN B BUS DTC's - ACTIVE? 

    Yes 

    1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING)

    No 

    1. Go To step  3).
  3. 3)  (D55) CAN B BUS (+) CIRCUIT OPEN 
    Fig 1: Checking CAN B BUS (+) Circuit
    GC0012441Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the negative battery cable.

    Disconnect the Sentry Key Remote Entry Module connector.

    Disconnect the Front Control Module C1 connector.

    Measure the resistance of the (D55) CAN B Bus (+) circuit between the Front Control Module C1 connector and the Sentry Key Remote Entry Module 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 BODY VERIFICATION TEST - VER 1 .
  4. 4)  (D54) CAN B BUS (-) CIRCUIT OPEN 
    Fig 2: Checking CAN B BUS (-) Circuit
    GC0018970Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance of the (D54) CAN B Bus (1) circuit between the Front Control Module C1 connector and the Sentry Key Remote Entry Module connector.

    Is the resistance below 2.0 ohms? 

    Yes 

    1. Replace the Sentry Key Remote Entry Module in accordance with the service information.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

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