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HOMESERVICE MANUALSJEEP2008COMMANDER LIMITED, 4.7 N, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESNAVIGATION SYSTEM & TELECOMMUNICATION SYSTEM - ELECTRICAL DIAGNOSTICSNAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICSDTC TROUBLESHOOTINGU0019-CAN B BUSDIAGNOSTIC TEST
2008 Jeep Commander Limited, 4.7 N, RWD

Diagnostic Test

2008 Jeep Commander Limited, 4.7 N, RWDSECTION Diagnostic Test
  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  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. 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 DIAGNOSIS AND TESTING .

    No 

    1. Go To  3.
  3. (D55) CAN B BUS (+) CIRCUIT OPEN 
    Fig 1: Measuring Resistance Of (D55) CAN B Bus (+) Circuit Between Front Control Module C1 Connector And Hands Free Module Connector
    GC0016212Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the negative battery cable.

    Disconnect the Hands Free 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 Hands Free Module 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 BODY VERIFICATION TEST .
  4. (D54) CAN B BUS (-) CIRCUIT OPEN 
    Fig 2: Measuring Resistance Of (D54) CAN B Bus (-) Circuit Between Front Control Module C1 Connector And Hands Free Module Connector
    GC0016213Courtesy of CHRYSLER LLC

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

    Is the resistance below 2.0 ohms? 

    Yes 

    1. Replace the Hands Free Module in accordance with the service information.
    2. Perform BODY VERIFICATION TEST .

    No 

    1. Repair the (D54) CAN B Bus (-) circuit for an open.
    2. Perform BODY VERIFICATION TEST .
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.