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Home >> Chrysler >> 2006 >> 300 Base, 42RLE >> Repair and Diagnosis >> Body & Frame >> Sun Roof/T-Top/Convertible Top >> Power Top & Sunroof - Electrical Diagnosis >> Electrical Diagnosis >> Diagnosis And Testing >> U0019-Can B Bus >> Diagnostic Test

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 five times, leaving the ignition on for a minimum of 90 seconds per cycle.

    Turn the ignition off and wait 30 seconds.

    Turn the ignition on.

    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 ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING)

    No 

    1. Go To  3.
  3. (D55) CAN B BUS (+) CIRCUIT OPEN 
    Fig 1: Checking CAN B Bus (+) Circuit For Open
    GC0016417Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the negative battery cable.

    Disconnect the Sunroof Motor/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 Sunroof Motor/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 - VER 1. (Refer to BODY VERIFICATION TEST - VER 1) .
  4. (D54) CAN B BUS (-) CIRCUIT OPEN 
    Fig 2: Checking CAN B Bus (-) Circuit For Open
    GC0016418Courtesy of DAIMLERCHRYSLER CORP.

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

    Is the resistance below 2.0 ohms? 

    Yes 

    1. Replace the Sunroof Motor/Module in accordance with the service information.
    2. Perform the Sunroof Position Calibration, (Refer to ELECTRICAL/POWER TOP/MOTOR - STANDARD PROCEDURE - SUNROOF POSITION CALIBRATION) . Perform the Excessive Force Limitation Calibration, (Refer to ELECTRICAL/POWER TOP/MOTOR - STANDARD PROCEDURE - EXCESSIVE FORCE LIMITATION CALIBRATION) .
    3. Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.

    No 

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