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Home >> Chrysler >> 2011 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 672 (Driver Door Module (DDM) (DMFL/R) - Electrical Diagnostics - 2500 Hd & 3500 Hd) >> Diagnosis And Testing >> U113D-00-Lost Communication With Master Power Window Switch >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2014 RAM 3500 HD and 2014 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR AN ACTIVE DTC 
    NOTE:

    Make sure the battery is fully charged before proceeding.

    1. Turn the ignition on.
    2. With the scan tool, record and erase DTCs.
    3. Try to operate the Front Windows up and down several times.
    4. Wait 30 seconds.
    5. With the scan tool, read DDM DTCs.

      Is the DTC active?

      Yes 

      • Go To  2

      No 

      • Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and poor pin fit.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  2. CHECK THE (Q291) DOOR MODULE FEED TO DOOR SWITCH CIRCUIT FOR A OPEN 
    1. With the scan tool, erase the DTCs.
    2. Turn the ignition off.
    3. Disconnect the Driver Window/Door Lock Switch harness connector.
    4. Turn the ignition on.
    5. Using a 12-volt test light connected to Ground, check the (Q291) Door Module Feed To Window Switch circuit in the Driver Window/Door Lock Switch harness connector.
      NOTE:

      The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

      Does the test light illuminate brightly?

      Yes 

      • Go To  3

      No 

      • Go To  9
  3. CHECK THE LIN BUS CIRCUIT 
    1. Measure the voltage between the (D903) Driver Door LIN Bus circuit and the (D512) Driver Door LIN Bus Return circuit in the Driver Window/Door Lock Switch C1 connector.

      Is the voltage above 8.0 volts?

      Yes 

      • Go To  4

      No 

      • Go To  5
  4. CHECK THE (D903) DRIVER DOOR LIN BUS CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the Driver Door Module C5 harness connector.
    3. Turn the ignition on.
    4. Measure the voltage between Ground and the (D903) Driver Door LIN Bus circuit.

      Is there any voltage present?

      Yes 

      • Repair the (D903) Driver Door LIN Bus circuit for a short to voltage.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

  5. CHECK THE (D512) DRIVER DOOR LIN BUS RETURN CIRCUIT FOR A OPEN 
    1. Using a 12-volt test light connected to 12-volts, check the (D512) Driver Door LIN Bus Return circuit in the Driver Window/Door Lock Switch C1 harness connector.

      Does the test light illuminate brightly?

      Yes 

      • Go To  6

      No 

      • Repair the (D512) Driver Door LIN Bus Return circuit for an open.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  6. CHECK THE (D903) DRIVER DOOR LIN BUS CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition on.
    2. Measure the voltage between Ground and the (D903) Driver Door LIN Bus circuit in the Door Module C5 harness connector.

      Is there any voltage present?

      Yes 

      • Repair the short to voltage in the (D903) LIN Bus circuit.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  7
  7. CHECK THE (D903) DRIVER DOOR LIN BUS CIRCUIT FOR A SHORT TO GROUND 
    1. Check for continuity between Ground and the (D903) Driver Door LIN Bus circuit in the Door Module C5 harness connector.

      Is there continuity between Ground and the (D903) Driver Door LIN Bus circuit in the Door Module C5 harness connector?

      Yes 

      • Repair the short to the ground in the (D903) Driver Door LIN Bus circuit.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  8
  8. CHECK THE (D903) DRIVER DOOR LIN BUS CIRCUIT FOR A OPEN 
    1. Measure the resistance of the (D903) Driver Door LIN Bus circuit between the Door Module C5 harness connector and the Driver Window/Door Lock Switch C1 harness connector.

      Is the resistance below 2.0 Ohms?

      Yes 

      No 

      • Repair the (D903) Driver Door LIN Bus circuit for an open.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  9. CHECK THE (Q291) DOOR MODULE FEED TO DOOR SWITCH CIRCUIT FOR A OPEN 
    1. Turn the ignition off.
    2. Disconnect the Driver Window/Door Lock Switch C1 connector.
    3. Measure the resistance of the (Q291) Door Module Feed To Door Switch circuit between the Door Module C5 harness connector and the Driver Window/Door Lock Switch C1 harness connector.

      Is the resistance below 2.0 Ohms?

      Yes 

      No 

      • Repair the (Q291) Door Module Feed To Door Switch circuit for an open.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
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