Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

VERIFY DTC IS ACTIVE
1. Turn the ignition on.
2. With the scan tool, read active Door Module DTCs.
  Does the scan tool display: U0037-11-LIN BUS - CIRCUIT SHORT TO GROUND as Active?
  
  Yes
  - Go To 2
  No
  - Refer to DIAGNOSIS AND TESTING and perform the Stored Lost Communication DTCs diagnostic procedure.
CHECK THE LIN BUS CIRCUIT
1. Turn the ignition off.
2. Disconnect the Driver Window/Door Lock Switch C1 harness connector.
3. Turn the ignition on.
4. Measure the voltage between the (D903) Driver Door LIN Bus circuit and the (D512) Driver Door Lin Bus Return circuit in the Driver Window Switch C1 connector.
  Is the voltage above 7.0 volts?
  
  Yes
  - Replace the Driver Window/Door Lock Switch.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 3
(D903) DRIVER DOOR LIN BUS CIRCUIT SHORTED TO GROUND

Fig 1: Measuring Resistance Between Ground & LIN Bus Circuit In Door Module C5 Connector
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the Driver Door Module C5 harness connector.
3. Measure the resistance between Ground and the (D903) Driver Door LIN Bus circuit in the Door Module C5 harness connector.
  Is the resistance below 10K Ohms?
  
  Yes
  - Repair the (D903) Driver Door LIN Bus circuit for a short to the ground.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 4
(D903) DRIVER DOOR LIN BUS CIRCUIT SHORTED TO THE (D512) DRIVER DOOR LIN BUS RETURN CIRCUIT

Fig 2: Checking Lin Bus Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between the (D903) Driver Door LIN Bus circuit and the (D512) Driver Door LIN Bus Return circuit in the Door Module C5 harness connector.
  Is the resistance below 10K Ohms?
  
  Yes
  - Repair the (D903) Driver Door LIN Bus circuit for a short to the (D512) Driver Door LIN Bus Sense Return circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Replace the Driver Door Module in accordance with the Service Information. Refer to MODULE, DOOR, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .