Diagnostic Test

WARNING: This page is about a different car, the 2012 RAM Pickup and 2012 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

VERIFY DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE
1. Turn the ignition on.
2. With the scan tool, read the active DTC's.
  Does the scan tool display U0037-11-LIN BUS - CIRCUIT SHORT TO GROUND?
  
  Yes
  - Go To 2.
  No
  - Refer to STORED LOST COMMUNICATION DTC's and perform the diagnostic procedure.
CHECK THE LIN BUS CIRCUIT

Fig 1: Measuring Voltage Of Lin Bus Circuit
Courtesy of CHRYSLER GROUP, LLC
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 (D500) LIN Bus circuit (2 Door cavity 3 - 4 Door cavity 6) and the (D501) LIN Bus Return circuit.
  Is the voltage below 7.0 Volts?
  
  Yes
  - Go To 3.
  No
  - Replace the Driver Window/Door Lock Switch.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
(D500) LIN BUS CIRCUIT FOR A SHORT TO GROUND

Fig 2: Checking LIN BUS Circuit For A Short To Ground
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 (D500) LIN Bus circuit in the Door Module C5 harness connector.
  Is the resistance below 10, 000 Ohms?
  
  Yes
  - Repair the short to ground in the (D500) LIN Bus circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 4.
(D500) LIN BUS CIRCUIT FOR A SHORT TO THE (D501) LIN BUS RETURN CIRCUIT

Fig 3: Checking LIN BUS Circuit For A Short To The LIN BUS Return Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between the (D500) LIN Bus circuit and the (D501) LIN Bus Return circuit in the Door Module C5 harness connector.
  Is the resistance below 10, 000 Ohms?
  
  Yes
  - Repair the (D500) LIN Bus circuit for a short to the (D501) LIN Bus Return circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Driver Door Module in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .