Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Pickup and 2011 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 DTCs.
  Does the scan tool display U0037-11-LIN BUS - CIRCUIT SHORT TO GROUND?
  
  Yes
  - Go To 2.
  No
  - Perform the STORED LOST COMMUNICATION DTCS for 1500, 2500 and 3500, or STORED LOST COMMUNICATION DTCS for 3500 Cab & Chassis, 4500 and 5500 diagnostic procedure .
CHECK THE LIN BUS CIRCUIT

Fig 1: Checking LIN BUS Circuit
Courtesy of CHRYSLER 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 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 for 1500, 2500 & 3500, or BODY VERIFICATION TEST for 3500 CAB & CHASSIS, 4500 & 5500 .
(D500) LIN BUS CIRCUIT SHORTED TO GROUND

Fig 2: Checking LIN BUS Circuit For Short
Courtesy of CHRYSLER 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 for 1500, 2500 & 3500, or BODY VERIFICATION TEST for 3500 CAB & CHASSIS, 4500 & 5500 .
  No
  - Go To 4.
(D500) LIN BUS CIRCUIT SHORTED TO THE (D501) LIN BUS RETURN CIRCUIT

Fig 3: Checking LIN BUS Circuit For Short
Courtesy of CHRYSLER 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 for 1500, 2500 & 3500, or BODY VERIFICATION TEST for 3500 CAB & CHASSIS, 4500 & 5500 .
  No
  - Replace the Driver Door Module in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST for 1500, 2500 & 3500, or BODY VERIFICATION TEST for 3500 CAB & CHASSIS, 4500 & 5500 .