Diagnostic Test

WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
1. With the scan tool, read Body Control Module (BCM) DTCs and record on the repair order.
2. Record the Environmental Data.
3. With the scan tool, erase DTCs.
4. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
5. With the scan tool, read BCM DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - 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 correct pin tension. Repair as needed. If no problems are found, test complete.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (L563) LEFT REAR LIGHTING FAULT SENSE CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the Left Turn Signal off.
2. Turn the ignition off.
3. Disconnect the Left Tail Lamp Assembly harness connector.
4. Disconnect the BCM C6/F harness connector.
5. Turn the ignition on.
6. Measure the voltage between ground and the (L563) Left Rear Lighting Fault Sense circuit.
  Is there any voltage present?
  
  Yes
  - Repair the short to voltage in the (L563) Left Rear Lighting Fault Sense circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (L563) LEFT REAR LIGHTING FAULT SENSE CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Measure the resistance of the (L563) Left Rear Lighting Fault Sense circuit between the Left Tail Lamp Assembly harness connector and the BCM C6/F harness connector.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the open in the (L563) Left Rear Lighting Fault Sense circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (Z906) GROUND CIRCUIT FOR AN OPEN
1. Measure the resistance of the (Z906) Ground circuit between ground and the Left Tail Lamp Assembly harness connector.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the open in the (Z906) Ground circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE BCM FOR CORRECT OPERATION
NOTE:
The Left Turn Signal must be off when performing this step.
1. Turn the ignition off.
2. Connect the BCM C6/F harness connector.
3. Connect the Left Tail Lamp Assembly harness connector.
4. Turn the ignition on.
  NOTE:
  To avoid damage to the terminals, insulation or weather-proof seals of the connector, use only approved connector back-probe tools when back-probing a connector.
5. Back-probe at the Left Tail Lamp Assembly harness connector and measure the voltage on the (L563) Left Rear Lighting Fault Sense circuit.
  Is there any voltage present?
  
  Yes
  - Go To 6
  No
  - Go To 7
CHECK THE LEFT TAIL LAMP ASSEMBLY FOR CORRECT OPERATION
1. Turn the Left Turn Signal on.
  NOTE:
  To avoid damage to the terminals, insulation or weather-proof seals of the connector, use only approved connector back-probe tools when back-probing a connector.
2. Back-probe at the Left Tail Lamp Assembly harness connector and measure the voltage on the (L563) Left Rear Lighting Fault Sense circuit.
  Does the voltage drop in sequence with the Turn Signal flashes?
  
  Yes
  - 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 correct pin tension. Repair as needed. If no problems are found, test complete.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Left Tail Lamp Assembly in accordance with the Service Information. Refer to LAMP, TAIL STOP TURN, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all BCM harness connectors.
2. Disconnect all related in-line harness connections (if equipped).
3. Disconnect the related component harness connectors.
4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
  - Proper connector installation.
  - Damaged connector locks.
  - Corrosion.
  - Other signs of water intrusion.
  - Weather seal damage (if equipped).
  - Bent terminals.
  - Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
  - Terminals that have been pushed back into the connector cavity.
  - Perform a terminal drag test on each connector terminal to verify proper terminal tension.
  Repair any conditions that are found.
5. Reconnect all BCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. With the scan tool, erase DTCs.
9. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
10. With the scan tool, read BCM DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Body Control Module (BCM) in accordance with the Service Information. Refer to MODULE, BODY CONTROL (BCM), REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  - Test complete.