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
  - 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 correct pin tension.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE LEFT TURN LAMPS
1. With the ignition on, turn the Left Turn Lamps on.
2. Compare the speed of the Left Turn Lamp Indicator, on the Instrument Panel Cluster (IPC), to the speed of the Front and Rear Left Turn Lamps and Left Exterior Mirror Turn Lamp, if equipped.
  Does the IPC Left Turn Signal Indicator and Left Exterior Mirror Turn Lamp, if equipped, flash at the same rate as the Front and Rear Left Turn Lamps?
  
  Yes
  - Go To 5
  No
  - Go To 3
CHECK THE (L551) LEFT FRONT LIGHTING FAULT SENSE CIRCUIT FOR A SHORT TO VOLTAGE
NOTE:
Verify the Left Turn Lamps are off when performing this step.
1. Turn the Left Turn Lamps off.
2. Turn the ignition off.
3. Disconnect the Left Front Lamp Assembly harness connector.
4. Disconnect the BCM C6/F harness connector.
5. Turn the ignition on.
6. Measure the voltage on the (L551) Left Front Lighting Fault Sense circuit at the Left Front Lamp Assembly harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the short to voltage in the (L551) Left Front Lighting Fault Sense circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (L551) LEFT FRONT LIGHTING FAULT SENSE CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Measure the resistance of the (L551) Left Front Lighting Fault Sense circuit between the Left Front Lamp Assembly harness connector and the BCM C6/F harness connector.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 5
  No
  - Inspect the Left Front Lamp Assembly harness connector for pushed out terminals. If a pushed out terminal is found, attempt to repair the condition. If the condition cannot be repaired, a new wiring harness may need to be installed. If no problems are found at the Left Front Lamp Assembly harness connector, repair the open in the (L551) Left Front Lighting Fault Sense circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (L61) LEFT FRONT TURN LAMP DRIVER CIRCUIT FOR A SHORT TO VOLTAGE
NOTE:
Verify the Left Turn Lamps are off when performing this step.
1. Disconnect the Left Front Lamp Assembly harness connector.
2. Disconnect the BCM C4/D harness connector.
3. Turn the ignition on.
4. Measure the voltage between ground and the (L61) Left Front Turn Signal Driver circuit at the Left Front Lamp Assembly harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the short to voltage in the (L61) Left Front Turn Lamp Driver circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 6
CHECK THE (L61) LEFT FRONT TURN LAMP DRIVER CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Measure the resistance of the (L61) Left Front Turn Lamp Driver circuit between the Left Front Lamp Assembly harness connector and the BCM C4/D harness connector.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 7
  No
  - Repair the open in the (L61) Left Front Turn Lamp Driver circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (Z906) GROUND CIRCUITS FOR AN OPEN
1. Measure the resistance between ground and the (Z906) Ground circuits at the Left Front Lamp Assembly harness connector.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 8
  No
  - Repair the open in the (Z906) Ground circuit(s).
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE BCM FOR CORRECT OPERATION
1. Connect the BCM C4/D harness connector.
2. Connect a 12-volt test light between the (L61) Left Front Turn Lamp Driver circuit and the (Z906) Ground circuit at the Left Front Lamp Assembly harness connector.
3. Turn the ignition on.
4. Turn the Left Turn Lamps on.
  Does the test light blink on and off?
  
  Yes
  - Replace the Left Front Turn Lamp Bulb in accordance with the Service Information. Refer to UNIT, FRONT LAMP, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - 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 .