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
NOTE:
Visually inspect the negative battery cable connection to the Intelligent Battery Sensor (IBS) for any damage or corrosion. Repair as necessary.
1. Turn the ignition on.
2. With the scan tool, read DTCs.
  Does the scan tool display this DTC as active?
  
  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 (A916) FUSED B(+) CIRCUIT FOR AN OPEN OR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the IBS harness connector.
3. Measure the voltage on the (A916) Fused B(+) circuit at the IBS harness connector.
  Is the voltage above 10.0 volts?
  
  Yes
  - Go To 3
  No
  - Repair the open or short to ground in the (A916) Fused B(+) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE GROUND CIRCUIT(S) FOR AN OPEN
1. Measure the resistance between ground and the Ground circuits at the IBS harness connector.
  Is the resistance above 3.0 Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the open in the Ground circuit(s).
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE VOLTAGE OF THE (D401) LIN BUS CIRCUIT
1. Turn the ignition on.
2. Measure the voltage between ground and the (D401) LIN Bus circuit in the IBS harness connector.
  Is there any voltage present?
  
  Yes
  - Replace the Intelligent Battery Sensor (IBS) in accordance with the Service Information. Refer to SENSOR, INTELLIGENT BATTERY (IBS), REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 5
CHECK THE (D401) LIN BUS CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the BCM C7/G harness connector.
3. Measure the resistance of the (D401) LIN Bus circuit between the IBS harness connector and the BCM C7/G harness connector.
  Is the resistance above 3.0 Ohms?
  
  Yes
  - Repair the open in the (D401) LIN Bus circuit.
  - 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 .