Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
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.
(D401) LIN BUS CIRCUIT OPEN
1. Turn the ignition off.
2. Disconnect the Transfer Case Switch harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (D401) LIN BUS circuit at the Transfer Case Switch harness connector.
  Is the voltage above 5.0 volts?
  
  Yes
  - Go To 3
  No
  - Repair the (D401) LIN BUS circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to MODULE, BODY CONTROL, REMOVAL .
(A195) FUSED B(+) CIRCUIT OPEN
1. Measure the voltage of the (A195) Fused B(+) circuit at the Transfer Case Switch harness connector.
  Is the voltage above 10.0 volts?
  
  Yes
  - Go To 4
  No
  - Repair the (A195) Fused B(+) circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to MODULE, BODY CONTROL, REMOVAL .
(Z911) GROUND CIRCUIT OPEN
1. Measure the resistance between ground and the (Z911) Ground circuit at the Transfer Case Switch harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Repair the (Z911) Ground circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to MODULE, BODY CONTROL, REMOVAL .
  No
  - Replace the Transfer Case Switch in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to MODULE, BODY CONTROL, REMOVAL .