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. 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 (A990) FUSED B(+) CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the Compass Module harness connector.
3. Turn the ignition on.
4. Measure the voltage on the (A990) Fused B(+) circuit at the Compass Module harness connector.
  Is the voltage above 10 volts?
  
  Yes
  - Go To 3
  No
  - Repair the open or short to ground in the (A990) Fused B(+) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (Z911) GROUND CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Measure the resistance between ground and the (Z911) Ground circuit at the Compass Module harness connector.
  Is the resistance above 3.0 Ohms?
  
  Yes
  - Repair the open in the (Z911) Ground circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (D402) LIN 2 BUS CIRCUIT FOR AN OPEN
1. Turn the ignition on.
2. Measure the voltage between ground and the (D402) LIN 2 Bus circuit at the Compass Module harness connector.
  Is there any voltage present?
  
  Yes
  - Replace the Compass Module in accordance with the Service Information. Refer to MODULE, COMPASS, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Repair the open in the (D402) LIN 2 Bus circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .