Diagnostic Test
WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK FOR AN ACTIVE DTC
- Turn the ignition on.
- 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 1 BUS CIRCUIT OPEN
- Turn the ignition off.
- Disconnect the Switch Bank Module harness connector.
- Turn the ignition on.
- Measure the voltage of the (D401) LIN 1 BUS circuit at the Switch Bank Module harness connector.
Is the voltage above 5.0 volts?
Yes
- Go To 3
No
- Repair the (D401) LIN 1 BUS circuit for an open.
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
- (A938) FUSED B(+) CIRCUIT OPEN
- Measure the voltage of the (A938) Fused B(+) circuit at the Switch Bank Module harness connector.
Is the voltage above 10.0 volts?
Yes
- Go To 4
No
- Repair the (A938) Fused B(+) circuit for an open.
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
- Measure the voltage of the (A938) Fused B(+) circuit at the Switch Bank Module harness connector.
- (Z911) GROUND CIRCUIT OPEN
- Measure the resistance between ground and the (Z911) Ground circuit at the Switch Bank Module harness connector.
Is the resistance above 10k Ohms?
Yes
- Repair the (Z911) Ground circuit for an open.
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
No
- Replace the Switch Bank Module in accordance with the Service Information.
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
- Measure the resistance between ground and the (Z911) Ground circuit at the Switch Bank Module harness connector.