Diagnostic Test

WARNING: This page is about a different car, the 2016 RAM 3500 HD and 2016 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

VERIFY THE DTC IS ACTIVE
NOTE:
This DTC must be active for the results of this test to be valid.
1. Perform any Technical Service Bulletins (TSBs) that may apply.
2. Turn the ignition on.
3. With the scan tool, record and erase DTCs.
4. Cycle the ignition switch from off to on.
5. With the scan tool, read DTCs.
  Is the DTC active at this time?
  
  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.
CHECK THE FUSE
1. Ignition on, engine not running.
2. Using a 12-volt test light connected to ground, check the fuse for power.
  Is the fuse good?
  
  Yes
  - Go To 4
  No
  - Go To 3
(A991) FUSED B(+) CIRCUIT SHORT TO GROUND
1. Turn the ignition off to the lock position
2. Disconnect the VSIM C1 harness connector.
3. Measure the resistance between ground and the (A991) Fused B(+) circuit at the VSIM harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Repair the (A991) Fused B(+) circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 4
(Z910) GROUND CIRCUIT OPEN OR HIGH RESISTANCE
1. Measure the resistance between ground and the (Z910) Ground circuit at the VSIM C1 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Repair the (Z910) Ground circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Vehicle System Interface Module (VSIM) in accordance with the Service Information. Refer to MODULE, VEHICLE SYSTEM INTERFACE, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .