Diagnostic Test

WARNING: This page is about a different car, the 2024 RAM ProMaster EV. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
1. With the scan tool, read Body Control Module (BCM) DTCs and record on the repair order.
2. Record the Environmental Data.
3. With the scan tool, erase DTCs.
4. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
5. With the scan tool, read BCM DTCs.
  Did the DTC return?
  
  Yes
  - Go To Next Step.
  No
  - Perform the TESTING FOR INTERMITTENT CONDITIONS procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
MEASURE THE VOLTAGE ON THE (A92) STEERING WHEEL SENSE MODULE (SWSM) FUSED B(+) CIRCUIT
1. Turn the ignition off.
2. Disconnect the Steering Wheel Sense Module (SWSM) harness connector.
3. Turn the ignition on.
4. Measure the voltage on the Fused B(+) circuit at the Steering Wheel Sense Module (SWSM) harness connector.
  Is the voltage above 9.0 volts?
  
  Yes
  - Go To Next Step.
  No
  - Repair the open or short to ground in the Fused B(+) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (Z92) STEERING WHEEL SENSE MODULE (SWSM) GROUND CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Measure the resistance between ground and the Ground circuit at the Steering Wheel Sense Module (SWSM) harness connector.
  Is the resistance above 3.0 Ohms?
  
  Yes
  - Repair the open in the Ground circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To Next Step.
CHECK THE (D404) LIN BUS 4 CIRCUIT FOR AN OPEN
1. Disconnect the BCM harness connector that contains the LIN Bus 4 circuit.
2. Measure the resistance of the LIN Bus 4 circuit between the Steering Wheel Sense Module (SWSM) harness connector and the BCM harness connector.
  Is the resistance above 3.0 Ohms?
  
  Yes
  - Repair the open in the LIN Bus 4 circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To Next Step.
CHECK THE VOLTAGE ON THE LIN BUS 4 CIRCUIT
1. Reconnect the BCM harness connector that contains the LIN Bus 4 circuit.
2. Turn the ignition on.
3. Measure the voltage on the LIN Bus 4 circuit at the Steering Wheel Sense Module (SWSM) harness connector.
  Is the voltage above 3.0 volts?
  
  Yes
  - Replace the Steering Wheel Sense Module (SWSM) integral to the Steering Wheel in accordance with the Service Information. Refer to WHEEL, STEERING, REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To Next Step.
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all BCM harness connectors.
2. Disconnect all related in-line harness connections (if equipped).
3. Disconnect the related component harness connectors.
4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
  - Proper connector installation.
  - Damaged connector locks.
  - Corrosion.
  - Other signs of water intrusion.
  - Weather seal damage (if equipped).
  - Bent terminals.
  - Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
  - Terminals that have been pushed back into the connector cavity.
  - Perform a terminal drag test on each connector terminal to verify proper terminal tension.
  Repair any conditions that are found.
5. Reconnect all BCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. With the scan tool, erase DTCs.
9. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
10. With the scan tool, read BCM DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Body Control Module (BCM) in accordance with the Service Information. Refer to MODULE, BODY CONTROL (BCM), REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  - Test complete.