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Home >> Dodge and Ram >> 2024 >> ProMaster 2500 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 13 (Body Control Module (BCM) - DTCS B1107-18 To B145E-01) >> DTC Troubleshooting >> B145E-01 Left Backside SWS (Steering Wheel Switch) - General Electrical Failure >> Diagnostic Test

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.
  1. 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 

  2. CHECK FOR ADDITIONAL LIN BUS DTCS 
    1. With the scan tool, read BCM DTCs.

      Is there any LIN BUS SIGNAL/MESSAGE FAILURE DTCs Active in the BCM?

      Yes 

      • Go to the appropriate diagnostic information and perform the appropriate diagnostic procedure.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To Next Step.
  3. CHECK THE LEFT REAR STEERING WHEEL SWITCH FOR PROPER OPERATION 
    1. Check the Left Rear Steering Wheel Switch for proper operation. Refer to AUDIO SYSTEM, DIAGNOSIS AND TESTING .

      Were any problems found with Left Rear Steering Wheel Switch?

      Yes 

      • Replace the Left Rear Steering Wheel Switch in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To Next Step.
  4. MEASURE THE VOLTAGE ON THE (D402) LIN BUS 2 CIRCUIT 
    1. Turn the ignition off.
    2. If needed, disconnect the Left Rear Steering Wheel Switch harness connector.
    3. Turn the ignition on.
    4. Measure the voltage on the (D402) LIN Bus 2 circuit at the Left Rear Steering Wheel Switch harness connector.

      Is there any voltage present?

      Yes 

      • Go To  9.

      No 

      • Go To Next Step.
  5. MEASURE THE VOLTAGE ON THE (D402) LIN BUS 2 CIRCUIT AT THE CLOCKSPRING 
    1. Turn the ignition off.
    2. If needed, disconnect the Clockspring harness connector.
    3. Turn the ignition on.
    4. Measure the voltage on the (D402) LIN Bus 2 circuit at the Clockspring harness connector from the BCM.

      Is there any voltage present?

      Yes 

      • Go To  9.

      No 

      • Go To Next Step.
  6. CHECK THE (D402) LIN BUS 2 CIRCUIT FOR AN OPEN 
    1. Turn the ignition off.
    2. Disconnect the related BCM harness connector.
    3. Measure the resistance of the (D402) LIN Bus 2 circuit between the related BCM harness connector and the Clockspring harness connector.

      Is the resistance above 3.0 Ohms?

      Yes 

      • Repair the open in the (D402) LIN Bus 2 circuit.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To Next Step.
  7. CHECK THE (D402) LIN BUS 2 CIRCUIT FOR AN OPEN 
    1. Turn the ignition off.
    2. Disconnect the related BCM harness connector.
    3. Measure the resistance of the (D402) LIN Bus 2 circuit between the related Left Steering Wheel Switch harness connector and the Clockspring harness connector.

      Is the resistance above 3.0 Ohms?

      Yes 

      • Repair the open in the (D402) LIN Bus 2 circuit.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Replace the Clockspring in accordance with Service Information. Go to Next Step.
  8. CHECK THE (D402) LIN BUS 2 CIRCUIT FOR A SHORT TO GROUND 
    1. Check for continuity between ground and the (D402) LIN Bus 2 circuit at the Left Rear Steering Wheel Switch harness connector.

      Is there continuity between ground and the (D402) LIN Bus 2 circuit?

      Yes 

      • Repair the short to ground in the (D402) LIN Bus 2 circuit.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To Next Step.
  9. 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 

      No 

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