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
NOTE:
This DTC must be active for the results of this test to be valid.
1. Perform any Service Bulletins that may apply.
2. Turn the ignition on.
3. For future reference, with the scan tool, run and save a vehicle Scan Report and all related recorded data.
4. With the scan tool, read DTCs and record on the repair order.
5. With the scan tool, read and record Environmental Data to help identify the conditions in which the DTC was set.
6. With the scan tool, erase all DTCs.
7. Cycle the ignition from off to on.
8. Press and hold the brake pedal.
9. Push the EPB Switch down to release the Electric Parking Brakes.
10. Pull the EPB Switch up to set the Electric Parking Brakes.
11. Push the EPB Switch down to release the Electric Parking Brakes.
12. Release the brake pedal.
13. Cycle the ignition from off to on.
14. With the scan tool, read BSCM DTCs.
  Did the DTC return?
  
  Yes
  - Go To Next Step.
  No
  - The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring harness and electrical connectors.
  - Perform the EPB VERIFICATION TEST. Refer to EPB VERIFICATION TEST .
CHECK THE PARKING BRAKE SWITCH CONNECTOR/TERMINAL FOR DAMAGE
NOTE:
Check all terminals for broken, bent, pushed out, or corroded terminals.
1. Turn the ignition off.
2. Inspect the Parking Brake Switch for debris or contamination.
3. Inspect the Parking Brake Switch for proper mounting.
4. Inspect the Parking Brake Switch for correct mechanical operation.
5. Inspect the Parking Brake Switch harness and connector.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the EPB VERIFICATION TEST. Refer to EPB VERIFICATION TEST .
  No
  - Go To Next Step.
REPLACE THE PARKING BRAKE SWITCH AND TEST FOR DTCS
1. Replace the Parking Brake Switch in accordance with the Service Information. Refer to ELECTRIC PARK BRAKE (EPB) SWITCH .
2. Perform the BSCM VERIFICATION TEST. Refer to BSCM VERIFICATION TEST .
3. Turn the ignition on.
4. With the scan tool, read BSCM DTCs and record on the vehicle repair order.
5. Cycle the ignition from off to on.
6. Press and hold the brake pedal.
7. Push the EPB Switch down to release the Electric Parking Brakes.
8. Pull the EPB Switch up to apply the Electric Parking Brakes.
9. Push the EPB Switch down to release the Electric Parking Brakes.
10. Release the brake pedal.
11. Cycle the ignition from off to on.
12. With the scan tool, read BSCM DTCs.
  Did the DTC return?
  
  Yes
  - Go To Next Step.
  No
  - Test complete.
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect the BSCM harness connector.
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. Connect the BSCM harness connector. Be certain that the harness connector is fully seated and the connector lock is fully engaged.
6. Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Connect the 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.
  WARNING:
  To avoid possible serious or fatal injury, check brake capability is available before road testing.
9. Using the recorded Event and 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 BSCM DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Brake System Control Module (BSCM) in accordance with the Service Information. Refer to MODULE, BRAKE SYSTEM CONTROL (BSCM), REMOVAL AND INSTALLATION .
  - Perform the BSCM VERIFICATION TEST. Refer to BSCM VERIFICATION TEST .
  No
  - The wiring or poor connection problem has been repaired.
  - Perform the BSCM VERIFICATION TEST. Refer to BSCM VERIFICATION TEST .