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Home >> Dodge and Ram >> 2023 >> ProMaster 2500 >> Repair and Diagnosis >> Brakes >> Traction Control >> Antilock Brake System (Abs) - DTCS C1200-1C To C1409-01 >> DTC Troubleshooting >> C1405-01-Electric Park Brake Motor Left - General Electrical Failure >> Diagnostic Test

Diagnostic Test

  1. 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, erase all DTCs.
    6. Turn the ignition off for a minimum of 10.0 seconds.
    7. Press the brake pedal firmly and hold.
    8. Push the EPB Switch down to release the Electric Parking Brakes.
    9. Pull the EPB Switch up to set the Electric Parking Brakes.
    10. Push the EPB Switch down to release the Electric Parking Brakes.
    11. Release the brake pedal.
    12. Turn the ignition on.
    13. With the scan tool, read ABS DTCs.

      Did the DTC return?

      Yes 

      • Go To  2

      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 ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  2. CHECK HARNESS CONNECTORS FOR IMPROPER INSTALLATION, DAMAGE OR ELECTRICAL FAILURE 
    1. Turn the ignition off.
    2. Inspect the EPB Left Rear Actuator for proper mounting.
    3. Visually inspect the EPB Left Rear Actuator harness connector for Improper installation, damage or electrical failure.
    4. Visually inspect the EPB Switch harness connector for Improper installation, damage or electrical failure.
    5. Visually inspect the ABS Module harness connector for Improper installation, damage or electrical failure.

      Were any problems found?

      Yes 

      No 

      • Go To  3
  3. (F741) IGNITION RUN/START OUTPUT CIRCUIT OPEN 
    1. Disconnect the EPB Switch harness connector.
    2. Turn the ignition on.
      NOTE:

      The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

    3. With a 12-volt test light connected to ground, check the Ignition RUN/START Output circuit at the EPB Switch harness connector.

      Does the test light illuminate brightly?

      Yes 

      • Go To  4

      No 

      • Repair the Ignition RUN/START Output circuit for an open.
      • Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  4. (Z912) GROUND CIRCUIT OPEN 
    1. Turn the ignition off.
    2. With a 12-volt test light connected to 12 volts, check the (Z912) Ground circuit at the EPB Switch harness connector.

      Does the test light illuminate brightly?

      Yes 

      • Go To  5

      No 

      • Repair the Ground circuit for an open.
      • Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  5. REPLACE THE RIGHT REAR ELECTRIC PARKING BRAKE (EPB) ACTUATOR AND TEST FOR DTCS 
    1. Replace the Electric Parking Brake (EPB) Actuator in accordance with the Service Information. Refer to ACTUATOR, ELECTRIC PARK BRAKE, REMOVAL .
    2. Perform the EPB VERIFICATION TEST. Refer to EPB VERIFICATION TEST .
    3. Turn the ignition on.
    4. With the scan tool, read ABS DTCs.
    5. Cycle the ignition from off to on.
    6. Press the brake pedal firmly and hold.
    7. Push the EPB Switch down to release the Electric Parking Brakes.
    8. Pull the EPB Switch up to set the Electric Parking Brakes.
    9. Release the brake pedal.
    10. Press the brake pedal firmly and hold.
    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 ABS DTCs.

      Does the DTC remain active?

      Yes 

      • Go To  6

      No 

      • Test complete.
  6. CHECK RELATED HARNESS CONNECTIONS 
    1. Turn the ignition off.
    2. Disconnect the ABS Module harness connector.
    3. Disconnect all related in-line harness connections (if equipped).
    4. Disconnect the related component harness connectors.
    5. 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.

    6. Connect the ABS Module harness connector. Be certain that the harness connector is fully seated and the connector lock is fully engaged.
    7. Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. Connect the related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    9. With the scan tool, erase DTCs.
      WARNING:

      To avoid personal injury or death, check brake capability is available before road testing.

    10. 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.
    11. With the scan tool, read ABS Module DTCs.

      Did the DTC return?

      Yes 

      No 

      • The wiring or poor connection problem has been repaired.
      • Perform ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
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