Diagnostic Test

WARNING: This page is about a different car, the 2021 Jeep Grand Cherokee L. 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. Turn the ignition off for a minimum of 10.0 seconds.
8. Start the vehicle
9. Press the brake pedal firmly and release.
10. With the scan tool, read BSCM DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - 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 and repair as necessary.
  - Perform the BSCM-INTERMITTENT CONDITION TEST. Refer to BSCM INTERMITTENT CONDITION .
INSPECT THE BRAKE SYSTEM
1. Turn the ignition off.
2. Check the brake fluid level.
3. Check the brake fluid for contaminants.
4. Visually inspect the brake reservoir mounting or damage.
5. Visually inspect all the brake lines for bent, damaged, or pinched restrictions.
  Where any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the BSCM VERIFICATION TEST. Refer to BSCM VERIFICATION TEST .
  No
  - Go To 3
CHECK FOR ELECTRONIC BRAKE BOOSTER RELATED DTCS
1. Refer to the recorded DTCs.
  Are there any Electronic Brake Booster related DTCs active?
  
  Yes
  - Perform the appropriate diagnostic procedures before continuing with this test. Refer to DIAGNOSTIC CODE INDEX .
  No
  - Go To 4
CHECK RELATED HARNESS CONNECTIONS
1. Turn the ignition off.
2. Disconnect the BSCM 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 BSCM 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 possible serious or fatal injury, 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 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 .