Diagnostic Test

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DIAGNOSTIC TROUBLE CODE (DTC)
NOTE:
Before proceeding with this diagnostic procedure, remove any ice, snow, mud, dirt, or other obstructions from the front/rear fascia/bumper. Also remove any ice, snow, dirt, mud, or other obstructions from the underside of the Fascia/Bumper surrounding the sensors.
1. Turn the ignition on.
2. With the scan tool, read Park Assist Module (PAM) DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 2
  No
  - Test complete, 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.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
REMOVE SENSOR TO CLEAN AND RETEST FOR DTCS
1. Turn the ignition off.
2. Remove the park sensor in accordance with the Service Information. Refer to SENSOR, PARK ASSIST, REMOVAL .
3. Clean park sensor and mounting brackets
4. Install the park sensor and connect all harness connectors.
5. Turn the ignition on.
6. With the scan tool, erase all DTCs.
7. Turn the ignition off for a minimum of 10.0 seconds.
8. Turn the ignition on.
9. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
10. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Replace the park sensor in accordance with the Service Information. Refer to SENSOR, PARK ASSIST, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Cleaning the park sensor repaired the fault.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .