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)
1. Turn the ignition on.
2. With the scan tool, read Park Assist Module DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 2
  No
  - The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
VERIFY TCM IS ACTIVE ON THE CAN BUS
1. With the scan tool, select ECU View.
2. Verify that the TCM is active on the bus.
  Is the TCM active on the bus?
  
  Yes
  - Go To 3
  No
  - Refer to NO RESPONSE FROM TCM (TRANSMISSION CONTROL MODULE) and perform the No Response from TCM diagnostic procedure.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
DTCS STORED OR ACTIVE IN THE TCM
1. With the scan tool, read TCM DTCs.
  Are any DTCs active or stored in the TCM?
  
  Yes
  - Perform the appropriate diagnostic procedure.
  No
  - Go To 4
ACTIVE COMMUNICATION DTCS IN THE BCM
1. With the scan tool, select ECU View and select BCM.
2. With the scan tool, read active DTCs.
  Are any Communication DTCs active in the BCM?
  
  Yes
  - Refer to BODY CONTROL MODULE (BCM) - DIAGNOSTIC CODE INDEX and perform the appropriate diagnostic procedure.
  No
  - Replace and program the Park Assist Module in accordance with the Service Information. Refer to MODULE, PARK ASSIST, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .