Diagnostic Test

WARNING: This page is about a different car, the 2020 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
NOTE:
Verify that the battery is fully charged with a DVOM and use the scan tool to compare the Battery Voltage listed under "Data" in the RFH View to that of the BCM. If the battery is not fully charged, correct this condition before proceeding.
1. Turn the ignition on.
2. With the scan tool, create a Vehicle Scan Report and attach it to the repair order.
3. Try to start the engine.
4. With the scan tool, read RF HUB 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. If no problems are found, test complete.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (F20) IGNITION SWITCH OUTPUT CIRCUIT FOR AN OPEN/HIGH RESISTANCE
2. Turn the ignition off.
3. Disconnect the Radio Frequency Hub (RF Hub) C1 harness connector.
4. Disconnect the Body Control Module C8 harness connector.
5. Measure the resistance of the (F20) Ignition Switch Output wire between the Body Control Module C8 harness connector and the RF Hub C1 harness connector.
  Is the resistance below 2.0 Ohms?
  
  Yes
  - Replace the Radio Frequency Hub (RF Hub) Module in accordance with the Service Information. Refer to MODULE, RADIO FREQUENCY (RF HUB), REMOVAL .
  - Perform the RADIO FREQUENCY HUB VERIFICATION TEST. Refer to RADIO FREQUENCY HUB (RF HUB) VERIFICATION TEST .
  No
  - Repair the (F20) Ignition Switch Output circuit for an open/high resistance.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .