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 DTC
1. With the scan tool, read Radio Frequency Hub (RF HUB) DTCs and record on the repair order.
2. With the scan tool, erase DTCs.
3. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
4. With the scan tool, read RF HUB DTCs.
  Did the DTC return?
  
  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.
CHECK THE (D920) PASSIVE ENTRY ANTENNA 1 SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Radio Frequency Hub C2 harness connector.
3. Turn the ignition on.
  NOTE:
  To turn the ignition on for the Passive Entry Keyless Go (PEKG)/Keyless Ignition Node (KIN) system when the RF Hub C2 connector is disconnected, use the rounded end of the FOBIK to press the Stop/Start button.
4. Measure the voltage between ground and the (D920) Passive Entry Antenna 1 Signal circuit at the Radio Frequency Hub C2 harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (D920) Passive Entry Antenna 1 Signal circuit for a short to voltage.
  No
  - Go To 3
CHECK THE (D921) PASSIVE ENTRY ANTENNA 1 RETURN CIRCUIT FOR A SHORT TO VOLTAGE
1. Measure the voltage between ground and the (D921) Passive Entry Antenna 1 Return circuit at the RF Hub C2 harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (D921) Passive Entry Antenna 1 Return circuit short to voltage.
  No
  - Replace the RF HUB in accordance with the Service Information. Refer to MODULE, RADIO FREQUENCY (RF HUB), REMOVAL .
  - Perform the RADIO FREQUENCY HUB (RF HUB) VERIFICATION TEST. Refer to RADIO FREQUENCY HUB (RF HUB) VERIFICATION TEST .