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 INTERMITTENT CONDITION
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.

NOTE:
Perform any Radio Frequency Hub (RFH) Module LIN bus communication DTC's before continuing.
1. Turn the ignition on.
2. Using the scan tool, record and erase the DTCs.
3. Turn the ignition off and wait 30 seconds.
4. Turn the ignition on and attempt to start the engine.
5. If the engine started, wait 10 seconds then turn the ignition off.
6. Turn the ignition on.
7. Using the scan tool, read the active DTCs.
  Does the scan tool display the B1A7B-62-IMMOBILIZER ANTENNA (KIN/IGNM)-SIGNAL COMPARE FAILURE as an ACTIVE fault?
  
  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 .
(G20) IGNITION RUN / START SWITCH SENSE CIRCUIT SHORTED TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Ignition Node Module (IGNM) connector.
3. Check the G20 Ignition Run / Start Switch Sense circuit for a short to voltage.
  Is there any voltage present?
  
  Yes
  - Repair the (G20) Ignition Run / Start Switch Sense circuit for a short to voltage.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go to 3
(G20) IGNITION RUN / START SWITCH SENSE CIRCUIT SHORTED TO GROUND
1. Measure the resistance between ground and the (G20) Ignition Run / Start Switch Sense circuit.
  Is the resistance below 10K Ohms?
  
  Yes
  - Repair the (G20) Ignition Run / Start Switch Sense circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go to 4
CHECK THE (G20) IGNITION RUN / START SWITCH SENSE CIRCUIT
1. If equipped with a Keyless Ignition Node (KIN), replace it in accordance with Service Information. Refer to MODULE, KEYLESS IGNITION NODE (KIN), REMOVAL .
2. If equipped with an Ignition Node Module (IGNM), replace it in accordance with Service Information.
3. Turn the ignition on and attempt to start the engine.
4. If the engine started, wait 10 seconds then turn the ignition off.
5. Turn the ignition on.
6. Using the scan tool, read the active DTCs.
  Does the scan tool display the B1A7B-62-IMMOBILIZER ANTENNA (KIN/IGNM)-SIGNAL COMPARE FAILURE as an ACTIVE fault?
  
  Yes
  - 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 .
  No
  - Test complete. If the DTC ever repeats, replace the Keyless Ignition Node (KIN) or the Ignition Module (IGNM) in accordance with the Service Information. Refer to MODULE, KEYLESS IGNITION NODE (KIN), REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .