Diagnostic Test

WARNING: This page is about a different car, the 2014 RAM 1500. 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 active communication DTC test's for the Radio Frequency Hub (RFH) Module before proceeding with this test.
1. Cycle the ignition on.
2. Using the scan tool, record and erase the DTCs.
3. Cycle the ignition off and wait 30 seconds.
4. Cycle the ignition on and attempt to start the engine.
5. If the engine started, wait 10 seconds then cycle the ignition off.
6. Cycle 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
  - 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 poor pin fit before proceeding.
CHECK THE (G20) IGNITION RUN/START SWITCH SENSE CIRCUIT
1. Cycle the ignition off.
2. Disconnect the RF Hub connector.
3. Cycle the ignition on.
4. Using a DVOM; at the RF Hub connector, check the (G20) Ignition Run/Start Switch Sense circuit for battery voltage. Compare the voltage to that of a direct connection to the battery.
  Is the voltage within 0.5 volts?
  
  Yes
  - Go to 3
  No
  - Repair the (G20) Ignition Run/Start Switch Sense circuit for an open/excessive resistance.
(G20) IGNITION RUN/START SWITCH SENSE CIRCUIT SHORTED TO VOLTAGE
1. Cycle the ignition off.
2. Disconnect the KIN/IGNM connector.
3. Disconnect the RF Hub connector.
4. 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.
  No
  - Go to 4
(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.
  No
  - Go to 5
CHECK THE RF HUB
1. If equipped with a Keyless Ignition Node (KIN), replace it in accordance with Service Information. Refer to MODULE, KEYLESS IGNITION NODE, REMOVAL . If equipped with an Ignition Node Module (IGNM), replace it in accordance with Service Information. Refer to REMOVAL .
2. Cycle the ignition on and attempt to start the engine.
3. If the engine started, wait 10 seconds then cycle the ignition off.
4. Cycle the ignition on.
5. 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 STANDARD PROCEDURE .
  No
  - Test complete.