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
NOTE:
Verify that the vehicle's 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 vehicle's battery is not fully charged, correct this condition before proceeding.

NOTE:
Before proceeding, check the handle for any foreign material, or binding, that could cause a sticking situation to the handle or switch.
1. Turn the ignition on and leave on until instructed to "Turn the ignition off".
2. With the scan tool, create a Vehicle Scan Report and attach it to the repair order.
3. With the scan tool, select: "RFH" and "System Tests".
4. Perform the Door Handle Verification Test. This will activate the Module to retest for DTCs.
5. With the scan tool, read the Active DTCs and wait one (1) minute.
  Is the DTC active?
  
  Yes
  
  NOTE:
  Verify that the magnet is present in the Door Handle Cap. If the magnet is present, then continue with the diagnostic procedure. If the magnet is NOT present, replace the Door Handle Cap first.
  - 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 (P125) DRIVER PASSIVE ENTRY HANDLE SWITCH SENSE CIRCUIT
1. With the scan tool, select "RFH", "Data" and scroll to "Left Front Door Handle Power".
2. Observe the Value field.
  What does the Value field display?
  
  OFF
  - Go To 3
  ON
  - Go To 8
CHECK THE (P125) DRIVER PASSIVE ENTRY HANDLE SWITCH SENSE CIRCUIT
1. With the scan tool, select "Diagnostic Procedures", "Reset ECU" and "RFH" and perform the routine.
2. With the scan tool, select "RFH", "Data" and scroll to "Left Front Door Handle Power".
3. Double click on the Value field to start the graph.
4. Observe the graph for a pulsating line.
  Is the graph pulsating between high and low on the screen?
  
  Yes
  - Go To 4
  No
  - Go To 7
DRIVER EXTERIOR DOOR HANDLE (PASSIVE ENTRY)
1. Turn the ignition off.
2. Disconnect the Driver Exterior Door Handle Switch harness connector. Refer to HANDLE, INTERIOR, REMOVAL .
3. Turn the ignition on.
4. With the scan tool, select "Diagnostic Procedures", "Reset ECU" and "RFH" and perform the routine.
5. With the scan tool, select "RFH", "Data" and scroll to "Left Front Door Handle Power".
6. Double click on the Value field to start the graph.
7. Observe the graph for a pulsating line.
  Is the graph pulsating between high and low on the screen?
  
  Yes
  - Go To 5
  No
  - Replace the Driver External Door Handle. Refer to HANDLE, INTERIOR, INSTALLATION .
  - With the scan tool, select "Diagnostic Procedures", "Reset ECU" and "RFH" and perform the routine.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (P125) DRIVER PASSIVE HANDLE SWITCH SENSE CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the Radio Frequency Hub (RF Hub) Module C2 harness connector.
3. Check the connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension. Repair as necessary. If repairs were made, return to Step. Refer to 1.
4. Check for continuity between ground and the (P125) Driver Passive Handle Switch Sense circuit at the Handle Switch harness connector.
  Is there continuity between ground and the (P125) Driver Passive Handle Switch Sense circuit?
  
  Yes
  - Repair the (P125) Driver Passive Handle Switch Sense circuit for a short to ground.
  - With the scan tool, select "Diagnostic Procedures", "Reset ECU" and "RFH" and perform the routine.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 6
CHECK THE (P125) DRIVER PASSIVE HANDLE SWITCH SENSE CIRCUIT FOR A SHORT TO THE (P124) DRIVER PASSIVE HANDLE SWITCH RETURN CIRCUIT
1. Check for continuity between the (P125) Driver Passive Handle Switch Sense circuit and the (P124) Driver Passive Handle Switch Return circuit at the Handle Switch harness connector.
  Is there continuity between the (P125) Driver Passive Handle Switch Sense circuit and the (P124) Driver Passive Handle Switch Return circuit?
  
  Yes
  - Repair the (P125) Driver Passive Handle Switch Sense circuit for a short to the (P124) Driver Passive Handle Switch Return circuit.
  - With the scan tool, select "Diagnostic Procedures", "Reset ECU" and "RFH" and perform the routine.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - 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 .
CHECK THE RF HUB
1. Continue with the scan tool still on "Left Front Door Handle Power".
2. Observe the Value field.
  What does the Value field display?
  
  OFF
  - 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 .
  ON
  - 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 DRIVER PASSIVE ENTRY HANDLE SWITCH
1. Continue with the scan tool still on "Left Front Door Handle Power".
2. Double click on the Value field to start the graph.
3. Observe the graph for a pulsating line.
  Is the graph pulsating between high and low on the screen?
  
  Yes
  - Go To 4
  No
  - Go To 9
TEST HANDLE FUNCTIONS
1. Stop the graph.
2. Lower the driver door window.
3. Turn the ignition off, remove the FOBIK and close all doors.
4. With the scan tool, select "RFH", "Data" and scroll to "Passive Entry Function Carried Out".
5. Have the FOBIK within 1.5 m (5 ft.) of the driver door handle.
  NOTE:
  In the next steps, wait two (2) seconds between each Lock and Unlock activation as there is a two second delay after each Lock action.
6. Press the Lock button on the handle and observe the screen for "Passive lock at left front door".
7. Grab the door handle and observe the screen for "Passive entry at left front door".
8. Repeat steps 6 and 7 two more times.
  Is the Module receiving the inputs on the screen as you do them?
  
  Yes
  - 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 .
  No
  - Go To 10
HANDLE OR CIRCUIT PROBLEM
1. Disconnect the Driver Exterior Door Handle Switch harness connector. Refer to HANDLE, INTERIOR, REMOVAL .
2. Measure the voltage between the (P124) Driver Passive Handle Switch Return and the (P125) Driver Passive Handle Sense circuits in the Driver Exterior Door Handle Switch connector.
  Is the voltage above 11.8 volts?
  
  Yes
  - Replace the Driver External Door Handle in accordance with the Service Information. Refer to HANDLE, INTERIOR, INSTALLATION .
  - With the scan tool, select "Diagnostic Procedures", "Reset ECU" and "RFH" and perform the routine.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 11
CHECK THE (P124) DRIVER PASSIVE HANDLE SWITCH RETURN CIRCUIT
1. Check for continuity between ground and the (P124) Driver Passive Handle Switch Return circuit at the Driver Exterior Door Handle Switch harness connector.
  Is there continuity between ground and the (P124) Driver Passive Handle Switch Return circuit?
  
  Yes
  - Go To 14
  No
  - Go To 12
CHECK THE (P124) DRIVER PASSIVE HANDLE SWITCH RETURN CIRCUIT FOR AN OPEN
1. Disconnect the Radio Frequency Hub (RF Hub) Module C2 harness connector.
2. Check the connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension. Repair as necessary. If repairs were made, return to Step. Refer to 1.
3. Measure the resistance of the (P124) Driver Passive Handle Switch Return circuit between the RF Hub Module C2 harness connector and the Driver Exterior Door Handle Switch harness connector.
  Is the resistance below 2.0 Ohms?
  
  Yes
  - Go To 13
  No
  - Repair the (P124) Driver Passive Handle Switch Return circuit for an open.
  - With the scan tool, select "Diagnostic Procedures", "Reset ECU" and "RFH" and perform the routine.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE GROUND CIRCUIT FOR AN OPEN
1. Disconnect the Radio Frequency Hub (RF Hub) Module C1 harness connector.
2. Check the connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension. Repair as necessary. If repairs were made, return to Step. Refer to 1.
3. Using a 12-volt test light connected to 12-volts, check the RF-Hub Ground circuit in the C1 harness connector.
  NOTE:
  The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
  
  Does the test light illuminate brightly?
  
  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 RF-Hub Ground circuit for an open.
  - With the scan tool, select "Diagnostic Procedures", "Reset ECU" and "RFH" and perform the routine.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (P125) DRIVER PASSIVE HANDLE SWITCH SENSE CIRCUIT FOR AN OPEN
1. Disconnect the RF Hub Module C2 harness connector.
2. Check the connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension. Repair as necessary. If repairs were made, return to Step. Refer to 1.
3. Measure the resistance of the (P125) Driver Passive Handle Switch Sense wire between the RF Hub C2 harness connector and the Driver Exterior Door Handle Switch harness connector.
  Is the resistance below 2.0 Ohms?
  
  Yes
  - Go To 15
  No
  - Repair the (P125) Driver Passive Handle Sense circuit for an open.
  - With the scan tool, select "Diagnostic Procedures", "Reset ECU" and "RFH" and perform the routine.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (P125) DRIVER PASSIVE HANDLE SWITCH SENSE CIRCUIT FOR A SHORT TO VOLTAGE
1. Measure the voltage between ground and the (P125) Driver Passive Handle Switch Sense circuit in the C2 harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (P125) Driver Passive Handle Sense circuit for a short to voltage.
  - With the scan tool, select "Diagnostic Procedures", "Reset ECU" and "RFH" and perform the routine.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - 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 .