Diagnostic Test

WARNING: This page is about a different car, the 2016 Jeep Wrangler and 2015 Jeep Wrangler. However, it is still accessible from the selected car via links, so may be relevant.

VERIFY THE DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE
NOTE:
Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.
1. With the scan tool, read active DTCs.
  Is this DTC active?
  
  Yes
  - Go To 2
  No
  - Refer to DIAGNOSIS AND TESTING and perform the STORED LOST COMMUNICATION DTCS diagnostic procedure.
CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS
1. With the scan tool, read active DTCs from all modules.
  NOTE:
  Check for TIPM configuration, CAN Interior Bus hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.
  
  Does the scan tool display any active DTCs to the conditions listed above?
  
  Yes
  - Go to the DTC INDEX article and perform the appropriate diagnostic procedure.
  No
  - Go To 3
VERIFY THE HFM IS ACTIVE ON THE BUS
1. Turn the ignition on.
2. With the scan tool, view all modules.
3. Verify the HFM is active on the bus.
  Is the HFM active on the bus?
  
  Yes
  - Go To 4
  No
  - Refer to DIAGNOSIS AND TESTING and perform the NO RESPONSE FROM HFM diagnostic procedure.
CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS
1. With the scan tool, view all modules.
  Is there more than one module with active DTCs "Logged Against" the HFM?
  
  Yes
  - Replace/update the HFM in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 5
CLEAR DTC IN MODULE SETTING FAULT
1. With the scan tool, select the module setting the DTC against the HFM.
2. Clear active DTCs.
  Is this DTC still active?
  
  Yes
  - Replace/update the module that set this DTC in accordance with the Service Information.
  - Perform the appropriate verification test for the module being replaced. If there is no verification test for the associated module perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 6
CYCLE IGNITION
1. Cycle the ignition from RUN to OFF three times ending with the key in the RUN position.
  Does this DTC become active?
  
  Yes
  - Go To 7
  No
  - The condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK FOR ADDITIONAL LOST COMMUNICATION FAULTS
1. With the scan tool, view all modules.
  Does the TIPM and other CAN Interior BUS (125K) modules show any Lost Communication DTCs with the remaining CAN Interior BUS (125K) modules?
  
  Yes
  - Go To 8
  No
  - Replace/update the module that set this DTC in accordance with the Service Information.
  - Perform the appropriate verification test for the module being replaced. If there is no verification test for the associated module perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (D265) CAN INTERIOR BUS (+) (125K) CIRCUIT FOR A SHORT TO VOLTAGE

Fig 1: Checking CAN Interior BUS (+) Circuit For Short To Voltage
Courtesy of CHRYSLER GROUP, LLC
1. Measure the voltage between the (D265) CAN Interior Bus (+) (125K) circuit and ground.
  Is the voltage above 5.0 volts?
  
  Yes
  - Repair the short to voltage in the (D265) CAN Interior Bus (+) (125K) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 9
CHECK THE (D264) CAN INTERIOR BUS (-) (125K) CIRCUIT FOR A SHORT TO GROUND

Fig 2: Checking CAN Interior Bus (-) Circuit For Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Measure the resistance between ground and the (D264) CAN Interior Bus (-) (125K) circuit.
  Is the resistance below 10k Ohms?
  
  Yes
  - Repair the short to ground in the (D264) CAN Interior Bus (-) (125K) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Replace/update the module that set this DTC in accordance with the Service Information.
  - Perform the appropriate verification test for the module being replaced. If there is no verification test for the associated module perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .