Diagnostic Test

1. Turn the ignition on.
2. With the scan tool, read the Controller Area Network (CAN) topology on the Vehicle View screen.
   NOTE:

   This vehicle may be equipped with a CAN architecture using multiple CAN buses (i.e. CAN-BH, CAN-C1, CAN-C2, CAN-FD, CAN-IHS etc.) for communication with an ECU.

   Is the ECU active on all of the CAN buses connected to the ECU?

   Yes 

   • Perform the TESTING FOR AN INTERMITTENT CONDITION procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .

   No 

   • Go To  2

1. Turn the ignition off.
2. Connect a battery charger to the vehicle battery to maintain proper system voltage during this diagnostic procedure.
3. Leave the scan tool connected and on the Vehicle View screen. The CAN bus will remain active with the scan tool connected and the ignition off.
4. Using Dealer Connect, perform a Single VIN Inquiry.
5. Select the OPTIONS tab.
6. Review the information found under the Dealer Installed Equipment section.
   NOTE:

   This is to review the possibility of an Electronic Control Unit upgrade/addition (i.e. upgrading a Radio from a base to a Premium or the addition of a Rear Seat Video System).

   Does this vehicle have any Dealer Installed Equipment?

   Yes 

   • Go To  3

   No 

   • Go To  4

Is the Dealer Installed Equipment related to the ECU that is not active on the bus?

Yes 

• Contact Mopar Accessories for further technical and diagnostic support.

No 

• Go To  4

1. Check the fuse for an open. If the fuse is open, make sure to check for a short to ground prior to replacing the fuse.
2. The ignition must be off when performing a load test on a circuit.
3. Isolate the circuit(s) by disconnecting the Electronic Control Unit (ECU) and all other harness connectors containing the circuit(s) being tested.
4. Connect the positive lead of the load test tool to the positive side of the Battery (A). Refer to the diagram below.
5. Using an approved back probe tool, connect the negative lead of the load test tool to the circuit being tested at the ECU harness connectors (B).
6. Using an approved back probe tool and a fused jumper wire, connect the circuit being tested to the negative side of the Battery or a known good ground at the other ECU/Power Distribution Center (PDC) harness connector (C and D).
7. The bulb on the load test tool should be illuminated and bright if there is no resistance in the circuit.
   NOTE:

   Why load test a circuit?  A load test is used to determine if a circuit is capable of carrying the amperage needed to perform properly. The 3156 bulb in the load tool illustrated, is a simple but effective method of testing circuit functionality. A 3156 Bulb has approximately 6.0 Ohms of resistance when the bulb is powered  and draws approximately 2.0 amps of current. Read the CIRCUIT LOAD TESTING PROCEDURE for information on building a simple load test tool and for additional load testing information and alternative methods of load testing or voltage drop testing a circuit. Refer to CIRCUIT TESTING PROCEDURES .