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.

TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
  NOTE:
  Make sure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.
2. Using the scan tool, select ECU View.
  NOTE:
  A red "X" will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.
  
  Does the scan tool display a red "X" next to the module?
  
  Yes
  - Go To Step 2
  No
  - The no response 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.
(A412) FUSED B(+) CIRCUIT OPEN OR SHORTED

Fig 1: Checking Fused B(+) Circuit For An Open Or Short
Courtesy of CHRYSLER GROUP, LLC

NOTE:
Leave the scan tool

connected

and on the initial network screen.
1. Turn the ignition off.
2. Disconnect the Wireless Control Module harness connector.
3. Using a 12-volt test light connected to ground, check the (A412) Fused B(+) circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To Step 3
  No
  - Repair the (A412) Fused B(+) circuit for an open or short.
  - Perform the WCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
(Z914) GROUND CIRCUIT OPEN

Fig 2: Checking Ground Circuit Using 12-Volt Test Light Connected To 12 Volts
Courtesy of CHRYSLER GROUP, LLC
1. Using a 12-volt test light connected to 12 volts, check the (Z914) ground circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To Step 4
  No
  - Repair the (Z914) ground circuit for an open.
  - Perform the WCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
(F20) FUSED IGNITION SWITCH OUTPUT (RUN/START) CIRCUIT OPEN OR SHORTED

Fig 3: Checking Fused Ignition Switch Output (Run/Start) Circuit Using 12-Volt Test Light Connected To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition on.
2. Using a 12-volt test light connected to ground, check the (F20) Fused Ignition Switch Output (Run/Start) circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To Step 5
  No
  - Repair the (F20) Fused Ignition Switch Output (Run/Start) circuit for an open or short.
  - Perform the WCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE CAN C BUS VOLTAGE AT THE MODULE
1. Turn the ignition off.
2. Using a DVOM measure the voltage of the (D65) CAN C Bus (+) circuit at the WCM harness connector and compare to Service Information. Refer to COMMUNICATION, OPERATION .
3. Using a DVOM measure the voltage of the (D64) CAN C Bus (-) circuit at the WCM harness connector and compare to Service Information. Refer to COMMUNICATION, OPERATION .
  Do the voltages found indicate the CAN C Bus is active, when compared to Service Information?
  
  Yes
  - Replace the Wireless Control Module in accordance with the Service Information.
  - Perform the WCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Repair the open or short in the (D65) CAN C Bus (+) or (D64) CAN C Bus (-) circuit. Inspect the connector for damage.
  - Perform the WCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .