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:
  Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.
2. With 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.
(A418) (A412) FUSED B(+) CIRCUIT OPEN OR SHORTED

Fig 1: Checking Each Fused B (+) Circuit Using 12-Volt Test Light Connected To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the Cluster C1, C2 and C3 harness connectors.
3. Using a 12-volt test light connected to ground, check each (A418) and (A412) Fused B(+) circuit.
  Does the test light illuminate brightly for each circuit?
  
  Yes
  - Go To Step 3
  No
  - Repair the Fused B(+) circuit for an open or short.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
(Z914) GROUND CIRCUIT OPEN

Fig 2: Checking Each 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 each (Z914) ground circuit.
  Does the test light illuminate brightly for each circuit?
  
  Yes
  - Go To Step 4
  No
  - Repair the (Z914) ground circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
(F943) FUSED RUN/START RELAY OUTPUT CIRCUIT OPEN OR SHORTED

Fig 3: Checking Fused Run/Start Relay Output 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 (F943) Fused Run/Start Relay Output circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To Step 5
  No
  - Repair the (F943) Fused Run/Start Relay Output circuit for an open or short.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
(D265) OR (D264) CAN C INTERIOR BUS (125K) CIRCUIT OPEN

Fig 4: Measuring Resistance Of CAN C Interior Bus (-/+) Circuits
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance of the (D264) CAN C Interior Bus (-) (125K) circuit between the TIPM C7 harness connector and the Cluster C2 harness connector.
2. Measure the resistance of the (D265) CAN C Interior Bus (+) (125K) circuit between the TIPM C7 harness connector and the Cluster C2 harness connector.
  Is resistance below 5.0 ohms on both circuits?
  
  Yes
  - Replace the Cluster in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Repair the (D265) or (D264) CAN C Interior Bus (125K) circuit for an open. Inspect the connector for damage.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .