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Home >> Jeep >> 2014 >> Wrangler Sahara, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 231 ((Cabin Compartment Node (CCN) - Electrical Diagnostics)) >> DTC Troubleshooting >> U1109-Lost Communication With Lin Steering Wheel Controls >> Diagnostic Test

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.
  1. CHECK FOR AN ACTIVE DTC 
    NOTE:

    Before proceeding with this diagnostic procedure, verify the Left and Right Multifunction Switch and Clockspring harness connectors are properly seated and verify proper pin terminal tension. A loose connection at any of these connectors may cause this DTC to set.

    1. Turn the ignition on.
    2. With the scan tool, read DTCs.

      Does the scan tool display this DTC as active?

      Yes 

      • Go To  2

      No 

      • Test complete, 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.
  2. CHECK THE (D506) LIN BUS CIRCUIT AT THE RIGHT STEERING WHEEL SWITCH (SPEED CONTROL SWITCH) 
    1. Turn the ignition off.
    2. Disconnect the Right Steering Wheel Switch (Speed Control Switch) harness connector.
    3. Turn the ignition on.
    4. Measure the voltage of the (D506) LIN Bus circuit.

      Is the voltage above 5.0 volts?

      Yes 

      • Go To  4

      No 

      • Go To  3
  3. CHECK THE (D506) LIN BUS CIRCUIT AT THE CLOCKSPRING 
    1. Turn the ignition off.
    2. Disconnect the Clockspring C2 harness connectors.
    3. Turn the ignition on.
    4. Measure the voltage of the (D506) LIN Bus circuit at both of the Clockspring harness connectors.

      Is the voltage above 5.0 volts?

      Yes 

      • Repair/replace the pigtail harness for an open between the Clockspring and the Right Steering Wheel Switch (Speed Control Switch) or replace the Clockspring in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Repair the (D506) LIN Bus circuit for an open.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  4. CHECK THE FUSED B (+) CIRCUIT AT THE RIGHT STEERING WHEEL SWITCH (SPEED CONTROL SWITCH) 
    1. Using a 12-volt test light connected to ground, check the Fused B (+) circuit at the Right Steering Wheel Switch (Speed Control Switch) 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 

      • Go To  6

      No 

      • Go To  5
  5. CHECK THE FUSED B (+) CIRCUIT OPEN BETWEEN THE CLOCKSPRING AND TOTALLY INTEGRATED POWER MODULE 
    1. Turn the ignition off.
    2. Disconnect the Clockspring C1 harness connector.
    3. Turn the ignition on.
    4. Using a 12-volt test light connected to ground, check the Fused B (+) circuit at the Clockspring C1 harness connector.

      Does the test light illuminate brightly?

      Yes 

      • Repair/replace the pigtail harness for an open between the Clockspring and the Right Steering Wheel Switch (Speed Control Switch) or replace the Clockspring in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Repair the Fused B (+) circuit for an open.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  6. CHECK THE GROUND CIRCUIT AT THE RIGHT STEERING WHEEL SWITCH (SPEED CONTROL SWITCH) 
    1. Turn the ignition off.
    2. Using a 12-volt test light connected to 12-volts, check the Ground circuit at the Right Steering Wheel Switch (Speed Control Switch) harness connector.

      Does the test light illuminate brightly?

      Yes 

      • Replace the Right Steering Wheel Switch (Speed Control Switch) in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  7
  7. CHECK THE GROUND CIRCUIT OPEN BETWEEN THE CLOCKSPRING AND GROUND 
    1. Disconnect the Clockspring C1 harness connector.
    2. Using a 12-volt test light connected to 12-volts, check the Ground circuit at the Clockspring C1 harness connector.

      Does the test light illuminate brightly?

      Yes 

      • Repair/replace the pigtail harness for an open between the Clockspring and the Right Steering Wheel Switch (Speed Control Switch) or replace the Clockspring in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Repair the Ground circuit for an open.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
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