Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSJEEP2009LIBERTY LIMITED, 4WD, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESCABIN COMPARTMENT NODE (CCN) - ELECTRICAL DIAGNOSTICSDTC TROUBLESHOOTINGU1008-LIN 1 BUSDIAGNOSTIC TEST

2009 Jeep Liberty Limited, 4WD, Automatic

Diagnostic Test

2009 Jeep Liberty Limited, 4WD, AutomaticSECTION Diagnostic Test

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 step 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.
SHORTED LIN BUS COMPONENT
NOTE: After disconnecting each component, check DTCs with the scan tool.
1. Turn the ignition on.
2. Disconnect the Compass Module harness connector.
3. Disconnect the Heated Seat Module harness connector.
4. Disconnect the Switch Bank harness connector.
5. Disconnect the Multifunction Switch harness connector.
6. Disconnect the Right Steering Wheel Switch harness connector.
  With each component disconnected, did the DTC U1008-LIN 1 BUS change from active to stored?
  
  Yes
  - Replace the component that caused the DTC U1008-LIN 1 BUS to change from active to stored.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
  No
  - Go to step 3
(D506) LIN BUS CIRCUIT OPEN

Fig 1: CHECKING LIN BUS CIRCUIT FOR OPEN
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Cluster C2 harness connector.
3. Disconnect the Switch Bank harness connector.
4. Measure the resistance of the (D506) LIN Bus circuit.
  Is the resistance above 10K Ohms?
  
  Yes
  - Repair the (D506) LIN Bus circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
  No
  - Go to step 4
(D506) LIN BUS CIRCUIT SHORTED TO GROUND

Fig 2: CHECKING LIN BUS CIRCUIT FOR SHORT TO GROUND
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Measure the resistance to ground on the (D506) LIN Bus circuit.
  Is the resistance below 10K Ohms?
  
  Yes
  - Repair the (D506) LIN Bus circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
  No
  - Replace the Cluster in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.