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 MANUALSJEEP2009PATRIOT SPORT, 2.4 B, EDG, STANDARDREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTSEATS(CABIN COMPARTMENT NODE (CCN) - ELECTRICAL DIAGNOSTICS)DTC TROUBLESHOOTINGU113B-LOST COMMUNICATION WITH SWITCH BANK MODULEDIAGNOSTIC TEST

2009 Jeep Patriot Sport, 2.4 B, EDG, Standard

Diagnostic Test

2009 Jeep Patriot Sport, 2.4 B, EDG, StandardSECTION Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, record and erase DTCs.
3. Wait 30 seconds.
4. With the scan tool, read DTCs.
  Does the scan tool display: U113B-LOST COMMUNICATION WITH SWITCH BANK MODULE?
  
  Yes
  - Go to step 2
  No
  - The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
(D506) LIN BUS CIRCUIT OPEN

Fig 1: Checking LIN BUS Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Switch Bank harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (D506) LIN BUS circuit.
  Is the voltage above 5 volts?
  
  Yes
  - Go to step 3
  No
  - 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
(A935) FUSED B+ CIRCUIT OPEN

Fig 2: Checking Fused B+ Circuit
Courtesy of CHRYSLER LLC
1. Measure the voltage of the (A935) Fused B+ circuit.
  Is the voltage above 10 volts?
  
  Yes
  - Go to step 4
  No
  - Repair the (A935) Fused B+ circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
(Z940) GROUND CIRCUIT OPEN

Fig 3: Checking Ground Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (Z940) Ground circuit.
  Is the resistance below 10K ohms?
  
  Yes
  - Replace the Switch Bank in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
  No
  - Repair the (Z940) ground circuit for an open.
  - 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.