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 SPORT, 4WD, PART TIMEREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTHEADLIGHTSCABIN COMPARTMENT NODE (CCN) - ELECTRICAL DIAGNOSTICSDTC TROUBLESHOOTINGB2181-HEATED SEAT MODULE POWER SUPPLY LOWDIAGNOSTIC TEST

2009 Jeep Liberty Sport, 4WD, Part Time

Diagnostic Test

2009 Jeep Liberty Sport, 4WD, Part TimeSECTION Diagnostic Test

CHECK FOR CHARGING SYSTEM DIAGNOSTIC TROUBLE CODES (DTCs)
1. Turn the ignition on.
2. With the scan tool, read Powertrain Control Module (PCM) / Engine Control Module (ECM) DTCs.
  Are there any Charging System DTCs set in the PCM?
  
  Yes
  - Refer to DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Diagnosis and Testing for gasoline engine applications
  No
  - Go to step 2
VERIFY DTC B2181-HEATED SEAT MODULE POWER SUPPLY LOW IS ACTIVE
1. With the scan tool, record and erase DTCs.
2. Turn the ignition off.
3. Start the engine and let it run for one minute.
4. With the scan tool, read DTCs.
  Does DTC B2181-HEATED SEAT MODULE POWER SUPPLY LOW reset?
  
  Yes
  - Go to step 3
  No
  - The conditions that caused this code to set are not present at this time. Verify that the seat harness is routed correctly to the HSM. 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. Attempt to reproduce condition by adjusting the seat.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
CHECK (P693) FUSED RUN RELAY OUTPUT CIRCUIT VOLTAGE

Fig 1: CHECKING FUSED RUN RELAY OUTPUT CIRCUIT VOLTAGE
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the HSM harness connector.
  NOTE: Check connectors - Clean and repair as necessary.
3. Start the engine.
4. Allow the engine to idle.
5. Measure the voltage of the (P693) Fused Run Relay Output circuit between the HSM connector and ground and compare it to the voltage at the vehicle battery.
  Is the voltage measured at the HSM connector the same as the voltage measured at the battery?
  
  Yes
  - Replace the Heated Seat Module (HSM) 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 (P693) Fused Run Relay Output circuit for the cause of the low voltage condition at the HSM.
  - 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.