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, PART TIMEREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSWIRELESS CONTROL MODULE (WCM) - ELECTRICAL DIAGNOSTICSDTC TROUBLESHOOTINGB2211-RAIN SENSOR MODULE INITIALIZATION PERFORMANCEDIAGNOSTIC TEST

2009 Jeep Liberty Limited, 4WD, Part Time

Diagnostic Test

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

CHECK FOR DELAMINATION ON THE WINDSHIELD
1. Check the contact surface of the Rain Sensing Module to the windshield for delamination (this will resemble air bubbles in the contact area). Refer to: Wipers, Front, False Wipes. Refer to Electrical/Wipers/Washers - Diagnosis and Testing .
  Is delamination present on the windshield?
  
  Yes
  - Replace the windshield in accordance with the Service Information
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
  No
  - Go to step 2
TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, erase the DTCs.
3. Cycle the ignition from on to off three times.
4. Turn the ignition on and wait one minute.
5. With the scan tool, read the DTCs.
  NOTE: If the D508 LIN Bus circuit is shorted to Ground or Battery voltage, this code will appear as Stored and when erased will return as Stored.
  
  Does the scan tool display: B2211-RAIN SENSOR MODULE INITIALIZATION PERFORMANCE either Active or Stored?
  
  Yes
  - Go to step 3
  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 poor pin fit.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
(D508) LIN BUS CIRCUIT SHORTED TO GROUND

Fig 1: Checking LIN Bus Circuit Shorted To Ground
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Rain Sensor harness connector.
3. Measure the resistance between ground and the (D508) LIN Bus circuit in the rain sensor connector.
  Is the resistance below 20,000 Ohms?
  
  Yes
  - Go to step 5
  No
  - Go to step 4
(D508) LIN BUS CIRCUIT SHORTED TO BATTERY

Fig 2: Checking LIN Bus Circuit For Short To Battery
Courtesy of CHRYSLER LLC
1. Turn the ignition on.
2. Measure the voltage between the (D508) LIN Bus circuit and ground.
  NOTE: The voltage should fluctuate between approximately 7.0 and 9.8 volts.
  
  Is the voltage above 10.0 volts?
  
  Yes
  - Go to step 6
  No
  - Replace the Rain Sensor in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
(D508) LIN BUS WIRE SHORTED TO GROUND

Fig 3: Checking LIN Bus Circuit Shorted To Ground
Courtesy of CHRYSLER LLC
1. Disconnect the Wireless Control Module (WCM) harness connector.
2. Measure the resistance between ground and the (D508) LIN Bus circuit in the rain sensor connector.
  Is the resistance below 20,000 Ohms?
  
  Yes
  - Repair the (D508) 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 Wireless Control Module (WCM) in accordance with the Service Information.
  - Perform the WIRELESS CONTROL MODULE (WCM) VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
(D508) LIN BUS WIRE SHORTED TO BATTERY

Fig 4: Checking LIN Bus Circuit For Short To Battery
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Wireless Control Module (WCM) harness connector.
3. Turn the ignition on.
4. Measure the voltage between the (D508) LIN Bus circuit and ground.
  Is there any voltage present?
  
  Yes
  - Repair the LIN Bus wire for a short to voltage.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
  No
  - Replace the Wireless Control Module (WCM) in accordance with the Service Information.
  - Perform the WIRELESS CONTROL MODULE (WCM) VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Wireless Control (WCM) - 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.