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 & EQUIPMENTENTERTAINMENT SYSTEMSPASSENGER DOOR MODULE (PDM) (DMFL/R) - ELECTRICAL DIAGNOSTICSDTC TROUBLESHOOTINGB16A4-PASSENGER WINDOW SWITCH BACKLIGHTING CIRCUIT LOWDIAGNOSTIC TEST

2009 Jeep Liberty Limited, 4WD, Automatic

Diagnostic Test

2009 Jeep Liberty Limited, 4WD, AutomaticSECTION Diagnostic Test

TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, record and erase DTCs
3. Ensure the passenger window lock out switch is on.
4. Turn the park lights on.
5. Wait 30 seconds.
6. With the scan tool, read DTCs.
  Does the scan tool display B16A4-PASSENGER WINDOW SWITCH BACKLIGHTING CIRCUIT LOW?
  
  Yes
  - Go to step 2
  No
  - The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
WINDOW/DOOR LOCK SWITCH SHORTED

Fig 1: CHECKING WINDOW/DOOR LOCK SWITCH FOR SHORT
Courtesy of CHRYSLER LLC
1. With the scan tool, erase DTCs.
2. Turn the ignition off.
3. Disconnect the Passenger Window/Door Lock Switch connector.
4. Ensure the passenger window lock out switch is on and the park lamps are still on.
5. Turn the ignition on.
6. With the scan tool, read DTCs.
  Does the scan tool display B16A4-PASSENGER WINDOW SWITCH BACKLIGHTING CIRCUIT LOW?
  
  No
  - Replace the Window/Door Lock Switch.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
  Yes
  - Go to step 3
(E34) PASSENGER WINDOW EXPRESS SWITCH ILLUMINATION DRIVER CIRCUIT SHORT TO GROUND

Fig 2: CHECKING PASSENGER WINDOW EXPRESS SWITCH ILLUMINATION DRIVER CIRCUIT FOR SHORT TO GROUND
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Turn the park lamps off.
3. Disconnect the Passenger Door Module C5 connector.
4. Measure the resistance between Ground and the (E34) Passenger Window Express Switch Illumination Driver circuit.
  Is the resistance below 10,000 ohms?
  
  Yes
  - Repair the (E34) Passenger Window Express Switch Illumination Driver circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
  No
  - Go to step 4
(E34) PASSENGER WINDOW EXPRESS SWITCH ILLUMINATION DRIVER CIRCUIT SHORT TO (Q936) PASSENGER WINDOW EXPRESS SWITCH RETURN

Fig 3: CHECKING PASSENGER WINDOW EXPRESS SWITCH ILLUMINATION DRIVER CIRUCIT FOR SHORT TO PASSENGER WINDOW EXPRESS SWITCH RETURN CIRCUIT
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (E34) Passenger Window Express Switch Illumination Driver circuit and the (Q936) Passenger Window Express Switch Return circuit.
  Is the resistance below 10,000 ohms?
  
  Yes
  - Repair the (E34) Passenger Window Express Switch Illumination Driver circuit for a short to the (Q936) Passenger Window Express Switch Return circuit.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
  No
  - Replace the Passenger Door Module 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.