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 DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTENTERTAINMENT SYSTEMSDRIVER DOOR MODULE (DDM) (DMFL/R) - ELECTRICAL DIAGNOSTICS - LIBERTYDTC TROUBLESHOOTINGU113D-LOST COMMUNICATION WITH MASTER POWER WINDOW SWITCHDIAGNOSTIC TEST
2009 Jeep Liberty Limited, 4WD, Part Time
Diagnostic Test
2009 Jeep Liberty Limited, 4WD, Part TimeSECTION Diagnostic Test
- TEST FOR INTERMITTENT CONDITION NOTE: If the scan tool displays any other power window DTCs, repair them first before continuing.
- Turn the ignition on.
- With the scan tool, record and erase the DTCs
- Try to operate the Front Windows up and down several times.
- Wait 30 seconds.
- With the scan tool, read the DTCs.
Does the scan tool display: U113D-LOST COMMUNICATION WITH MASTER POWER WINDOW SWITCH?
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 .
- (A855) FUSED B(+) CIRCUIT OPEN NOTE: Make sure Fuse M26 in the TIPM is good before proceeding.
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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.