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 & EQUIPMENTCOMMUNICATION DEVICESINTRUSION TRANSCEIVER MODULE (ITM) - ELECTRICAL DIAGNOSTICSDTC TROUBLESHOOTINGU110D-LOST COMMUNICATION WITH SECURITY SIRENDIAGNOSTIC TEST
2009 Jeep Liberty Limited, 4WD, Automatic
Diagnostic Test
2009 Jeep Liberty Limited, 4WD, AutomaticSECTION Diagnostic Test
- INTERMITTENT DTC
- With the scan tool, erase the current Intrusion Transceiver Module DTCs.
- Turn the ignition off.
- Arm the VTSS and wait 1 minute.
- Disarm the VTSS and turn the ignition on.
Does the scan tool display the same DTC?
Yes
- Go To step 2
No
- The condition that caused this symptom is currently not present. Inspect the related wiring harness for a possible intermittent condition. Look for any chafed, pierced, pinched or partially broken wires.
- Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
- (A100) FUSED B+ OPEN
- Gain access to the VTSS Siren.
- Disconnect the Siren connector.
- Using a 12-volt test light connected to ground, check the (A100) Fused B(+) circuit in the Siren connector.
Does the test light illuminate brightly?
Yes
- Go To step 3
No
- Repair the (A100) Fused B+ circuit for an open.
- Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
- (Z908) GROUND CIRCUIT OPEN
- Using a 12-volt test light connected to 12-volts, check the (Z908) Ground circuit at the siren connector.
Does the test light illuminate brightly?
Yes
- Go To step 4
No
- Repair the (Z908) Ground circuit for an open.
- Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
- Using a 12-volt test light connected to 12-volts, check the (Z908) Ground circuit at the siren connector.
- FAULTY SIREN
- Use the DRBIII® and set up as follows:
- Use the Scope input cable CH7058, Cable to Probe adapter CH7062, and the red and black test probes.
- Connect the scope input cable to the channel one connector on the DRBIII®. Attach the red and black leads and the cable to probe adapter to the scope input cable.
- Select DRBIII® Stand-alone.
- Select lab scope.
- Select Live.
- Select 12 volt square wave.
- Press F2 for Scope.
- Press F2 and use the down arrow to set voltage range to 20 volts. Press F2 again when complete.
- Disconnect the Siren connector.
- Connect the black lead to the chassis ground. Connect the red lead to the (D96) Siren Signal Control circuit in the Siren connector.
- Close all doors and arm the VTSS.
- Observe the voltage displayed on the DRBIII® Lab Scope.
Is there a voltage square wave present 1 to 2 seconds?
Yes
- Connect a known good siren and try to reset the DTC. If the DTC does not reset the original siren needs to be replaced. If the DTC does reset replace the Intrusion Transceiver Module 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 5
- Use the DRBIII® and set up as follows:
- (D96) SIREN SIGNAL CONTROL CIRCUIT SHORT TO BATTERY
- Disconnect the Siren harness connector.
- Measure the voltage of the (D96) Siren Signal Control circuit.
Is there any voltage present?
Yes
- Repair the (D96) Siren Signal Control circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
No
- Go To step 6
- (D96) SIREN SIGNAL CONTROL CIRCUIT SHORT TO GROUND
- Disconnect the Siren harness connector.
- Disconnect the Intrusion Transceiver Module harness connector.
- Measure the resistance between ground and the (D96) Siren Signal Control circuit.
Is the resistance above 5.0 ohms?
Yes
- Go To step 7
No
- Repair the (D96) Siren Signal Control circuit for a short to ground.
- Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
- (D96) SIREN SIGNAL CONTROL CIRCUIT OPEN
- Disconnect the Intrusion Transceiver Module harness connector.
- Measure the resistance of the (D96) Siren Signal Control circuit between the Intrusion Transceiver Module and the Siren connector.
Is the resistance below 5.0 ohms?
Yes
- Replace the Intrusion Transceiver Module 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 (D96) Siren Signal Control 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.