Diagnostic Procedure
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE - SIREN COMMUNICATION FAILURE
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 | With the DRBIII®, erase the current Intrusion Transceiver Module DTC's. Turn the ignition off. Arm the VTSS and wait 1 minute. Disarm the VTSS and turn the ignition on. Does the DRBIII® display the same DTC? Yes --> Go To 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 BODY VERIFICATION TEST - VER 1 . |
All |
| 2 | Gain access to the VTSS Siren. Disconnect the Siren connector. Measure the voltage of the Fused B(+) circuit in the Siren connector. Is the voltage above 10.0 volts? Yes --> Go To 3 No --> Repair the Fused B+ circuit for an open. Perform BODY VERIFICATION TEST - VER 1 . |
All |
| 3 | Disconnect the Siren connector. Using a 12-volt test light connected to 12-volts, check the ground circuit. Does the test light illuminate brightly? Yes --> Go To 4 No --> Repair the ground circuit for an open. Perform VTSS VERIFICATION TEST - 1A . |
All |
| 4 | 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® Standalone. 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 Siren Signal Control circuit in the Siren connector. Start the engine and hold the engine RPM's above 600. Observe the voltage displayed on the DRBIII® Lab Scope. Is there a voltage square wave present 1 to 2 seconds? Yes --> Replace the VTSS Siren. Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 5 |
All |
| 5 | Disconnect the Siren harness connector. Disconnect the Intrusion Transceiver Module harness connector. Measure the resistance between ground and the Siren Signal Control circuit. Is the resistance above 5.0 ohms? Yes --> Go To 6 No --> Repair the Siren Signal Control circuit for a short to ground. Perform VTSS VERIFICATION TEST - 1A . |
All |
| 6 | Disconnect the Siren harness connector. Disconnect the Intrusion Transceiver Module harness connector. Measure the resistance of the 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. Perform BODY VERIFICATION TEST - VER 1 . No --> Repair the Siren Signal Control circuit for an open. Perform VTSS VERIFICATION TEST - 1A . |
All |