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3. (Z904) GROUND CIRCUIT Using a 12-volt test light connected to 12-volts, check the (Z904) Does the test light illuminate brightly? Yes >> Go To 4 No >> Repair the (Z904) Ground circuit for an open. Perform BODY VERIFICATION TEST - 1A. (Refer to 8 - CONTROL MODULES - STANDARD PROCEDURE) 4. FAULTY SIREN Use the DRBIII T and set up as follows: Use the Scope input cable CH7058, Cable to Probe adapter CH7062, Connect the scope input cable to the channel one connector on the T . Attach the red and black leads and the cable to probe adapter to the scope input cable. Select DRBIII T 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. 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 Close all doors and arm the VTSS. Observe the voltage displayed on the DRBIII T 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 ITM. Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL No >> Go To 5 8Q - 116 VEHICLE THEFT SECURITY - ELECTRICAL DIAGNOSTICS LX |