For a complete wiring diagram Refer to Section 8W.When Monitored:Continuously with the VTSS armed.Set Condition:If the ITM detects incorrect voltage at the siren this code will set.Possible CausesHARNESS TAMPERING / INTERMITTENT CONDITION (A412) FUSED B(+) CIRCUIT(Z905) GROUND OPENSIREN1. INSPECT SIREN HARNESSInspect the wiring harness to the siren for any signs of tampering or intermittent condition.Were there any problems found?YesRepair wiring as necessary.Perform BODY VERIFICATION TEST – VER 1(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE) No Go To 2 2. DETERMINING IF DTC IS CURRENTWith a scan tool, read and record DTC(s).With the scan tool, clear DTC(s).Turn the ignition off and remove the key from the ignition.Lock and close all doors to allow the VTSS to go from pre-arm to armed status and wait one minute.Disarm the VTSS.Using the scan tool, read ITM DTC(s).Does the DTC reset?Yes Go To 3NoDTC is not active at this time. Test complete.Perform BODY VERIFICATION TEST – VER 1(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE) 3. CHECK THE (A412) FUSED B(+) CIRCUIT AT THE SIREN

Turn the ignition off.Disconnect the Siren connector.Using a 12-volt test light connected to ground, check the (A412) Fused B(+) circuit at the siren connector. Does the test light illuminate brightly?YesGo To 4NoRepair the (A412) Fused B(+) circuit for an open.Perform BODY VERIFICATION TEST – VER 1(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE) 4. CHECK THE (Z905) GROUND CIRCUIT AT THE SIREN

Using a 12-volt test light connected to 12-volts, check the (Z905) Ground circuit at the siren connector. Does the test light illuminate brightly?YesReplace the Siren in accordance with the Service Information.Perform BODY VERIFICATION TEST – VER 1(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE) NoRepair the (Z905) Ground circuit for an open.Perform BODY VERIFICATION TEST – VER 1(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)