Diagnostic Test

Inspect the wiring harness to the siren for any signs of tampering or intermittent condition.

Were there any problems found? 

Yes 

1. Repair wiring as necessary.
2. Perform BODY VERIFICATION TEST - VER 1 (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

No 

1. Go To  2).

With 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 DTC(s).

Does the DTC reset? 

Yes 

1. Go To  3).

No 

1. DTC is not active at this time. Test complete.
2. Perform BODY VERIFICATION TEST - VER 1 (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

Fig 1: Checking Fused B(+) Circuit

Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Siren connector.

Using a 12-volt test light connected to ground, check the Fused B(+) circuit at the siren connector.

Does the test light illuminate brightly? 

Yes 

Go To step  4).

No 

1. Repair the Fused B(+) circuit for an open.
2. Perform BODY VERIFICATION TEST - VER 1 (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

Fig 2: Checking Ground Circuit At Siren Connector

Courtesy of DAIMLERCHRYSLER CORP.

Using a 12-volt test light connected to 12-volts, check the Ground circuit at the siren connector.

Does the test light illuminate brightly? 

Yes 

1. Replace the Siren in accordance with the Service Information.
2. Perform BODY VERIFICATION TEST - VER 1 (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

No 

1. Repair the Ground circuit for an open.
2. Perform BODY VERIFICATION TEST - VER 1 (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)