Diagnostic Test

1) INSPECT SIREN HARNESS
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 - BODY VERIFICATION TEST - VER 1) , also see (STANDARD PROCEDURE - PCM/ECM/SKREEM PROGRAMMING) .
No
1. Go To 2).
2) DETERMINING IF DTC IS CURRENT
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 - BODY VERIFICATION TEST - VER 1) , also see (STANDARD PROCEDURE - PCM/ECM/SKREEM PROGRAMMING) .
3) CHECK THE (A414) FUSED B(+) CIRCUIT AT THE SIREN

Fig 1: Checking Fused B(+) Circuit At Siren Connector For Open
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Siren connector.

Using a 12-volt test light connected to ground, check the (A414) Fused B(+) circuit at the siren connector.

Does the test light illuminate brightly?

Yes

Go To step 4).

No
1. Repair the (A414) Fused B(+) circuit for an open.
2. Perform BODY VERIFICATION TEST - VER 1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE - BODY VERIFICATION TEST - VER 1) , also see (STANDARD PROCEDURE - PCM/ECM/SKREEM PROGRAMMING) .
4) CHECK THE (Z902) GROUND CIRCUIT AT THE SIREN

Fig 2: Checking Ground Circuit At Siren Connector For Open
Courtesy of DAIMLERCHRYSLER CORP.

Using a 12-volt test light connected to 12-volts, check the (Z902) Ground circuit at the siren connector.

Does the test light illuminate brightly?

Yes
1. Replace the Siren. (Refer to SIREN - EXPORT) .
2. Perform BODY VERIFICATION TEST - VER 1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE - BODY VERIFICATION TEST - VER 1) , also see (STANDARD PROCEDURE - PCM/ECM/SKREEM PROGRAMMING) .
No
1. Repair the (Z902) Ground circuit for an open.
2. Perform BODY VERIFICATION TEST - VER 1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE - BODY VERIFICATION TEST - VER 1) , also see (STANDARD PROCEDURE - PCM/ECM/SKREEM PROGRAMMING) .