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Theft Deterrent Alarm Malfunction (Alarm Siren)

Theft Deterrent Alarm Malfunction (Alarm Siren)

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.


Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
B+

1

1

-

-

Signal

1

1

2

-

Ground

-

1

-

-

1. The power sounder is always OFF.

2. The power sounder is always ON.



Circuit/System Description

The alarm siren monitors the alarm enable signal circuit and will sound an audible alarm when the body control module indicates a event has occurred that requires an alarm. The alarm siren also monitors its own voltage circuits independent of the body control module. In the event of the interruption of voltage to the alarm siren, the alarm will sound.

Reference Information

Schematic Reference

Theft Deterrent System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Content Theft Deterrent (CTD) Description and Operation

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, command the Alarm Siren ON and OFF with a scan tool. The alarm siren should turn ON and OFF when changing between the commanded states.

Circuit/System Testing


1. Ignition OFF, disconnect the P25 power sounder.

2. Test for less than 10 Ω between the ground circuit terminal 4 and ground.

3. If greater than the specified range, test the ground circuit for an open/high resistance.

4. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.

5. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

6. If all circuits test normal, replace the P25 power sounder.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Theft Deterrent Alarm Replacement

• Control Module References for body control module replacement, setup, and programming