For 1990-2009 cars

## 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
--- | --- | --- | --- | ---
Relay Coil B+ | 1 | 1 | -- | --
Relay Switch B+ | 1 | 1 | -- | --
Relay Coil Control | 1 | 1 | 1 | --
Relay Switch Control | 1 | 1 | 2 | --
1. Theft Deterrent Alarm Siren always OFF 2. Theft Deterrent Alarm Siren 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. Listen and feel for the KR101 theft deterrent alarm siren relay to turn ON and OFF.

### Circuit/System Testing

1. Ignition OFF, disconnect the KR101 theft deterrent alarm siren relay.
2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground.

⇒ | If the test lamp illuminates, test the control circuit for a short to voltage.

3. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.

⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test or replace the KR101 theft deterrent alarm siren relay.

4. Verify that a test lamp illuminates between the B+ circuit terminal 86 and ground.

⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal 85 for a short to ground. If the circuit tests normal, test or replace the KR101 theft deterrent alarm siren relay.

5. Disconnect the harness connector at the A619 alarm siren module.
6. Test for less than 5 Ω between the ground circuit terminal B and ground.

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

7. Connect the harness connector at the A619 alarm siren module.
8. Connect a 15 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the alarm siren is activated.

⇒ | If the alarm siren does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the A619 alarm siren module.

9. Connect a test lamp between the B+ circuit terminal 86 and the control circuit terminal 85.
10. Command the Alarm Siren ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K9 body control module.

⇒ | If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 body control module.

11. If all circuits test normal, test or replace the KR101 theft deterrent alarm siren relay.

### Component Testing

#### Relay Test

1. Ignition OFF, disconnect the KR101 theft deterrent alarm siren relay.
2. Test for 60 - 120 ohms between terminals 85 and 86.

⇒ | If not within the specified range, replace the KR101 theft deterrent alarm siren relay.

3. Test for infinite resistance between the following terminals:

• | 30 and 86

• | 30 and 87

• | 30 and 85

• | 85 and 87

⇒ | If not the specified value, replace the KR101 theft deterrent alarm siren relay.

4. Install a 15A fused jumper wire between relay terminal 85 and 12V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.

⇒ | If greater than the specified range, replace the KR101 theft deterrent alarm siren relay.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Theft Deterrent Alarm Replacement

• | for BCM replacement, setup, and programming

## Theft Deterrent Alarm Malfunction Power Sounder

### 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 1. The power sounder is always ON

### Circuit/System Description

The power sounder 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 power sounder also monitors its own voltage circuits independent of the body control module. In the event of the interruption of voltage to the power sounder, 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 with each command.

### Circuit/System Testing

1. Ignition OFF, disconnect the A620 power sounder content theft deterrent module.
2. Test for less than 10 Ω between the ground circuit terminal 4 and ground.

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

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

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

4. If all circuits test normal, replace the A620 power sounder content theft deterrent module.

### 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