Buick Regal: Symptoms - Immobilizer

IMPORTANT: The following steps must be completed before using the symptom tables.

1. Perform the Diagnostic System Check - Vehicle before using the symptom tables in order to verify that all of the following are true:

• There are no DTCs set.
• The control modules can communicate via the serial data links.

2. Review the system operation in order to familiarize yourself with the system functions. Refer to Immobilizer Description and Operation.

Visual/Physical Inspection

• Inspect for aftermarket devices which could affect the operation of the systems.
• Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections.

Symptom List

Refer to OnStar Stolen Vehicle Slowdown Active to diagnose the symptom.

ONSTAR STOLEN VEHICLE SLOWDOWN ACTIVE

Diagnostic Instructions

NOTE: This procedure is not used in Brazil.

• 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.

Circuit/System Description

When a remote slow-down request is sent from OnStar, the Telematics Communication Interface Control Module sends a serial data message to the engine control module (ECM) indicating that reduced vehicle speed has been requested. Once the request is active, the ECM begins reducing engine torque to match requested vehicle speed and the REDUCED ENGINE POWER message is displayed.

Reference Information

Schematic Reference

OnStar/Telematics Wiring Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEW INDEX

Master Electrical Component List

Description and Operation

Remote Vehicle Speed Limiting 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

1. Verify the vehicle is not in the OnStar initiated Stolen Vehicle Slow down mode. This can be accomplished by verifying the scan tool Telematics Enhanced Service Immobilization parameter is No.

• If the scan tool Telematics Enhanced Service Immobilization parameter is Yes

1. Perform the Remote Vehicle Speed Limiting Reset procedure with the scan tool.
2. Press the blue OnStar button and inform the advisor that you need to be transferred to the stolen vehicle team to update the vehicle account.

• Go to next step: If the scan tool BCM Telematics Enhanced Service Immobilization parameter is No

2. All OK.

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