For 1990-2009 cars

The theft deterrent system on this vehicle consists of the following two separate systems:

• | The Personal Automotive Security System (PASS-Key® II)

• | The Content Theft Deterrent (CTD) System

These systems are described and diagnosed separately within this section.

The PASS-Key® II is designed to help prevent vehicle theft. The PASS-Key® II disables the engine unless the driver uses a key with a specific electrical resistance in the ignition switch. The system consists of the following components:

• | The ignition key

• | The steering column (ignition) lock cylinder

• | The instrument cluster (SECURITY indicator)

• | The PASS-Key® II theft deterrent module

• | The Park/Neutral Position (PNP) switch

• | The theft deterrent relay

• | The powertrain control module (PCM)

The Content Theft Deterrent (CTD) system is designed to provide a warning in the event of a forced entry. The attempted forced entry may come through the doors. When a forced entry is attempted, the alarm warning system activates. The warning system causes the following actions to occur:

• | The horns sound intermittently.

• | The exterior lights flash in unison for approximately three minutes.

The CTD system consists of the following components:

• | The door lock actuator switches

• | The door lock cylinder switches

• | The door tamper switches (Buick)

• | The instrument cluster (SECURITY indicator)

• | The lamp control module (LCM)

• | The rear compartment lid tamper switch

• | The remote function actuator (RFA) module

The yellow SECURITY indicator in the instrument cluster is controlled by both the following systems:

• | In the PASS-Key® II system, the theft deterrent module controls the indicator only when the ignition switch is in RUN or START.

• | In the CTD system, the remote function actuator (RFA) module controls the indicator only when the ignition switch is OFF.

If the engine cranks but does not start, the PASS-Key® II system is not causing the problem. The content theft deterrent system does not affect the engine starting.