GM Service Manual Online
For 1990-2009 cars only

When armed, the content theft deterrent (CTD) system is designed to deter vehicle content theft by pulsing the horns and exterior lamps for approximately 30 seconds when an unauthorized vehicle entry is detected. However, the CTD system does not affect engine starting.

An unauthorized entry can be any of the following with the CTD system armed:

    • When any door or the rear compartment is opened without being first unlocked by an UNLOCK command from a keyless entry transmitter, a passive unlock from a keyless entry transmitter, or a manual unlock via the door key cylinder
    • Forced entry into engine compartment
    • After a battery reconnect, if the battery was disconnected with the CTD system armed

The components of the system are:

    • Rear integration module (RIM)
    • Instrument panel module (IPM)
    • Remote control door lock receiver (RCDLR)
    • Driver door module (DDM)
    • Front passenger door module (FPDM)
    • Left rear door module (LRDM)
    • Right rear door module (RRDM)
    • Hood ajar switch
    • Inclination sensor (RPO UA2)
    • Intrusion sensor (RPO UA2)
    • Theft deterrent alarm siren (RPO UA2)

Arming the CTD System

Use the following procedure in order to arm the system:

  1. Place the shift lever in PARK.
  2. Turn OFF the ignition.
  3. Exit the vehicle.
  4. Lock the doors with the LOCK button on the transmitter. The system is in standby mode and will not start the arming timer until all doors are closed.
  5. The system will begin the arm sequence immediately after the last door is closed. If the keyless entry transmitter is used to arm the system after the vehicle doors are closed, the arm sequence will begin as soon as the LOCK command is received by the transmitter. If selected through personalization, CTD arming may be done passively.

Locking The Vehicle Without Arming The CTD System

Locking the vehicle may be accomplished without arming the CTD system. Use of the manual door locks will lock the vehicle, but will not arm the CTD system.

Disarming An Armed System/Silencing An Alarm

If system arming has been requested by the power door lock switch or the transmitter, it must be disarmed.

Important: Using the power door unlock switch or manually unlocking the doors does not disable the CTD arm mode. Also, disconnecting the battery or pulling fuses does not disable the arm mode, since the BCM stores the CTD mode status in memory.

To disarm the CTD system, perform one of the following:

    • Press the UNLOCK button on the keyless entry transmitter .
    •  Enter the vehicle passively with a correct keyless entry transmitter.
    • Unlocking the vehicle using the door key cylinder
    • Pressing the Off/Acc/Start button with a valid key fob within the vehicle

CTD Circuit Description

The following is a description of each component used in the CTD system:

Rear Integration Module (RIM)

The CTD system is an internal function of the RIM which utilizes serial data and various switch inputs to perform CTD functions. When the RIM detects an unauthorized entry, it activates the horns and exterior lamps for 30 seconds. The system will re-arm immediately following an alarm event.

Instrument Panel Module (IPM)

The IPM is used by the CTD to control light and horn pulsing during the alarm mode. When CTD is in alarm mode, the RIM sends a serial data message to the IPM to pulse the lights and horn. Though the IPM is lighting master, it only physically controls the front vehicle lighting. When an alarm mode is received by the IPM, the IPM will send a serial data message to the RIM, which physically controls the rear vehicle lighting, to pulse the rear lamps.

Remote Control Door Lock Receiver (RCDLR)

The RCDLR receives input from the keyless entry transmitter, transferring information to the RIM via serial data. The RIM uses this information along with other information for activation and deactivation of the CTD system.

Door Modules

Each vehicle door has a respective door module. The door modules monitor each door ajar switch signal and communicates their status to the RIM via serial data. If CTD is in an armed state and a door ajar signal is received by the RIM from a door module, CTD will enter the alarm mode.

Hood Ajar Switch

The hood ajar switch is used to monitor unauthorized entry into the vehicles underhood area. The RIM monitors the hood ajar switch when in the armed mode. If the hood is seen to be ajar when the CTD is in the armed mode, CTD will enter the alarm mode.

Inclination Sensor (RPO UA2)

The inclination sensor is monitored by the RIM. The inclination sensor monitors the parked angle of the vehicle. Instances where vehicle angle may change is during jacking up of the vehicle or towing of the vehicle. If the CTD is in the armed mode and vehicle inclination is detected, CTD will enter the alarm mode.

Intrusion Sensor (RPO UA2)

The intrusion sensor is monitored by the RIM. The intrusion sensor is a shock sensor which monitors forceful entry or movement within the vehicle. This sensor is only equipped on vehicles with RPO UA2. If the CTD is in the armed mode and vehicle intrusion is detected, CTD will enter the alarm mode.

Theft Deterrent Alarm Siren (RPO UA2)

The theft deterrent alarm is a theft deterrent sounder used on some export vehicles. If the CTD System is in the alarm mode, the RIM will request the theft deterrent alarm ON.

Inputs

The RIM monitors the following inputs:

    • Door ajar switches, a serial data message from the door module
    • Passive vehicle locking, a serial data message from the RCDLR
    • Transmitter LOCK/UNLOCK buttons, a serial data message from the RCDLR
    • Rear compartment lid ajar switch
    • Hood ajar switch
    • Inclination sensor (RPO UA2)
    • Intrusion sensor (RPO UA2)

Outputs

The RIM controls the following outputs:

    • The horn relay
    • The exterior lamps
    • The theft deterrent alarm siren (RPO UA2)