Keyless Entry System Description and Operation. Chevrolet Joy 2008

For 1990-2009 cars

### Remote Keyless Entry And Anti-Theft System

The remote keyless entry and anti-theft system can perform the following functions:

• | Remotely lock and unlock the vehicle doors with a hand-held high frequency transmitter.

• | Sense intrusion into the vehicle through the doors, the tailgate, or the hood.

• | Activate a warning to signal an intrusion.

• | Help the driver find the vehicle in a parking area.

• | Automatically relock the doors if a door or the trunk is not opened within 30 seconds after the vehicle has been unlocked by the remote keyless entry.

• | Communicate serial data to a scan tool to help diagnose system faults.

The remote keyless entry and anti-theft system consists of the following components:

• | Keyless entry and anti-theft control module/receiver

• | Security indicator

• | Tailgate open switch

• | Door open switches

• | Central locking unit

• | Flashing turn signal lamps

• | Siren

• | Hood open switch

### Remote Locking And Unlocking

The handheld transmitter locks and unlocks the vehicle doors by sending radio waves to the control module/receiver in the vehicle. The effective range of the transmitter varies between 5 and 10 meters (approximately 16 to 32 feet), depending on whether or not objects such as other vehicles are blocking the path of the radio waves.

The transmitter has a LOCK button and an UNLOCK button which only function when the ignition is OFF. Pressing the UNLOCK button has the following effects:

• | The doors are unlocked.

• | The turn signal lamps flash twice.

• | The control module is disarmed.

Pressing the LOCK button has the following effects:

• | The doors are locked.

• | The turn signal lamps flash once.

• | The control module is armed.

The transmitter has a replaceable battery. The battery is designed to last at least two years before replacement is necessary.

### Security Indicator

There is a security indicator on the instrument panel. After the LOCK button of the transmitter is pressed, the module is placed in the armed mode, and the security indicator flashes. The security indicator turns ON for 1/8 second and OFF for 7/8 second. It then flashes at that frequency until the control module/receiver is disarmed.

### Intrusion Sensing

The anti-theft function is armed if the transmitter sends the LOCK message to the control module/receiver when the ignition is OFF.

When the hood, the door, or the tailgate is opened, the hood open switch, the door open switch, or the tailgate open switch will change its input to ground. The alarm will be activated if the hood open sensor, the door open sensor, or the tailgate open sensor changes its input to ground before either of the following conditions occurs:

An UNLOCK message is received from the transmitter.

### Siren

The remote keyless entry system is armed when the LOCK message is received from the transmitter when the ignition is OFF. When the system is armed, it will activate the siren and flash the turn signals for 28 seconds if any of the following conditions occurs:

• | A door is opened (front door open switch input is changed to ground).

• | The tailgate is opened (tailgate open switch input is changed to ground).

• | The hood is opened while the anti-theft system is armed (hood open switch input is changed to ground).

The siren is disarmed when any of the following conditions occurs:

• | The ignition switch is turned ON with the key.

• | The UNLOCK button or the LOCK button on the remote transmitter is pressed.

### Vehicle Locator

The remote keyless entry system assists the driver in locating the vehicle. When the vehicle is unlocked with the remote control, the turn signals flash twice to indicate the location of the vehicle. The duration of the flashes and the length of time between flashes is used to indicate certain vehicle conditions. Refer to Fault or Alarm Indication in this section.

### Autolocking (Safety Lock)

The remote keyless entry system features an autolocking control. If the doors are unlocked with the remote transmitter when the control module/receiver is in the armed mode, the doors are automatically relocked after 30 seconds unless any of the following events occur:

• | The door is opened.

• | The ignition switch is turned ON.

• | The tailgate is opened.

• | The hood is opened.

### Control Module/Receiver

The remote keyless entry control module/receiver is contained in the tie bar center. The module/receiver processes signals from the remote transmitter and the intrusion sensors, and it activates the alarm if an intrusion is detected.

The control module/receiver will not communicate with transmitters from other vehicles because there are over four billion possible electronic password combinations, and passwords are not duplicated. The control module/receiver has an attached antenna to detect signals from the transmitter.

### Fault Or Alarm Indication

When the UNLOCK button on the remote transmitter is pressed, the control module/receiver will flash the parking lights to indicate information about the remote keyless entry and anti-theft system.

Normal Condition: If there has not been an intrusion, and no fault has been detected, the control module/receiver will signal a normal condition when the UNLOCK button is pressed. The parking lights will flash twice for 0.5 second, with a 0.5 second pause between flashes.

Fault Indication: If there is a fault in the remote keyless entry and anti-theft system, the control module/receiver will signal the fault when the UNLOCK button is pressed. The parking lights will flash twice for 1 second, with a 0.5 second pause between flashes.
Alarm Indication: If there has been an intrusion since the last time the LOCK button was pressed, the control module/receiver will signal that there has been an intrusion when the UNLOCK button is pressed. The parking lights will flash twice for 0.5 second, with a 1.5 second pause between flashes.

Alarm and fault information will be erased the next time the transmitter arms the control module/receiver by transmitting a LOCK message.