Principles of Operation

PRINCIPLES OF OPERATION

Power Locks
The SJB controls the power lock/unlock feature of all of the vehicle doors, including the liftgate, to lock or unlock based on the input received from the door lock control switch, the keyless entry keypad or the remote keyless entry (RKE) transmitter. Power locking and unlocking of the doors function independently of the key position, vehicle speed or transmission position. The smart junction box (SJB) activates internal relays to supply the correct voltage and grounds for the door lock actuators.

The liftgate window glass is released, using the keyless entry keypad or the RKE transmitter, and does not operate if the vehicle speed is greater than 5 km/h (3 mph), the battery is disconnected and then reconnected, or if the module is disconnected and then reconnected causing the liftgate window glass release switch to enter the disable mode. The liftgate window glass release switch is reset by unlocking all the doors.

Autolock
The autolock feature locks all the doors when all the doors, including the liftgate, are closed, after the brake pedal is pressed, and the vehicle speed exceeds 20 km/h (12 mph) or higher for a minimum of 2 seconds. This feature also relocks the doors (if any doors were open) after the brake pedal is pressed, once the SJB receives door closed inputs from all door ajar switches and vehicle speed exceeds 20 km/h (12 mph) for a minimum of 2 seconds. The autolock feature can be enabled/disabled through module configuration, the ignition switch, the message center (if equipped) and the keyless entry keypad. The autolock feature also uses inputs from the key position, the stoplamp switch and vehicle speed through the controller area network (CAN) from the anti-lock brake system (ABS) module.

Auto-Unlock
The auto-unlocking feature unlocks all the doors when all of the following conditions are met:
- all the doors are closed
- the key is in the run position and the vehicle was in motion at a speed greater than 20 km/h (12 mph) for a minimum of 2 seconds since the last key start. Then the vehicle comes to a stop and the key is turned to the OFF or ACCY position
- the driver door is opened within 10 minutes of the key being turned to the OFF or ACCY position

The doors do not auto-unlock if:
- the doors are locked using the door lock control switches.
- the doors are locked with the keyless entry keypad or the RKE transmitter within 10 minutes of turning the key to the ACC or OFF position.
- 10 minutes elapse and the driver door is not opened.

Smart Unlock
The smart unlock feature prevents the driver door from locking the vehicle with the key in the ignition lock cylinder. When the SJB receives a lock command from a door lock control switch, and the key is in the ignition lock cylinder (with the key in any position) with the one of the front doors open, the SJB commands the driver door to unlock.

Anti-Scan Feature
To provide added security, the keyless entry keypad is disabled for 1 minute after 35 button presses without a valid entry code being entered. The keyless entry keypad flashes during this 1-minute mode with all functionality disabled except for 7/8 and 9/0 still being allowed to lock the vehicle.

Anti-Scan is turned off after 1 minute of keyless entry keypad inactivity.

Unlocking the Doors and Liftgate with the Keyless Entry Keypad
To unlock the driver door, enter either the factory set code or a personal code; each digit must be pressed within 5 seconds of the prior digit. The interior lamps illuminate.

To unlock all doors, enter either the factory set code or a personal code (driver door unlocks) and press the 3/4 control within 5 seconds.

To open the liftgate window glass, enter the factory set code or a personal code (driver door unlocks) and press the 5/6 control within 5 seconds.

Remote Keyless Entry (RKE) Transmitter Lock/Unlock Control - Unlock
The RKE transmitter feature provides lock/unlock functions independently of key position, vehicle speed, or transmission position. The RKE transmitter feature provides a 2-step process for unlocking the doors. Upon receipt of the first request for unlocking the doors, the RKE control feature requests the SJB to unlock the driver door only. If another unlock request is received within 3 seconds of the first, the RKE transmitter feature requests the SJB to unlock all the doors. This feature can be changed to global unlock, so that all the doors unlock on the first press of the unlock button. To toggle between the 2-step unlock and the global unlock press the lock and the unlock button on the RKE transmitter at the same time and hold the buttons for 4 seconds. The turn signal lamps flash to confirm that the feature has been toggled.

Remote Keyless Entry (RKE) Transmitter Lock/Unlock Control - Lock
The RKE transmitter feature requests that all the doors be locked when the lock button is pressed. On any press of the lock button with all doors closed, the SJB provides 1 flash of the parking lamps. If any door is ajar, no flash occurs. As soon as the last door is closed, the SJB provides the flash of the parking lamps. If 2 presses of the lock button are received within 3 seconds, the horn chirps once, and the parking lamps flash twice to indicate that all the doors are closed and locked. If any door is ajar when the second lock request is received within 3 seconds of the first, the RKE transmitter feature requests the SJB chirp the horn twice without flashing the parking lamps to indicate it locked all the doors but 1 or more doors are ajar. When the key is in the ON or START position, the parking lamp flashes and horn chirp confirmations do not occur.

Panic Alarm
The panic alarm feature provides audible and visual alarms which are evident from the exterior of the vehicle. The panic alarm feature requests that the parking lamps are flashed and the horn sounds until deactivation. The flashing of the outputs occurs simultaneously. Activation of the panic alarm is accomplished by pressing the panic button on an RKE transmitter whenever the key is in the OFF or ACC positions. At all other times this feature is disabled. Deactivation of an active PANIC alarm is accomplished by any of the following actions:
- a second press of the RKE transmitter panic button.
- the key is switched out of the OFF or ACC position.
- a period of 2 minutes and 45 seconds has elapsed since the initial activation.

Keyless Entry Keypad
The keyless entry keypad, located on the exterior of the driver door, provides a method for customers to access their vehicle without a key or RKE transmitter. The keyless entry keypad feature:
- locks all doors.
- unlocks only the driver door.
- unlocks all doors.
- programs/erases the customer key codes.
- enables/disables auto-unlocking
- enables/disables autolocking.
- releases the liftgate window glass.

The keyless entry keypad feature operates independently of key position status, vehicle speed, or transmission position. When a keyless entry keypad button is pressed, the keyless entry keypad buttons illuminate to provide better visibility. If the lock all doors command is entered or 5 seconds have elapsed since the last button press, the illumination is turned off.

Each vehicle equipped with an keyless entry keypad is programmed with a 5-digit entry code. This code is provided to the customer through a wallet card in the Owner's Literature package. In addition, this code is available through a scan tool and is also printed on the SJB label. When entering codes each digit must be entered within 5 seconds of the previous button press.

Locking the Doors with the Keyless Entry Keypad
It is not necessary to enter the factory set or personal code prior to locking all doors. To lock all doors, press the 7/8 and 9/0 controls at the same time.