Principles of Operation (How Does it Work?)
PRINCIPLES OF OPERATIONPower Lock
The power lock/unlock feature requests all of the vehicle doors, including the liftgate, be locked or unlocked upon a customer request from any interior door lock switch in the vehicle. The power door locking system functions independently of ignition status or vehicle speed. When the vehicle security module receives an unlock/lock command from any door lock control switch, the vehicle security module will activate relays internal to the module to supply the correct power and grounds for the door lock actuators.
Power Unlock Inhibit
With the ignition off, 20 seconds after electrically locked (remote transmitter, keypad, door lock control switch locked with door ajar) and all doors are closed, the door unlock switch will be inhibited if this feature is enabled. (The lock function will still operate.)
Deactivating/Activating Power Door Unlock Switch Inhibit
This is customer configurable. Steps one through three must be completed within 30 seconds.
1. Turn the key to ON, then press UNLOCK three times.
2. Turn the key to OFF. then press UNLOCK three times.
3. Turn the key to ON, within five seconds press LOCK two times.
The user should receive two horn chirps to indicate the system has been disabled or two chirps followed by a horn honk to indicate the system has been enabled.
Pressing LOCK two times again will toggle the door lock control switch inhibit feature state.
Turn the key to OFF to exit programming mode.
This feature can also be enabled/disabled using a diagnostic tool.
Auto-locking
The auto-locking feature locks all doors when all doors, including the liftgate, are closed, the brake pedal was pressed with the key in ON, then vehicle speed of 8 kph (5 mph) or higher was achieved. This feature relocks the doors (if any doors were open) after the brake pedal is pressed. Once all doors are read as closed and vehicle speed exceeds 8 kph (5 mph). Door ajar switches are wired directly to the vehicle security module. The auto-locking feature can be enabled/disabled through module configuration, diagnostics, keyless entry keypad and the ignition switch.
Auto-lock Enable/Disable - Using the keypad
A manual enable/disable mode allows the auto-lock feature to be turned off and on.
To enable or disable auto-lock using the keyless entry keypad:
1. Enter the five-digit permanent entry code into the keyless entry keypad.
2. Within five seconds of entering the code, press and hold the 7/8 button on the keypad.
3. Within five seconds of Step 2, and while holding the 7/8 button, press the 3/4 button on the keypad and release it.
4. Within five seconds of Step 3, release the 7/8 button on the keypad.
If the auto-lock feature is disabled, the horn will chirp once. If the auto-lock feature is enabled, the horn will chirp once shortly and then sound a second time for a longer sound of the horn once the above sequence is completed.
Auto-lock Enable/Disable - Using the Ignition Switch
Another way to turn the auto-lock feature off/on is by following this series of steps:
1. Close all doors.
2. Confirm that the key is in the OFF position.
3. Turn the key from OFF to ON.
4. NOTE: Steps 4 through 8 must be carried out within 30 seconds.
Press UNLOCK three times.
5. Turn the key from ON to OFF.
6. Press UNLOCK three times.
7. Turn the ignition switch from OFF to ON.
8. Verify that the horn chirps. This indicates the enable/disable mode and now is ready to accept program changes.
9. Press UNLOCK once to command the vehicle security module to toggle the auto-lock/relock feature OFF.
10. Press LOCK once to enter the command.
11. Verify that the horn chirps one time. There should only be one chirp indicating that the auto-lock/relock feature has been disabled. If one chirp is heard followed by a longer sound of the horn, the auto-lock/relock feature has just been enabled. Return to Step 10.
12. Turn the key to the OFF position to exit the enable/disable mode.
13. Exit the vehicle and verify that the horn chirps once to indicate that a feature has been changed and that auto-lock/relock has been disabled.
Smart Unlock
The smart unlock feature prevents the driver door from locking with the key in the ignition lock cylinder. When the vehicle security module receives a LOCK command from a door lock switch with the key in the ignition lock cylinder and the driver door open the vehicle security module will command the driver door to UNLOCK.
Remote Transmitter Lock/Unlock Control - Unlock
The remote control feature provides lock/unlock functions independently of ignition status, vehicle speed or transmission position. The remote control feature provides a two-step process for unlocking the doors. Upon receipt of the first requests for unlocking the doors, the remote control feature requests the vehicle security module to unlock the driver door only. If another unlock request is received within three seconds of the first, the remote control feature will request that all doors be unlocked.
Remote Transmitter Lock/Unlock Control - Lock
The remote control 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 remote control feature will request one flash of the parking lamps. If any door is ajar, no flash will occur, indicating it locked all the doors but one or more doors are ajar. As soon as the last door is closed, one flash of the parking lamps occurs. If two presses of the lock button are received within two seconds, the horn will chirp once, the parking lamps will 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 three seconds of the first, the remote control feature will request the horn chirp twice without flashing the parking lamps to indicate it locked all the doors but one or more doors are ajar. When the ignition is in the ON or START position, no parking lamp flashes or horn chirp confirmations will occur.
Panic Alarm
The panic alarm feature controls activation of the panic alarm providing audible and visual alarms which are evident from the exterior of the vehicle. The panic alarm feature requests that the parking lamps and horn are flashed until deactivation. The flashing of the outputs occurs synchronously. Activation of the panic alarm is accomplished by pressing the PANIC button on a remote transmitter whenever the key is OFF. At all other times this feature is disabled. Deactivation of an active PANIC alarm is accomplished by: a second press of the remote transmitter PANIC button, the ignition is switched out of the OFF or ACC position or a period of 2.75 minutes 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 the customer to access their vehicle without a key or remote transmitter. The keyless entry keypad feature:
- locks all doors and inhibits the door lock control switch UNLOCK capability after 20 seconds (if the inhibit feature is enabled).
- unlocks only the driver door.
- unlocks all doors.
- programs/erases customer key code.
- enables/disables auto-locking.
The keyless entry keypad feature operates independently of ignition status, vehicle speed, or transmission position. When a keypad button is depressed, the keypad buttons illuminate to provide better visibility. If 7/8 and 9/0 are pressed or five seconds have elapsed since the last button press, the illumination is turned off.
Each vehicle equipped with a keyless entry keypad is programmed with a five-digit entry code. This code is provided to the customer on a wallet card in the Owner literature package. In addition, this code is available through a diagnostic tool and is also printed on the vehicle security module label. When entering codes each digit must be entered within five seconds of the previous button press.
Programming/Erasing Personal Code
A unique personal five-digit code can be programmed by following these steps:
1. Enter the factory set five-digit code (the keypad will illuminate when pressed).
2. Press 1/2 within five seconds of Step 1.
3. Enter the unique five-digit code.
The personal code does not substitute for the permanent factory set code. Either code can be used to access the vehicle. In addition, if a second personal code is programmed, it will simply overwrite the previous personal code. To erase a personal code, carry out the following procedure:
4. Enter factory set five-digit code.
5. Press 1/2 within five seconds of Step 1.
6. Press 7/8 and 9/0 at the same time within five seconds of Step 2.
The system will now only respond to the factory set code.
Anti-Scan Feature
To provide added security, the keyless entry pad is disabled for one minute after 35 button presses without a valid entry code being entered. The keypad will flash during this one minute mode with all functionality disabled except for 7/8 and 9/0 still being allowed to lock the vehicle.
Anti-Scan will be turned off after any of the following events:
- one minute of keypad inactivity
- the remote transmitter UNLOCK button is pressed
- the key is turned to the ON position.
Unlocking the Doors with the Keyless Entry Keypad System
To unlock the driver door, enter either the factory set code or the personal code (each digit must be pressed within five seconds of the prior digit). The interior lamps will illuminate.
To unlock all doors, enter either the factory set code or the personal code (driver door unlocks) and press the 3/4 button within five seconds.
Locking the Doors with the Keyless Entry Keypad System
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 buttons at the same time.