Keyless Entry: Description and Operation

DESCRIPTION
Voltage is applied to the Keyless Entry Module through RH Circuit Breaker and the P/W Fuse at all times. The Keyless Entry Module controls the operation of the Power Door Locks, Courtesy Lamps and keyboard illumination by responding to switch inputs into the module.

LOCK OPERATION
The Power Door Locks may be locked from either Door Lock Switch. When either Switch is pressed toward the "LOCK" position, a ground signal is sent to the Keyless Entry Module via circuits PH10 (GN/O) and PH42 (GN/W). The Module then applies voltage to the Right Door Lock and Sliding Door Lock Actuators via circuits PH38 (W/R), PH46 (W/R) and PH31 (GN/Y). The module also applies voltage to the Left Door Lock Actuator Assembly and Liftgate Lock Actuator via circuits PH35 (W/G), PH32 (GN/O) and PH31 (GN/Y). All door lock actuators operate. If the sliding door is open, it does not lock because the circuit is open at the button connectors. If the sliding door is open, it does not lock because the circuit is open at the button connectors. If the sliding door is closed after the Door Lock Switch was pressed, the Module enters the sliding door lock delay mode. In this mode, the Module waits for the Sliding Door Ajar Switch to open, removing ground from circuits PB05 (BK/W) and LI79 (BK/W). The Module then applies voltage to the Right Door Lock and Sliding Door Lock Actuators via circuits PH38 (W/R), PH46 (W/R) and PH31 (GN/Y) to lock the sliding door. To lock all the doors using the Keyless Entry Keypad Assembly, press the "7/8" and "9/0" buttons at the same time. This grounds pins E and C of the Module. The Module then responds by applying voltage to the individual lock actuators as described above. The ignition key reminder circuits ER10 (BL/O) and PH03 (GN) must be open to ground (key out of ignition) in order to enable the locks to lock.

UNLOCK OPERATION
The Power Door Locks may be unlocked from the Keyless Entry Keypad Assembly, Left Door Lock Actuator Assembly or either Door Lock Switch. When either Door Lock Switch is pressed toward the unlock position, a ground signal is sent to the Keyless Entry Module via circuit PH19 (GN/O) and PH42 (GN/O). The Module then applies voltage to all door lock actuators in a manner similar to the locking action described above. When the key is used to unlock the driver's door, a ground signal is sent to the Keyless Entry Module via circuits PH11 (GN/R) and PB04 (GN/R). The Module then applies voltage to the door lock actuators in a manner similar to the locking action described in the preceding text. Unlocking individual groups of doors from the Keyless Entry Keypad Assembly is accomplished by pressing the corresponding Keyless Entry Keypad Assembly button within 5 seconds of unlocking the driver's door. When the "3/4" button is pressed the right and sliding doors receive voltage from the keyless entry module and voltage is applied to the respective lock actuators. When the "5/6" button is pressed, the Liftgate Door Lock Actuator receives voltage from the Keyless Entry Module.

SECURITY CODE OPERATION
A security code must be programmed into the Keyless Entry System before the keyless entry feature will operate. This is done by selecting a five digit code, entering the vehicle permanent entry code number and then entering the five digit code selected. The permanent entry code is located on the Keyless Entry Module, and on the owner's warranty card, on a label inside the glove box.

Pressing the keypad applies a ground signal to the Keyless Entry Module for each button pressed. The Keyless Entry Module then decodes the order of the buttons pressed to determine if the code entered is valid. If more than 15 buttons are pressed without entering the correct code, the Keyless Entry Module does not accept any keypad information for the next six seconds. If 35 more buttons are pressed after this sequence, the module does not accept any keypad information for the next 30 seconds. The module then looks at no more than 7 button inputs at a time, ignoring any more than that for the next 30 seconds until the correct code is entered.

The security code cannot be erased by disconnecting the vehicle battery. There are some numbers that are not accepted by the Keyless Entry Module. They include any sequential number, any 5 of the same digit and the permanent entry code.

KEYPAD ILLUMINATION
When the Keyless Entry Module receives a ground signal input from the Keyless Entry Keypad Assembly, voltage is applied to the Keyboard Illumination Lamp in the Keyless Entry Keypad Assembly. This lamp illuminates the keypad for a brief period of time.

KEYPAD TONE
The Keyless Entry Module applies a ground pulse to the keyless entry chime when a key is pressed and during the programming procedure. This causes the chime to chime.