Locks: Description and Operation
POWER DOOR LOCKS / REMOTE KEYLESS ENTRY (RKE)POWER DOOR LOCKS
The Instrument Cluster in response to the door lock switches or the RKE module directly controls the power door lock motors. The Instrument Cluster monitors the activation of the door lock motors and will set diagnostic trouble codes when there is an open or short condition. When there is a lock or unlock input from a switch or RKE command, the Instrument Cluster will activate the appropriate driver for 300 milliseconds. If a lock or unlock switch remains active, the request will be ignored until the switch transitions back to OFF, The lock switches are resistive multiplexed input devices hardwired to the Instrument Cluster.
Body Control Module
Information Bus
Instrument Cluster / Carrier
Automatic Door Locks
The Instrument Cluster will automatically lock all the doors when the vehicle speed exceeds 15 MPH (24 KMH), throttle position exceeds 10 percent and all the doors are closed. If a door is opened the Automatic Door Lock feature shall reset and the Instrument Cluster will lock the doors when the above conditions are met. This feature is programmable by the customer or the DRB III.
Central Locking/Unlocking
The Instrument Cluster Will lock all doors when a cylinder lock switch is activated in the "lock" position. When the Instrument Cluster receives an unlock command from one of the cylinder lock switches, it will unlock only that door. If the Instrument Cluster receives a second command within a 5-second period it will unlock all the remaining doors. The illuminated entry will activate during door unlock.
Door Lock Inhibit
When the key is in the ignition, in any position, and either front door is open, the door lock switches LOCK functions are disabled. The UNLOCK functions are still functional. This protects against locking the vehicle with the keys still in the ignition. The RKE transmitter will still lock the doors as usual.
Enhanced Accident Response
Upon detection of an airbag deployment by way of the PCI bus, the Instrument Cluster shall:
* Immediately disable the power door lock output
* Unlock all doors by activating the door unlock output for approximately 300 milliseconds.
* After actuating the door unlock output, allow the door lock motors to be activated if the door lock input has been inactive (not erratic) for 2 seconds since the reception of the airbag deployment message.
REMOTE KEYLESS ENTRY (RKE)
The remote keyless entry (RKE) feature is used to control the power door locks and panic feature by using a remote transmitter (keylob) and receiver located within the instrument cluster. The instrument cluster RKE feature controls the driver door unlock, all doors lock/unlock, horn chirp enabled/disable, optical chirp enabled/disable, illuminated entry, the panic feature, initiate customer programming, and arming/disarming the Vehicle Theft Security System.
Body Control Module
Information Bus
Instrument Cluster / Carrier
When a valid lock message is received from the receiver, the instrument cluster will:
* Arm the Vehicle Theft Security System (if equipped and all conditions are met).
* Turn OFF the illuminated entry feature.
* Activate the door lock motors.
* Transmit a PCI bus message to the FCM to perform horn chirp.
When a valid unlock code is received from the receiver, the instrument cluster will:
* Disarm the Vehicle Theft Security System (if equipped and previously set).
* Activate the illuminated entry and cargo lamp.
* Activate the driver door unlock motor (if customer programmed for driver door only unlock).
* Transmit a PCI bus message to the FCM for optical chirp.