Power Door Lock System

When the BCM receives an input for a lock request (door lock switch, RKE, or door key cylinder switch (only with VTSS)), it will ground the lock relay coil for a specified amount of time ranging from 62 msec to 1 second. If the request is there beyond 1 second, the BCM considers the door lock signal stuck and will turn the relay coil off. Once a door lock signal is stuck, the signal input for that door is ignored until the stuck fault disappears. The unlock signal operates in the same fashion as the lock signal. The door lock switches provide a variable amount of resistance thereby dropping the voltage of the multiplexed (MUX) circuit and the BCM will respond to that command.

A new feature for this vehicle is the use of PTC's (Positive Temperature Coefficient devices) to protect the door lock circuits. When a short in one of the doors occurs, it also will cause one of more of the other doors to become inoperative.

Other power door lock features:

Sliding Door Memory Lock - When the BCM receives an input for a lock request and a sliding door is open, the BCM will turn on the lock relay as described above, and will turn it on again when all sliding doors are closed. NOTE: If the BCM receives an unlock input before a sliding door is closed this action will cancel the memory lock.

Door Lock Inhibit - When the key is in the ignition and in the off position, and any door except the rear liftgate is open, all door lock switches are disabled. The unlock switches are still functional. This protects against locking the vehicle with the keys still in the ignition.

Automatic Door Locks - This feature can be enabled or disabled by using either the DRBIII or the MDS machine. When enabled, all the doors will lock when the vehicle reaches a speed of 15 MPH and all doors are closed. If a door is opened and the vehicle slows to below 15 MPH, the door locks will operate again once all doors are closed and the speed is above 15 MPH.

RKE (Remote Keyless Entry) Interface - The body control module interfaces with the RKE receiver via a one-way serial bus interface. The RKE receiver sends a 0-5 volt pulse width signal to the BCM depending on which button on the transmitter was pressed. The BCM controls the door lock/unlock relays and arming/disarming of the Vehicle Theft Security System (if equipped). The RKE receiver is capable of retaining up to 4 individual vehicle access codes (4 transmitters). If the PRNDL is in any position except park, the BCM will ground the interface wire thereby disabling the RKE.

The RKE module can be programmed via the DRBIII, the Mopar Diagnostic System (MDS), or customer programming method. The BCM will only allow programming mode to be entered when the ignition is in the on position, the PRNDL is in park position, and the VTSS (if equipped) is in the disarmed mode.