Keyless Vehicle Module (KVM)

Fig 1: Identifying Keyless Vehicle Module (KVM) (Only Vehicles With The Keyless Locking System)

Courtesy of VOLVO CARS CORPORATION

The keyless vehicle module (KVM) controls keyless entry to the vehicle. The system allows the vehicle to be opened without inserting a key in the lock or pressing a button on the remote control. The control module is under the left front seat. The keyless vehicle module (KVM) works together with the central electronic module (CEM) when opening and starting the vehicle. The two control modules communicate via the low speed side of the controller area network (CAN) (LS-CAN).

There are a number of components in the keyless entry system:

• keyless vehicle module (KVM)
• antennas in the external door handles and in the rear bumper
• antennas in the passenger compartment and cargo compartment
• quick lock motors connected to the standard lock motors
• switches in door handles, locking buttons and additional lock motors
• Remote Keyless Entry (RKE) for signals from the keyless remote control
• remote control including keyless entry function.

If one of the external door handles is pulled outwards, the keyless vehicle module (KVM) activates the antennas in the handles on that side. A message is transmitted from the antennas. The purpose of this message is to check whether there is a remote control with keyless functionality in the vicinity of the vehicle. The remote control responds to Remote Keyless Entry (RKE) that forwards information to the Keyless vehicle module (KVM). If a remote control is found, the Keyless vehicle module (KVM) controls the remote control's identity. If the remote control is programmed for use in the vehicle, the keyless vehicle module (KVM) will activate the quick lock motor to open the door on which the handle was pulled out. At the same time, the keyless vehicle module (KVM) transmits a signal to the central electronic module (CEM) indicating that the key is authorized and that the other doors can be unlocked.