Keyless Vehicle Module (KVM)

Fig 1: Identifying Keyless Vehicle Module (KVM)

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 external door handles (C30/C70 front doors, S40/V50 rear doors) and in 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.

When one of the external door handles is pulled outward, Keyless vehicle module (KVM) activates the antennas in the handles (C30/C70 front doors, S40/V50 rear doors) on the corresponding side. A message is sent from the antennas and the purpose is to check if there is a remote control with keyless function by the vehicle. The remote control answer to Remote Keyless Entry (RKE) which transmits the information on to Keyless vehicle module (KVM). If a remote control is found, then Keyless vehicle module (KVM) checks the remote control's identity. If the remote control is programmed for use in the vehicle, Keyless vehicle module (KVM) will activate the quick-lock motor to open the door where the handle was pulled out. At the same time, Keyless vehicle module (KVM) sends a signal to Central electronic module (CEM) that the key is approved and that the other doors can be unlocked.