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 key. The control module is located in front of the right-hand wheel arch in the cargo compartment. 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)
• power Operated Tailgate Module (POT) (option)
• antennas in the external door handles and in the tailgate
• 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
• the remote keyless entry (TRX) receiver for signals from the keyless remote key.

When one of the external door handles is pulled outwards, the Keyless vehicle module (KVM) activates the antenna in the handle on the same side. A message is transmitted from the antenna to check whether there is a remote key with keyless entry function near the vehicle. The remote key responds to the Remote Keyless Entry (TRX) which forwards the information to the Keyless vehicle module (KVM).

If a remote key is found, the Keyless vehicle module (KVM) checks the remote key's identity. If the remote key is programmed for use in the vehicle, the Keyless vehicle module (KVM) activates the quick lock motor to open the door where the handle was pulled outwards. At the same time, the Keyless vehicle module (KVM) transmits a signal to the Central electronic module (CEM) stating that the key is approved and that the other doors can be unlocked. This function is controlled by the personal settings made in the Infotainment control module (ICM).