Keyless Vehicle Module (KVM) (2006-2007): Function: Unlocking
Two micro-switches are closed if a door handles is pulled out. A switch in the handle closes first followed by a switch in the quick lock.
When the switch in the handles is closed, the keyless vehicle module (KVM) activates the antennas in the handles on the front and rear doors on the side on which the handles was pulled out. A request is transmitted via the antennas to the passive key. The key transmits an encrypted response which is received by the remote keyless entry (RKE) receiver. The remote keyless entry (RKE) receiver checks that the received signal is from a Volvo key. If it is, the message is forwarded to the keyless vehicle module (KVM). The keyless vehicle module (KVM) decrypts the signal and compares it with its own codes. If these correspond, the keyless vehicle module (KVM) transmits two signals. One signal is sent to the quick lock in the door, on which the handle was pulled out, to unlock and open the door. The other signal is transmitted to the central electronic module (CEM) which unlocks the other doors, depending on the system settings. The settings are:
- total unlocking
- selective unlocking.
In order for the keyless vehicle module (KVM) to activate the quick lock function, the handles must be pulled out far enough to close the switch in the lock unit.
A similar procedure to the above is carried out if the handle on the trunk lid or tailgate is acted on. However only the antenna in the rear bumper is activated to check the key. If selective unlock is set, only the trunk lid/tailgate is unlocked and opened. If total unlocking is selected, the side doors will also be unlocked if the switch on the tailgate/trunk lid is activated.