Keyless Vehicle Module (KVM) (2008-10): Function: Unlocking
Two micro-switches are closed if a door handle is pulled out. A switch in the handle closes first followed by a switch in the quick lock.
When the contact breaker in the handle is closed, the keyless vehicle module (KVM) activates the antennas in the handle on the rear doors on the side on which the handle was pulled out. A request is transmitted via the antenna to the passive remote key. The remote key transmits an encrypted response which is received by the remote keyless entry (TRX) receiver. The remote keyless entry (TRX) receiver checks that the received signal is from a Volvo remote key. If it is, the message is forwarded to the keyless vehicle module (KVM). The keyless vehicle module (KVM) decrypts the signal and compares the received code from the remote key with its own programmed codes. If these correspond, the keyless vehicle module (KVM) transmits two signals. One signal is transmitted 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.
If the handle on the boot lid is affected, a similar procedure as above takes place. The difference is that only the outer antenna in the boot lid is activated to check the remote key.
If the setting for selective unlocking is selected, only the boot lid is unlocked and opened.
If the function for general unlocking is selected, the side doors also unlock when the switch on the boot lid is activated.