Technical Description and User’s Manual of the Volvo Tag ID w. Motion Sensor
MPD-WEU / M. Diekers Page 3 von 6 02.05.2019
1 General operation of the key
The Volvo Tag ID has a HF transmitter and a motion sensor implemented. It only works based on a bi-
directional communication when Keyless Entry & Start functionality is triggering via a LF Wake Up com-
mand issued by the vehicles antennas and the Tag ID responds in HF. The Volvo Tag ID has no buttons
and only is available at vehicles with Keyless Entry & Start functionality.
With Keyless Entry or Start both Volvo Tag ID reacts on a LF Wake Up-Signal from the vehicle (initiated
after activating of the sensor of the vehicle, i.e. at sensor at the door handle or the Push Start Button,
which recognizes the wish to lock/ unlock the vehicle or to open the trunk or to start the vehicle) from the
vehicle and after that the Volvo SPA Tag ID responds in HF on the RKE frequency for autorization pur-
poses. When the authorization is successful the vehicle performs the desired action.
In general the following functions are provided:
- Lock the car (with Keyless Entry functionality)
- Unlock the car (with Keyless Entry functionality)
- Open/Close the trunk of the car (with Keyless Entry functionality)
- Engine Start of the vehicle (with Keyless Start functionality)
When the battery power is too low, the Volvo SPA Tag ID can start the vehilce with the emergency back
up function via the LF-Transponder interface @134,2 kHz (by placing the keys near the transponder coil
located near the steering column inside the vehicle) which operates at a very short range (< 10cm).
Relay-Station-Attack (RSA) countermeasure: when the Tag ID has been stationary without movement for
a defined time (timer configurable), the motion sensor will deactivate the LF front end in the Tag ID and
will not react to Keyless Entry or Start LF triggers from the vehicle. Only when motion has been detected
by the implemented motion sensor, the LF front end of the Tag ID will become active for a defined time.
2 Operating frequencies of HF transmission
2.1 2-channel
Two channels are implemented on the 434MHz variant (excl. South Korean variant) and on the 315MHz
variant. The following table shows the carrier frequency of the individual channels for each frequency
band.
Frequency Variant
Frequencies
Channel 1 (CH1)
Channel 2 (CH2)
315MHz 314.37MHz 314.97MHz
433.66MHz 434.18MHz
434MHz S. Korea 433.92MHz ---
