Before carrying out any towing, position the gearbox in neutral position (position N on vehicles equipped with an automatic gearbox), unlock the steering column then release the parking brake.
Steering column unlocking
Insert the key into the ignition, set to ON 2 position or, depending on the vehicle, with the card in the passenger compartment, press the engine start button for approximately two seconds.
Before installing this type of accessory (particularly for transmitters/receivers: frequency bandwidth, power level, position of the aerial, etc.), make sure it is compatible with your vehicle. You can get advice from an authorised dealer.