That sounds like the multifunction switch is the fault. The flasher on this vehicle is part of the hazzard switch. It recieves power for turn flashing from the turn signal switch. It is very common for the turnsignal (multifunction) switch to become worn and supply partial power to the flasher (hazzard switch) when not on which results in this fast clicking without any lights on. To be certian without taking out any tools whatsoever the next time the clicking happens jiggle the turn signal switch and see if it goes away or changes at all. If it does you need the turn signal switch. I'm going to include replacement instructions for that below because I am confident that is what you will need. Please ask if you have any further questions.
Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.
Disconnect the negative battery cable.
Disable the supplemental inflatable restraints (SIR).
Remove the tilt lever.
Remove the 3 Torx® head screws from the lower column shroud (3).
Remove the upper column shroud (1) tilting up and unsnapping from the lower column shroud hinges (3).
Remove the lower column shroud (3) from the steering column (2).
Remove the Torx® head screws (1) from the multifunction switch (2).
Object Number: 442014 Size: SH
Disconnect the electrical connectors (3) from the multifunction switch (1).
Remove the multifunction switch (1) from the column (2).
Position the multifunction switch (1) on the steering column (2).
Connect the electrical connectors to the multifunction switch (1).
Install the Torx® head screw (1) to the multifunction switch (2).
Tighten the screw to 6 N·m (53 lb in).
Install the lower column shrouds (3) to the steering column (2).
Install the upper column shroud (1) to the steering column (2).
Install the Torx® head screws to the lower steering column shroud (3).
Tighten the screws to 2 N·m (18 lb in).
Install the tilt lever.
Enable the SIR system.
Connect the negative battery cable.
Ensure that the multifunction switch functions properly.